Research Article |
Corresponding author: Brian J. Armitage ( tobikera89@gmail.com ) Academic editor: Ernesto Rázuri-Gonzales
© 2022 Robin E. Thomson, Brian J. Armitage, Steven C. Harris.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Thomson RE, Armitage BJ, Harris SC (2022) The Trichoptera of Panama. XIX. Additions to and a review of the genus Leucotrichia (Trichoptera, Hydroptilidae) in Panama. In: Pauls SU, Thomson R, Rázuri-Gonzales E (Eds) Special Issue in Honor of Ralph W. Holzenthal for a Lifelong Contribution to Trichoptera Systematics. ZooKeys 1111: 425-466. https://doi.org/10.3897/zookeys.1111.77371
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Prior to 2016, three species of caddisflies in the genus Leucotrichia (Trichoptera: Hydroptilidae) were known from Panama. Subsequently, one new species and four new country records were added to Panama’s fauna. Herein, four new species are described (Leucotrichia cortadera sp. nov., L. holzenthali sp. nov., L. luma sp. nov., L. ruiteri sp. nov.) and two new country records added for Panama (L. botosaneanui Flint, 1996, L. hispida Thomson & Holzenthal, 2015). The resulting total of 14 species makes Panama the most species-rich country for this genus. Panama’s species assemblage is most similar to Costa Rica and Mexico. However, the similarities among faunas in all these countries is very low (< 35%). Thus, more new country records are possible with additional collecting. Recent collections (2015–2021) of new caddisfly species and country records in this genus were effected primarily by use of Malaise traps. Our collections also evidenced multiple species from the same collecting site, with seven species each found in both lowland and mid-altitude sites. Investigation of the distribution of Leucotrichia species with altitude reveals a preference by several species for higher altitude locations. Additional Malaise trap collections over extended time periods are needed to verify the validity of all observations and preliminary conclusions made to date.
Caddisflies, collection methods, Leucotrichiinae, new species, species coexistence
The genus Leucotrichia Mosely, 1934 is in the microcaddisfly family Hydroptilidae and subfamily Leucotrichiinae. Known only in the New World, species of this genus are found throughout the continental United States, Central America, South America, and much of the Caribbean (
The larval stages are dorsoventrally depressed and occupy lotic-erosional habitats. The first four instars are free-living, with these stages completed fairly rapidly (less than two weeks). This is followed by a fifth instar that builds an elliptical, flattened case, usually found firmly affixed to large rocks and boulders (
Leucotrichia viridis Flint, 1967 was the first species of this genus recorded from Panama (
Single, overnight collections were made using UV light traps (
Morphological terminology used for male genitalia generally follows that of
All specimens included in this publication are stored in 80% alcohol. Holotypes of the species described are deposited in the
Universidad de Panamá Museo de Invertebrados (
The distribution of species among the 19 unique locations within Panama wherein the genus Leucotrichia has been collected to date is presented in Table
Species associated with each collected stream. See Fig.
Label | Cuenca | Stream | Species |
---|---|---|---|
1 | 102 | Rio Candela-Finca Felix | Leucotrichia chirquiensis |
Leucotrichia hispida | |||
Leucotrichia ruiteri | |||
2 | 102 | Quebrada Norte | Leucotrichia chirquiensis |
Leucotrichia cultrata | |||
3 | 102 | Afl. Rio Chiriqui Viejo | Leucotrichia hispida |
4 | 102 | Rio Chiriqui Viejo | Leucotrichia hispida |
5 | 106 | Rio Chirigagua | Leucotrichia extraordinaria |
6 | 108 | Quebrada del Guayabo | Leucotrichia hispida |
7 | 108 | Quebrada Grande | Leucotrichia extraordinaria |
Leucotrichia mutica | |||
8 | 108 | Quebrada Jaramillo | Leucotrichia botosaneanui |
Leucotrichia cortadera | |||
Leucotrichia cultrata | |||
Leucotrichia extraordinaria | |||
Leucotrichia melleopicta | |||
Leucotrichia rhomba | |||
Leucotrichia ruiteri | |||
9 | 108 | Rio Majagua | Leucotrichia cortadera |
Leucotrichia cultrata | |||
Leucotrichia extraordinaria | |||
Leucotrichia melleopicta | |||
Leucotrichia rhomba | |||
Leucotrichia viridis | |||
10 | 93 | Quebrada Martinez | Leucotrichia fairchildi |
Leucotrichia melleopicta | |||
Leucotrichia mutica | |||
11 | 93 | Quebrada Rambala | Leucotrichia cultrata |
Leucotrichia extraordinaria | |||
Leucotrichia fairchildi | |||
Leucotrichia melleopicta | |||
Leucotrichia mutica | |||
Leucotrichia rhomba | |||
Leucotrichia viridis | |||
12 | 97 | Rio Llanito | Leucotrichia melleopicta |
13 | 97 | Rio Piedra de Moler | Leucotrichia extraordinaria |
Leucotrichia fairchildi | |||
Leucotrichia holzenthali | |||
Leucotrichia melleopicta | |||
14 | 97 | Rio Calovebora | Leucotrichia cultrata |
Leucotrichia extraordinaria | |||
15 | 97 | afl. Rio Calovebora | Leucotrichia extraordinaria |
Leucotrichia melleopicta | |||
Leucotrichia mutica | |||
16 | 132 | Rio Mulaba, 2do Brazo | Leucotrichia extraordinaria |
Leucotrichia melleopicta | |||
Leucotrichia rhomba | |||
Leucotrichia ruiteri | |||
17 | 132 | Rio Mulaba, afl. 1er Brazo | Leucotrichia cultrata |
Leucotrichia melleopicta | |||
Leucotrichia viridis | |||
18 | 115 | Rio Chileno | Leucotrichia cultrata |
Leucotrichia luma | |||
19 | 138 | Rio Sajalice | Leucotrichia luma |
Cuenca No. | Major River | Drainage Area (km2) | Receiving Body |
---|---|---|---|
93 | Guariviara | 2121 | Caribbean Sea |
97 | Calovébora | 485 | Caribbean Sea |
102 | Chiriqui Viejo | 1376 | Pacific Ocean |
106 | Chico | 593 | Pacific Ocean |
108 | Chiriqui | 1905 | Pacific Ocean |
115 | Chagres | 3338 | Caribbean Sea |
132 | Santa Maria | 3326 | Pacific Ocean |
138 | Chame | 1476 | Pacific Ocean |
In Table
Number of unique streams (max = 19) in which each Leucotrichia species was found.
