Research Article |
Corresponding author: Ralph W. Holzenthal ( holze001@umn.edu ) Academic editor: Ana Previšić
© 2022 Ralph W. Holzenthal, Roger J. Blahnik, Blanca Ríos-Touma.
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:
Holzenthal RW, Blahnik RJ, Ríos-Touma B (2022) A new genus and new species of Ecuadorian Philopotamidae (Trichoptera). ZooKeys 1117: 95-122. https://doi.org/10.3897/zookeys.1117.86984
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A new genus and species of Philopotamidae (Trichoptera), Sumacodella elongata, is described from the southern slope of Volcán Sumaco in Ecuador. This new genus differs from other philopotamid genera by having very elongate, narrow anterolateral apodemes on segment IX and the inferior appendages, a very elongate and narrow tergum X, and a very elongate, tubular phallus. In addition, two new species of Wormaldia are also described and illustrated from Sumaco as well as three new Chimarra (Chimarra), one new Chimarra (Curgia), and one new Chimarra (Otarrha) from the eastern and western slopes of the Ecuadorian Andes.
Andes, biodiversity, caddisflies, Neotropics, South America
The caddisfly family Philopotamidae occurs around the world and currently contains approximately 1400 species, most of these in tropical regions. This is especially true for the Neotropics, where ~ 400 species occur across the region and where many new species have been described (
Volcán Sumaco is a 3830-m high, potentially active stratovolcano separated to the east from the principal volcanic belt of Ecuador. It is also geologically distinct from the main Ecuadorian volcanic belt in being composed largely of alkaline tephritic, basanitic, and phonolitic lavas (IGEPN 2022). The nearly symmetrical cone-shaped volcano is the dominant geological feature of Parque Nacional Sumaco Napo-Galeras and is generally surrounded by pristine, primary forest (Fig.
Adult specimens of the new genus and new species were collected at UV fluorescent lights placed adjacent to streams. Lights were hung in front of a white bed sheet or placed over a white plastic pan containing 96% ethanol and powered by a small 12 V, sealed, lead-acid battery or a USB power pack (Fig.
Male genitalia were soaked in 85% lactic acid heated to 125 °C for 20–40 min to dissolve internal soft tissues. An Olympus BX41 compound microscope outfitted with a drawing tube was used to examine specimens and to aid the rendering of detailed pencil drawings of genitalic structures. Pencil sketches were scanned and placed in Adobe Illustrator (Creative Cloud version) to serve as a template for vector illustrations. Morphological terminology follows that of
Types of the new species are deposited in the University of Minnesota Insect Collection, St. Paul, Minnesota, USA (
Sumacodella elongata sp. nov., original designation.
Holotype. Male (pinned). Ecuador: Napo: Wildsumaco Lodge, small stream, Coati Trail @ wooden bridge, 0.67433°S, 77.60260°W, 1420 m a.s.l., 10.iii.2020, Ríos, Holzenthal, Frandsen, Pauls, Amigo, UMSP000500637 (
This new species is not easily placed in any established genus of Philopotaminae and consequently we are placing it in a new genus. Like other taxa that
Characters of Sumacodella that can generally be regarded as plesiomorphic for Philopotaminae, as indicated by
Adult. Forewing length male 5.0–5.7 mm (n = 4); female 5.9 mm (n = 1). Head short, rounded; postocular parietal sclerite less than half diameter of eye. Overall color dark brown, including palps and antennae; head and base of forewing with longer, light brown setae, femora slightly paler, antennae with narrow annulations at intersection of segments, chord of forewing only indistinctly evident. Wings both relatively broad and rounded apically. Forewing with forks I, II, III, IV, and V; with chord nearly linear and hyaline (lacking pigmentation), anal loops of forewing with both 2A and 3A intersecting 1A in basal half of vein, 3A nearly convergent with 2A. Hind wing with forks I, II, and V, with all three anal veins reaching wing margin. Spur formula 2:4:4, spurs of foretibiae both short, outer spurs of mesotibiae slightly greater than half length of inner spurs, spurs of metatibia both elongate, outer spurs slightly shorter. Foretarsi of males unmodified, narrow.