Species | No. of Streams |
---|---|
Leucotrichia extraordinaria | 9 |
Leucotrichia melleopicta | 9 |
Leucotrichia cultrata | 7 |
Leucotrichia hispida | 4 |
Leucotrichia mutica | 4 |
Leucotrichia rhomba | 4 |
Leucotrichia fairchildi | 3 |
Leucotrichia ruiteri | 3 |
Leucotrichia viridis | 3 |
Leucotrichia chirquiensis | 2 |
Leucotrichia cortadera | 2 |
Leucotrichia luma | 2 |
Leucotrichia botosaneanui | 1 |
Leucotrichia holzenthali | 1 |
Means: | 2.84 species stream-1 |
3.86 streams species-1 |
Species of Leucotrichia which could potentially be found in Panama, based on the current range distributions of its species.
Species | Current distribution |
---|---|
L. melleopicta group | |
Leucotrichia angelinae Thomson & Holzenthal, 2015 | Venezuela |
Leucotrichia ayura Flint, 1991 | Colombia |
Leucotrichia brochophora Flint, 1991 | Colombia |
Leucotrichia denticulata Thomson & Holzenthal, 2015 | Mexico |
Leucotrichia dianeae Thomson & Holzenthal, 2015 | Costa Rica |
Leucotrichia dinamica Bueno-Soria, 2010 | Mexico |
Leucotrichia forrota Oláh & Johanson, 2011 | Ecuador, Peru |
Leucotrichia fulminea Thomson & Holzenthal, 2015 | Ecuador |
Leuoctrichia inflaticornis Botosaneanu, in Botosaneanu and Alkins-Koo 1993 | Trinidad |
Leucotrichia inops Flint, 1991 | Colombia, Ecuador |
Leucotrichia interrupta Flint, 1991 | Colombia |
Leucotrichia kateae Thomson & Holzenthal, 2015 | Venezuela |
Leucotrichia limpia Ross, 1944 | Costa Rica, Mexico, U.S.A. |
Leucotrichia padera Flint, 1991 | Colombia |
Leucotrichia pectinata Thomson & Holzenthal, 2015 | Ecuador |
Leucotrichia repanda Thomson & Holzenthal, 2015 | Venezuela |
Leucotrichia riostoumae Thomson & Holzenthal, 2015 | Ecuador |
Leucotrichia sidneyi Thomson & Holzenthal, 2015 | Venezuela |
Leucotrichia tapantia Thomson & Holzenthal, 2015 | Costa Rica |
Leucotrichia termitiformis Botosaneanu, in Botosaneanu and Alkins-Koo 1993 | Trinidad |
Leucotrichia tritoven Flint, 1996 | Guyana, Tobago, Trinidad, Venzuela |
Leucotrichia zopilote (Holzenthal & Harris, 1999) | Costa Rica |
L. pictipes group | |
Leucotrichia pictipes Banks, 1911 | Mexico, U.S.A. |
Leucotrichia imitator Flint, 1970 | Costa Rica, Guatemala, Mexico |
Leucotrichia sarita Ross, 1944 | Costa Rica, El Salvador, Grenada, Guatemala, Mexico, Nicaragua, U.S.A. |
A perusal of the country distributions in the species accounts given below is not overly informative. Only one species, L. fairchildi, is somewhat widespread. Six species occupy portions of a distributional axis from Mexico southeast to northern South America (Colombia, Venezuela). Two other species have a distribution which involves (L. botosaneanui) or includes (L. fairchildi) Trinidad and Panama, which is orthogonal to this more common northwest/southeast axis. Six Leucotrichia species currently are endemic to Panama, including the four species described herein.
Confining ourselves primarily to countries with four or more species, we calculated similarity values and constructed a cluster diagram to show the relative affinity among seven Latin American countries (Fig.
As expanded upon in the Discussion section, we think it is difficult at the present time to provide a definitive diagnosis for this genus based on adult characters. Leucotrichia is characterized by a prominent row of setae along the posterior margin of segment IX; a ventral process on abdominal segment VII in almost all species; inferior appendages simple, fused or not, bearing a dorsal spine in most species; and the subgenital plate with a ventral arm, accompanied by a dorsal arm in ca. half of the species.
With this equivocal diagnosis, we present fourteen species of Leucotrichia which we have found to date in Panama. Included are four new species to science and two first country records for Panama. Several of the species defined below bear morphological characters which are exceptions to those that served heretofore as diagnostic for this genus.
The plates for three species (L. melleopicta, L. mutica, and L. rhomba) were modified from
General drawings for unmodified Leucotrichia body parts are given in Fig.
This species is similar to L. chiriquiensis, L. hispida Thomson & Holzenthal, 2015, and L. viridis, three species that also occur in Panama. The phallus of all four species has a similar appearance, due to the elongate basal supports of the midlength complex and the small pair of membranous, apical lobes (Fig.
Leucotrichia botosaneanui Flint, 1996. Male genitalia: A segments VII–VIII and segment IX margin, lateral B segments IX–X, lateral (base of phallus crosshatched) C segments IX–X, dorsal D segments VII–IX, ventral E phallus, lateral F phallus, dorsal. Modified from
Panama: Chiriqui Province • 1 male; Cuenca 108; Boquete District; Quebrada Jaramillo; Finca Monterey; 8.7632°N, 82.41383°W; 1,214 m a.s.l.; 19–25 Apr. 2018; K. Collier, leg.; Malaise trap; in alcohol; MUPADI.
Panama, Trinidad, Tobago.
Leucotrichia chiriquiensis is most similar to L. botosaneanui, L. hispida, and L. viridis, based on a similar appearance of the phallus, as discussed under L. botosaneanui. This species can most swiftly be identified as distinct from the others based on the structural modifications of the antennae and head.
Leucotrichia chiriquiensis Flint, 1970. Male genitalia: A segments VII–VIII and segment IX margin, lateral B segments IX–X, lateral (base of phallus crosshatched) C segments IX–X, dorsal D segments VII–IX, ventral E phallus, lateral F phallus, dorsal. Modified from
Panama: Chiriqui Province • 2 males; Cuenca 102; Renacimiento District; La Amistad International Park, Río Candela, Finca Felix, PSPSCB-PILA-C102-2017-021; 8.890557°N, 82.61201°W; 2,128 m a.s.l.; 25 Jan. 2015; C. Nieto, E. Pérez, A. Cornejo, leg.; UV light trap; in alcohol; COZEM • ibid., 2 males; Tierras Altas District; Mount Totumas Cloud Forest and Biological Reserve, Quebrada Norte; 8.873613°N, 82.690512°W; 1,709 m a.s.l.; 26 Apr.–10 May 2015; B. Armitage, T. Arefina-Armitage, leg.; Malaise trap; MUPADI • ibid., 5 males; 28 Jan.–2 Feb. 2018; J. Dietrich, leg.; Malaise trap; MUPADI • ibid., 3 males; 16–20 Feb. 2018; MUPADI • ibid., 1 male; 16–20 Mar. 2018; MUPADI • ibid., 1 male; 10–15 Jul. 2018; MUPADI • ibid., 2 males; 9–12 Sep. 2018; MUPADI • ibid., 2 males; 8–11 Nov. 2018;
Panama.
Panama: Chiriqui Province: Cuenca 108; Boquete District; Quebrada Jaramillo, Finca Monterey; 8.7632°N, 82.41383°W; 1,214 m a.s.l.
Holotype
: male, Panama: Chiriqui Province: Cuenca 108; Boquete District; Quebrada Jaramillo, Finca Monterey; 8.7632°N, 82.41383°W; 1,214 m a.s.l.; 16–20 Jun. 2018, K. Collier, leg.; Malaise trap; in alcohol;
Leucotrichia cortadera sp. nov. is similar to L. fulminea Thomson & Holzenthal, 2015, a species endemic to Ecuador. Both species bear a pair of large, distinct sclerotized plates on the phallus apex. Leucotrichia cortadera can be separated by the small spines present on the dorsolateral surface of the phallus apex, which are absent in L. fulminea. Additionally, the inferior appendages are separate in L. fulminea, while they are fused in L. cortadera.
Male. Length of forewing 2.1 mm (n = 2). Wings unmodified. Head unmodified, with three ocelli; antennae unmodified. Tibial spur count 1, 3, 4. Color in alcohol brown. Genitalia. Abdominal sternum VII mesoventral process with enlarged apex (Fig.
Panama.
The specific epithet is derived from cortadera, Spanish for “knife, cutting instrument”, referring to the shape of the large sclerotized plates found on the phallus apex.
Leucotrichia cultrata is similar to L. hispida and L. viridis. The phallus of all three species shares a similar appearance with the basal loop of the median complex extended on basal supports and a ventral “bulge” to the membranous apex. The mesoventral process of sternum VII can be used to separate the three, being long and digitate in L. cultrata, bearing a tuft of prominent apical setae in L. hispida, and enlarged and apically blunt when viewed ventrally in L. viridis.
Leucotrichia cultrata Thomson & Armitage, 2021. Male genitalia: A segments VII–VIII and segment IX margin, lateral B segments IX–X, lateral (base of phallus crosshatched) C segments IX–X, dorsal D segments VII–IX, ventral E phallus, lateral F phallus, dorsal. Modified from
Panama: Bocas del Toro Province • 2 males; Cuenca 093; Chiriqui Grande District; Quebrada Rambala, Rambala Jungle Lodge, 8.91627°N, 82.15469°W; 120 m a.s.l.; 9 Aug. 2014; E. Carlson, leg.; UV light trap; in alcohol; MUPADI • ibid., 5 males; 28 Mar. 2015 • ibid., 2 males; 31 Mar.–11 Apr. 2015; Malaise trap • ibid., 17 males; 12–15 Nov. 2017. Chiriqui Province • 1 male; Cuenca 102; Tierras Altas District; Mount Totumas Cloud Forest and Biological Reserve, Quebrada Norte; 8.873613°N, 82.690512°W; 1,709 m a.s.l.; 10–15 Jul. 2018; J. Dietrich, leg.; Malaise trap; in alcohol;
Panama.
This species is similar to L. dianeae Thomson & Holzenthal, 2015 and L. tapantia Thomson & Holzenthal, 2015, two species originally described from Costa Rica that could potentially be collected in Panama (Table
Leucotrichia extraordinaria Bueno-Soria, Santiago-Fragoso & Barba-Álvarez, 2001. Male genitalia: A segments VII–VIII and segment IX lateral, lateral B segments IX–X, lateral (base of phallus crosshatched) C segments IX–X, dorsal, D segments VII–IX, ventral E phallus, lateral F phallus, dorsal. Modified from
Panama: Bocas del Toro Province • 59 males; Cuenca 093; Chiriqui Grande District; Quebrada Rambala; Rambala Jungle Lodge; 8.91627°N, 82.15469°W; 120 m a.s.l.; 7–9 Oct. 2016; E. Carlson, leg.; Malaise trap; in alcohol; MUPADI • ibid., 18 males; 15–20 Nov. 2016; MUPADI • ibid., 13 males; 21–31 Dec. 2016; MUPADI; ibid., 6 males; 6–12 Feb. 2017; MUPADI • ibid., 18 males; 12–15 Jun. 2017; MUPADI • ibid. 3 males; 28–30 Jun. 2017; MUPADI. Chiriqui Province • 1 male; Cuenca 108; Boquete District; Quebrada Grande; Valle Escondido; 8.7797°N, 82.44016°W; 1,122 m a.s.l.; 29 Apr.–2 May 2018; B. Armitage, T. Arefina-Armitage, leg.; Malaise trap; in alcohol; MUPADI • ibid., 1 male; Quebrada Jaramillo, Finca Monterey; 8.7632°N, 82.41383°W; 1,214 m a.s.l.; 12–19 Aug. 2018; K. Collier, leg.; Malaise trap; in alcohol;
Mexico, Panama.
This species is similar to L. botosaneanui, L. chiriquiensis, and L. viridis, based on characteristics of the phallus, as discussed under L. botosaneanui. Leucotrichia hispida can be recognized using the tuft of setae on the posteroventral projection of sternum VIII and the lack of any external spines or sclerites on the apex of phallus.
Leucotrichia hispida Thomson & Holzenthal, 2015. Male genitalia: A segments VII–VIII and segment IX margin, lateral B segments IX–X, lateral (base of phallus crosshatched) C segments IX–X, dorsal D segments VII–IX, ventral E phallus, lateral F phallus, dorsal. Modified from
Panama: Chiriqui Province • 1 male; Cuenca 102; Renacimiento District; La Amistad International Park, Río Candela, Finca Felix, PSPSCB-PILA-C102-2017-021; 8.890557°N, 82.61201°W; 1,996 m a.s.l.; 25 Jan. 2015; C. Nieto, E. Pérez, A. Cornejo, leg.; UV light trap; in alcohol; COZEM • ibid., 1 male; Río Chiriqui Viejo, PSPSCB-PNVB-C108-2017-016; 8.87550°N, 82.55336°W; 2,117 m a.s.l.; 5–8 Jun. 2017; E. Álvarez, T. Ríos, E. Pérez, leg.; Malaise trap; COZEM • ibid., 2 males; afl. Río Chiriqui Viejo, PSPSCB-PILA-C102-2017-022; 8.90124°N, 82.61817°W; 2,354 m a.s.l.; 17–21 Jun. 2017;
Costa Rica, Panama.
Panama: Veraguas Province: Cuenca 097; Santa Fe District; Santa Fe National Park; Río Piedra de Moler; PSPSCB-PNSF-C097-2017-011; 8.55343°N, 81.17675°W; 395 m a.s.l.
Holotype
: male, Panama: Veraguas Province: Cuenca 097; Santa Fe District; Santa Fe National Park; Río Piedra de Moler; PSPSCB-PNSF-C097-2017-011; 8.55343°N, 81.17675°W; 395 m a.s.l.; 20 Apr. 2017; A. Cornejo, T. Ríos, E. Álvarez, C. Nieto, leg.; UV light trap; in alcohol;
Leucotrichia holzenthali sp. nov., is similar to L. dinamica Bueno-Soria, 2010, a species currently known only from Mexico. Both species bear a pair of large scissor-like sclerites on the apex of the phallus. Leucotrichia holzenthali can be distinguished by the additional pair of ventral sclerites on the phallus apex and the peg-like setae on abdominal sternum VIII, both characteristics that are absent on L. dinamica.
Male. Length of forewing 1.7 mm (n = 2). Wings unmodified. Head unmodified, with three ocelli; antennae unmodified. Tibial spur count 1, 3, 4. Color in alcohol brown. Genitalia. Abdominal sternum VII mesoventral process with enlarged apex (Fig.
Panama.
Named in honor of Dr. Ralph W. Holzenthal, for a long and robust career in caddisfly taxonomy and systematics. Dr. Holzenthal has been a friend and colleague to each of the authors, and an invaluable mentor in particular to the first author.
Panama: Panama Oeste Province: Cuenca 115; Altos de Campana National Park, Río Chileno, PSPSCB-PNAC-C115-2018-028; 8.716502°N, 80.00740°W; 497 m a.s.l.
Holotype
: male, Panama: Panama Oeste Province • Cuenca 115; Altos de Campana National Park, Río Chileno, PSPSCB-PNAC-C115-2018-028; 8.716502°N, 80.00740°W; 497 m a.s.l.; 27–31 May 2018, T. Ríos, Y. Aguirre, leg.; Malaise trap; in alcohol; COZEM;
Leucotrichia luma is most similar to L. inflaticornis, a species currently known only from Trinidad. Certain characteristics found on the genitalia of these species make them very similar, such as the symmetrical rows of spines on the phallus apex, a unique arrangement within the genus. Key differences, however, make it possible to separate the two. Inflated antennal segments, a key feature of L. inflaticornis, were not observed in any of the specimens collected in Panama and identified as L. luma. Additionally, L. luma specimens all present three pairs of spines on the phallus apex, while the original description of L. inflaticornis states that there should be four. The first author has observed the holotype specimen of L. inflaticornis and found that the abdomen, including the phallus, was missing and key features of the genitalia cannot be confirmed. Since specimens cannot be compared to the L. inflaticornis holotype, we compare these specimens to the original description and illustration and offer this new species description for the specimens from Panama.
Male. Length of forewing 1.8–2.0 mm (n = 17). Wings unmodified. Head unmodified, with 3 ocelli; antennae unmodified. Tibial spur count 1, 3, 4. Color in alcohol brown. Genitalia. Abdominal sternum VII without apparent mesoventral process. Sternum VIII with acute posteroventral production, in ventral view posterior margin concave (Fig.
Panama.
The specific epithet is derived from luma, Latin for “thorn”, referring to the spines found on the phallus apex.
Leucotrichia melleopicta is most similar to L. mutica, also recorded from Panama. These species possess an inferior appendage with a similar shape, and the dorsal sclerite of the phallus of both bears a dorsal sclerite with a distinct apical emargination. Leucotrichia melleopicta can be distinguished by the elongate basal sclerite of the phallus and the poorly developed basal loop (Fig.
Panama: Bocas del Toro Province • 6 males; Cuenca 093; Chiriqui Grande District; Quebrada Rambala; Rambala Jungle Lodge; 8.91627°N, 82.15469°W; 120 m a.s.l.; 28 Mar. 2015; B. Armitage, T. Arefina- Armitage, leg.; UV light trap; in alcohol; MUPADI • ibid., 68 males; 31 Mar.–11 Apr. 2015; E. Carlson, leg.; Malaise trap • ibid., 38 males; 7–9 Oct. 2016 • ibid., 36 males; 15–20 Nov. 2016 • ibid., 66 males; 21–31 Dec. 2016 • ibid., 55 males; 6–12 Feb. 2017 • ibid., 32 males; 12–15 Jun. 2017 • ibid., 17 males; 28–20 Jun. 2017. Comarca Ngäbe Buglé • 1 male; Cuenca 093; Palo Seco Forest Preserve; Quebrada Martinez; Alto de Valle, detrás de las caseta de MiAmbiente; 8.79484°N, 82.19047°W; 480 m a.s.l.; 5–19 May 2019; T. Ríos, Y. Aguirre, leg.; Malaise trap; in alcohol; MUPADI • ibid., 4 males; 24 May–6 Jun. 2019 • ibid., 5 males; 22 Sep.–11 Oct. 2019 • ibid., 2 males; Willie Mazu, 8.79361°N, 82.19391°W, 538 m a.s.l.; 13–27 Sep. 2019 • ibid., 1 male; 11–30 Oct. 2019. Chiriqui Province • 27 males; Cuenca 108, Boquete District; Quebrada Jaramillo; Finca Monterey; 8.7632°N, 82.41383°W; 1,214 m a.s.l.; 19–25 Apr. 2018, K. Collier, leg.; Malaise trap; in alcohol; MUPADI • ibid., 41 males; 8–12 May 2018 • ibid., 54 males; 16–20 Jun. 2018 • ibid., 5 males; 12–19 Aug. 2018 • ibid., 52 males; 14–22 Oct. 2018 • ibid., 6 males; 15–22 Nov. 2018 • ibid., 48 males; Dolega District, Río Majagua, Potrerillos, Banquito de Palmira; 8.68083°N, 82.532528°W; 840 m a.s.l.; 28 Feb–14 Mar. 2019; T. Ríos, Y. Aguirre, leg.; Malaise trap; in alcohol;
Mexico, Panama, Venezuela.
In the paper
This species is similar to L. melleopicta; both species display ranges that include Panama. As discussed under L. melleopicta, these species share similarities in the dorsal sclerite of the phallus apex, although this sclerite is much smaller than that seen in L. melleopicta (Fig.
Panama: Bocas del Toro Province • 17 males; Cuenca 093; Chiriqui Grande District; Quebrada Rambala; Rambala Jungle Lodge; 8.91627°N, 82.15469°W; 120 m a.s.l.; 7–9 Oct. 2016; E. Carlson, leg.; Malaise trap; in alcohol; MUPADI • ibid., 10 males; 15–20 Nov. 2016 • ibid., 6 males; 21–31 Dec. 2016 • ibid., 6 males; 6–12 Feb. 2017 • ibid., 14 males; 12–15 Jun. 2017 • ibid., 47 males; 28–30 Jun. 2017. Comarca Ngäbe Buglé • 1 male; Quebrada Martinez, Bosque Protector Palo Seco, Alto de Valle; detrás de las caseta de MiAmbiente, M0002; 8.79424°N, 82.1904724°W; 480 m a.s.l.; 24 May–6 Jun. 2018; Y. Aguirre, T. Ríos, leg.; Malaise trap; in alcohol; MUPADI. Chiriqui Province • 1 male; Cuenca 108; Boquete District; Quebrada Grande; Valle Escondido; 8.7797°N, 82.44016°W; 1,122 m a.s.l.; 11 Mar. 2018; T. Arefina-Armitage, leg.; UV light trap • 6 males; 29 Apr.–2 May 2018; Malaise trap • ibid., 1 male; 21 May 2018; UV light trap • ibid., 1 male; 8.783645°N, 82.444287°W; 1,147 m a.s.l.; 27–30 May 2018; Malaise trap • ibid., 1 male; 17–20 Jun. 2018 • 6 males; 23 Jul. 2018; UV light trap • ibid., 2 males; 10 Nov. 2018. Veraguas Province • 1 male; Cuenca 097; Santa Fe District; Santa Fe National Park; afl. Río Calovébora; PSPSCB-NPSF-C-097-2017-005; 8.54318°N, 81.16398°W; 515 m a.s.l.; 19–23 Apr. 2017; Malaise trap; in alcohol; COZEM.
Colombia, Panama.
Leucotrichia mutica in
Leucotrichia rhomba is similar to L. brochophora Flint, 1991 and L. padera Flint, 1991, two species recorded from Colombia, but not currently known from Panama. All three species share a similar appearance of the phallus apex, with no spines and either few or no externally sclerotized structures. The anterolateral margin of segment IX is also produced in all three species. Leucotrichia rhomba can be recognized by the elongate mesoventral process of segment VII, which is enlarged, rhomboid, and rugose in ventral view (Fig.
Panama: Bocas del Toro Province • 6 males; Cuenca 093; Chiriqui Grande District; Quebrada Rambala; Rambala Jungle Lodge; 8.91627°N, 82.15469°W; 120 m a.s.l.; 12–15 Jun. 2017; E. Carlson, leg.; Malaise trap; in alcohol; MUPADI • ibid., 1 male; 28–30 Jun. 2017 • ibid., 2 males; 15–20 Nov. 2016. Chiriqui Province • 5 males; Cuenca 108; Boquete District; Quebrada Jaramillo; Finca Monterey; 8.7632°N, 82.41383°W; 1,214 m a.s.l.; 16–20 Jun. 2017; K. Collier, leg.; Malaise trap • ibid., 1 male; 14–22 Oct. 2018. • ibid., 5 males; Dolega District, Río Majagua, Potrerillos, Banquito de Palmira; 8.68083°N, 82.532528°W; 840 m a.s.l.; 28 Feb.–14 Mar. 2019; T. Ríos, Y. Aguirre, leg.; MUPADI. Veraguas Province • 14 males; Cuenca 132; Santa Fe District, Santa Fe National Park, Río Mulaba, 2do Brazo, PSPSCB-NPSF-C-097-2017-007; 8.52577°N, 81.13045°W; 623 m a.s.l.; 19–23 Apr. 2017; A. Cornejo, T. Ríos, E. Álvarez, C. Nieto, leg.; Malaise trap; in alcohol; COZEM.
Costa Rica, Panama.
The drawings of Leucotrichia rhomba in
Panama: Chiriqui Province: Cuenca 108; Boquete District; Quebrada Jaramillo, Finca Monterey; 8.7632°N, 82.41383°W; 1,214 m a.s.l.
Holotype
: male, Panama: Chiriqui Province: Cuenca 108; Boquete District; Quebrada Jaramillo, Finca Monterey; 8.7632°N, 82.41383°W; 1,214 m a.s.l.; 8–12 Jun. 2018, K. Collier, leg.; Malaise trap; in alcohol;
Panama: Chiriqui Province • 1 male; Cuenca 102, Renacimiento District; La Amistad International Park, Río Candela, Finca Felix, PSPSCB-PILA-C102-2017-021; 8.90614°N, 82.72882°W; 1,799 m a.s.l., 1–5 Sep. 2017; E. Álvarez, T. Ríos, E. Pérez, leg.; Malaise trap; in alcohol; COZEM. Veraguas Province • 1 male; Cuenca 132, Santa Fe National Park, Río Mulaba, 2do Brazo, PSPSCB-NPSF-C-097-2017-007; 8.52577°N, 81.13045°W; 623 m a.s.l.; 19–23 Apr. 2017; A. Cornejo, T. Ríos, E. Álvarez, C. Nieto, leg.; Malaise trap; in alcohol; MUPADI.
Leucotrichia ruiteri sp. nov. is most similar to L. hispida, as both species bear prominent setae on the posteroventral production of sternum VIII, a bilobed phallus apex, and a similar shaped inferior appendage. Leucotrichia ruiteri can be separated by the single, elongate seta on sternum VIII compared to the cluster of setae present on L. hispida. Additionally, the forewings of L. ruiteri are modified with a large setae-filled pocket, while those of L. hispida are unmodified.
Male. Length of forewing 2.0–2.1 mm (n = 4). Forewing with large pocket filled with scales (Fig.
Panama.
This species is named in honor and memory of Dave Ruiter, a passionate and enthusiastic caddisfly researcher and good friend, who recently passed away.
Due to the similar overall appearance of the phallus, L. viridis is most similar to L. botosaneanui, L. hispida, and L. chiriquiensis, as discussed under L. botosaneanui. Leucotrichia viridis has two dorsal spines on the inferior appendage, while the other species each bear only a single spine.
Leucotrichia viridis Flint, 1967. Male genitalia: A segments VII–VIII and segment IX margin, lateral B segments IX–X, lateral (base of phallus crosshatched) C segments IX–X, dorsal D segments VII–IX, ventral E phallus, lateral F phallus, dorsal. Modified from
Panama: Bocas del Toro Province • 21 males; Cuenca 093, Chiriqui Grande District, Quebrada Rambala, Rambala Jungle Lodge; 8.91627°N, 82.15469°W; 120 m a.s.l.; 9 Aug. 2014; E. Carlson, leg.; Malaise trap; in alcohol; MUPADI • ibid., 3 males; 28 Mar. 2015; UV light trap • ibid., 3 males; 31 Mar.–11 Apr. 2015; Malaise trap. Chiriqui Province • 1 male; Cuenca 108; Dolega District; Río Majagua; Potrerillos, Banquito de Palmira; 8.68083°N, 82.53253°W; 840 m a.s.l.; 28 Feb.–14 Mar. 2019; T. Ríos, Y. Aguirre, leg.; Malaise trap; in alcohol; MUPADI. –Veraguas Province • 3 males; Cuenca 132; Santa Fe District, Santa Fe National Park, Río Mulaba, afl. 1er Brazo; PSPSCB-NPSF-C-097-2017-008; 8.51706°N, 81.1214°W; 770 m a.s.l.; E. Álvarez, E. Pérez, T. Ríos, leg.; 19–23 Apr. 2017; in alcohol; COZEM.
El Salvador, Guatemala, Mexico, Panama.
Leucotrichia fairchildi is currently the only member of the L. pictipes Group recorded in Panama. Leucotrichia pictipes known distribution includes Mexico, while L. imitator Flint, 1970 and L. sarita Ross, 1944 have been recorded in nearby Costa Rica. All species in this group bear only two ocelli and share similar shapes to the inferior appendage and sternum VII, when viewed laterally. The modified basal antennal segments and setiferous production on the dorsum of the head can be used to easily separate L. fairchildi from each of the three other species.
Leucotrichia fairchildi Flint, 1970. Male genitalia: A segments VII–VIII and segment IX margin, lateral B segments IX–X, lateral (base of phallus crosshatched) C segments IX–X, dorsal D segments VII–IX, ventral E phallus, lateral F phallus, dorsal. Modified from
Panama: Bocas del Toro Province • 16 males; Cuenca 093; Chiriqui Grande District; Quebrada Rambala; Rambala Jungle Lodge; 8.91627°N, 82.15469°W; 120 m a.s.l.; 21–31 Dec. 2016; E. Carlson, leg.; Malaise trap; in alcohol; MUPADI • ibid., 3 males; 6–12 Feb. 2017 • ibid., 1 male; 12–15 Jun. 2017 • 2 males; 28–30 Jun. 2017. Comarca Ngäbe Buglé • 3 males; Quebrada Martinez, Bosque Protector Palo Seco, Alto de Valle, detrás de las caseta de MiAmbiente; 8.79484°N, 82.19391°W, 480 m a.s.l.; 16–30 Aug. 2019; Y. Aguirre, T. Ríos, leg.; Malaise trap; in alcohol; MUPADI • ibid., 2 males; 30 Aug.–13 Sep. 2019 • ibid., 2 males; 13–27 Sep. 2019. Veraguas Province • 1 male; Cuenca 097; Santa Fe District; Santa Fe National Park; Río Piedra de Moler; PSPSCB-NPSF-C-097-2017-011; 8.55343°N, 81.17675°W; 395 m a.s.l.; 20 Apr. 2017; T. Ríos, E. Álvarez, C. Nieto, leg.; UV light trap; in alcohol; COZEM.
Colombia, Costa Rica, Ecuador, El Salvador, Grenada, Panama, Tobago, Trinidad, Venezuela.
A pharate female in a pupal case was identified by Botosaneanu and Alkins-Koo (1993) as “Leucotrichiini—case 2”. Subsequently, Flint (1996) associated this female with L. fairchildi, in addition to collecting adult material from Trinidad and Venezuela.
The colloquial expression “I know it when I see it” was coined in 1964 by United States Supreme Court Justice Potter Stewart to describe his threshold test for obscenity in Jacobellis v. Ohio. As stated in the Results section, a definitive diagnosis for adults of the genus Leucotrichia is difficult at this time and could only be objectively based on one or perhaps two characters. But, subjectively it is more easily perceived. And, to support this perception, this position is confirmed by molecular analyses (
Locations of collection sites for Leucotrichia in Panama, sorted and displayed by longitude, then latitude A map of Panama showing collection locations B enlarged map of western Panama showing locations 1–11 C map of the Santa Fe National Park locations12–17 D map of the Altos de Campana National Park locations 18 and 19. Please refer to Tables
In the course of our studies in Panama, we have added to the confusion by finding several species which are “exceptions to the rule” for characters which normally would be included in a diagnosis for the genus. For example, unmodified wings were a consistent, albeit unremarkable, character for this genus, until we described L. ruiteri in this paper. This new species has a forewing which bears a pocket filled with scales.
Another, formerly reliable character typical of Leucotrichia is the subgenital plate with dorsal and ventral arms. However, a survey of the genus shows that only 21 species (e.g., the Panamanian species L. botosaneanui) have both arms on the subgenital plate. A total of 21 other species (e.g., the Panamanian species L. melleopicta) lacks the dorsal arm. And, four species (L. adela, L. inflaticornis, L. laposka Oláh & Johanson, 2011, L. tubifex Flint, 1964) are undetermined at this time.
Other characters which could have been used in a diagnosis vary by number or presence. For example, two ocelli are characteristic of the L. pictipes group and three ocelli are found in all members of the L. melleopicta Group. Inferior appendage segments are fused in 15 species (e.g., the Panamanian species, L. rhomba), with separate segments in 29 species (e.g., the Panamanian species L. chiriquiensis), and undetermined in two species (L. adela, L. alisensis Rueda Martín, 2011). There is a dorsal spine on the inferior appendage in 35 species (e.g., L. melleopicta), it is lacking in ten species (e.g., L. inops Flint, 1991), and is undetermined in one species (L. adela). Forty-one species have a ventral process on abdominal segment VII (prominent in 33 species, e.g., L. melleopicta; reduced in eight species, e.g., L. botosaneanui), and six species have no ventral process.
Finally, there are other characters, like the unmodified wings mentioned above, which seem consistent within Leucotrichia, but are shared with other genera. An example of this is the median complex on the phallus bearing sclerotized armature, which is also found in Zumatrichia and other members of the Leucotrichiinae.
Of course, the variability that we find within this genus is also common in other genera of insects. However, usually there is a core of morphological characters which consistently define those genera. Even so, in
When we first started examining the extent of the hydroptilid fauna of Panama in 2015, we were naively comfortable with the three taxa representing the genus Leucotrichia. Two of them (L. chiriquiensis and L. fairchildi) had been described from this country, and the thought that many more were undetected seemed remote. This presumption was supported by recent papers based on two doctoral studies involving this genus (
The 14 species of this genus in Panama is currently the most for any Latin American country. Impressive as that total is, we must dampen our enthusiasm in at least two regards. Latin America as a whole is considerably under-collected for adult caddisflies. Whereas a number of countries have a published species list (e.g.,
It is not uncommon to find multiple congeners of many caddisfly genera in the same stream location. Intuitively, there are sufficient resources available to mitigate any possible competition or cropping by predators to keep population levels relatively low. Thus, the competitive exclusion priniciple (aka Gause’s Law;
There are a number of problems when evaluating the distribution of any group of aquatic insects in relation to altitude. Inadequate and infrequent sampling at representative altitudes, rarely captured or undetected species, low or high altitude outliers caused by meteorological events, differences in stream velocity and riparian corridor composition, and meteorological conditions during sampling are but a few (
Distribution of Leucotrichia species with altitude in Panama, sorted from left to right by mean values. The number of unique streams involved in plotting each species is found in parentheses following each species name. Mean values for each species distribution range are indicated by a red circle. The species name labels orthogonal to the X-axis are not italicized to facilitate readability.
Endemics aside, the current, typical distribution pattern among caddisflies in the northern Neotropics follows a NW to SE axis from Mexico down to Panama, with disjuncts to the north (nearctic North America) and to the south (northern South America). Most of the species of Leucotrichia in Panama follow this track. However, there are two species of Leucotrichia and roughly two dozen Panamanian caddisfly species which share the Trinidad to Panama connection mentioned in the Results section. To our knowledge, few other northern South American countries between Trinidad and Panama also host these species. We have speculated in the past that the higher velocity trade winds during the dry season (December through April) moving from northern South America west, toward and across Panama, might be involved in this disjunct distribution (
Leucotrichia species have been found in 22 continental and island countries in Latin America, including the Caribbean Region (
An interesting historical aspect of this puzzling genus involves its ancestral home or point of origin and the genesis of its current assemblage of species. If we accept the work of
The composition and structure of the cluster diagram in Fig.
First, we would like to acknowledge the impact of Dr. Ralph Holzenthal on each of the authors at both a personal and professional level. His friendship, encouragement, and leadership involving the study of our favorite order of insects has never wavered. We are most appreciative of the permissions, collections, and logistical support of Jeffrey Dietrich of the Mount Totumas Cloud Forest and Biological Reserve; Eric Carlson of Rambala Jungle Lodge; and Kelly Collier of Finca Monterey. Some of the specimen records included herein were acquired through the Sustainable Production System and Biodiversity Conservation Project (PSPSCB), conducted in a variety of Panamanian national parks and protected areas. We acknowledge the Panamanian Ministry of Environment, which managed this project with funding from the World Bank, and who provided collecting permits and other support. We thank Tomás A. Ríos González, Eric Álvarez, Edgar Pérez, Yusseff Aguirre, Carols Nieto, and Aydeé Cornejo who collectively made all of the national parks collections. We also appreciate the organizational and logistical support by the Gorgas Institute and COZEM concerning this project. We are indebted to Albert Thurman for his logistical support and friendship. We appreciate the efforts of Tatiana I. Arefina-Armitage in editing the manuscript and field collecting. Finally, we thank the reviewers for evaluating and improving this manuscript. The work involved in generating the results found in this report and the production of the manuscript itself was made possible thanks to support to the corresponding author (BJA) by the Sistema Nacional de Investigación (SNI) of the Secretaria Nacional de Ciencia, Tecnología e Innovación (SENACYT), Panama.