Male. Segment VIII moderately elongate, sternum and tergum subequal in length, sternum densely covered with short, fine setae, tergum with setae confined to posterior region of segment, posterodorsally with pair of desclerotized patches with several more elongate setae (characteristic of most species in subfamily Philopotaminae). Segment IX, in lateral view, synscleritous, elongate, strongly tapering, with pair of very elongate apodemes on anterolateral margin at ca. mid-height, ventral margin strongly produced posteriorly, subtruncate as viewed dorsally or ventrally, posterior margin very obliquely narrowed dorsally, with lateral margin converging from ca. mid-height to anterior margin; as viewed dorsally, with posterior margin forming V-shaped convergence at anterior margin. Tergum X very elongate, narrow, and parallel-sided, weakly arched as viewed laterally, base distinctly narrowed at mesal juncture of anterior and posterior margins of segment IX, forming short tab-like projection; in apical 3rd or 4th forming elongate, narrow mesal lobe, bordered by pair of elongate, narrow lateral lobes, slightly shorter than mesal lobe; mesal lobe densely covered with sensilla, basally with pair of short, stalked projections at juncture with lateral lobes, each with one or two short terminal setae. Preanal appendage elongate, narrow, proximate basally, at juncture of tergum X and anterior and posterior convergence of dorsal margins of segment IX, appendage very narrow basally, gradually widening apically. Inferior appendage bi-segmented, segments subequal in length, nearly uniform in width; apical segment rounded, with dense pad of short, stiff apical spines, somewhat extended anteriorly on ventromesal surface. Phallus very elongate, narrow, tubular, without basodorsal projection; internally with several patches of fine, nail-like spines, varying in length, apical patch (in incompletely everted endotheca) preceded by two more elongate spines. Phallotremal sclerite very indistinct, weakly sclerotized, small, and ring-like.
Female. Genitalia very elongate, tapering from segment VII. Segment VII elongate, sternum covered with fine setae; tergum with setae confined to posterior half. Segment VIII with tergum and sternum not fused, shorter than segment VII, relatively undifferentiated in structure and shape, together forming narrow tube; sternum with very elongate, narrow apodemes from dorsolateral margins, at ca. mid-length, extending to ca. mid-length of segment VII. Segment IX shorter and somewhat narrower than segment VIII, sternum and tergum apparently divided, at least anteriorly, segment with very elongate, narrow apodemes, extending to ca. base of segment VIII. Segment X composed of pair of elongate, bulbous lobes, each lobe with short setae basally, apically with numerous sensilla and small, digitate cercus.
The genus is named Sumacodella, feminine, for Volcán Sumaco, an isolated stratovolcano located in the Ecuadorian Amazon, which hosts an amazingly high diversity of endemic plants and animals. The termination -della is intended to make the name euphonious with Chimarrhodella, Hydrobiosella, and Aymaradella, other philopotamids known from the Neotropics. The specific epithet is from the Latin elongatus, meaning elongated and referring to the several elongate appendages and other structures of the male genitalia, which are very diagnostic for this new species.
Holotype. Male (pinned). Ecuador: Morona-Santiago: Macas, small gravel stream (Wallace/Real property), 2.20299°S, 78.08539°W, 1076 m a.s.l., 14.xi.2015, Ríos-Touma, Thomson, Amigo, Real-Wallace, UMSP000357522 (
Chimarra asterae is a member of the Chimarra (Chimarra) bidens group of
Chimarra (Chimarra) asterae sp. nov. Male genitalia A segments IX, X, lateral B segments IX, X, dorsal C inferior appendages, oblique lateral D inferior appendage, ventral E inferior appendage, dorsal F phallus, lateral G inferior appendage, C. duckworthi, lateral (for comparison) H inferior appendage, C. duckworthi, ventral (for comparison).
The female genitalia of C. asterae resemble C. duckworthi in having both a dorsal and paired ventral sclerites near the posterior opening of the vaginal apparatus, as well as distinct, membranous pocket-like lobes (probably receptacles for the inferior appendages of the male) associated with the ventral sclerites of segment IX (Fig.
Adult. Forewing length male 4.8–5.4 mm (n = 5); female 5.4–6.0 mm (n = 5). Color nearly uniformly brownish black (fuscous), except femora slightly paler. Head relatively short and rounded, (postocular parietal sclerite ca. half diameter of eye). Third segment of maxillary much longer than second, subequal to 5th. Male protarsal claws enlarged, asymmetrical in size and shape, outer claw longer and twisted.
Male. Abdominal segment IX, in lateral view, with very pronounced sinuous extension of anteroventral margin and small apodemes from anterodorsal margin; Posteroventral process very narrow, length greater than width, subacute apically. Tergum X membranous mesally, with sclerotized lateral lobes, each bearing pair of sensilla on short, rounded protuberance near dorsal margin in basal half, apex of lobe somewhat mesally cupped and bluntly rounded. Preanal appendage short, rounded, knob-like. Inferior appendage, in lateral view, relatively elongate (similar in length to C. duckworthi, shorter than C. caribea), mesally curved, with apical rotation, apices apposed, chisel-like, basoventral margin of appendage more broadly rounded than in C. duckworthi, apex of inferior appendage somewhat enlarged, with small tooth-like projection near apex on ventromesal margin. Phallobase with very distinct, acute apicoventral projection, two phallic spines, moderately elongate, differing slightly in length, endotheca tubular, more-or-less covered with small echinate spines, apicoventrally with curled sclerite and associated tract of very small spines. Phallotremal sclerite complex composed of elongate rod and ring structure and membranous structure with pair of associated wishbone-like sclerites apically.
Female. Ventral sclerites of sternum IX with prominent membranous lateral pouches (probably “clasper receptacles” of Blahnik, 1998). Vaginal apparatus moderately elongated with distinct rounded dorsal and paired ventral sclerites apically, ventrally with paired, narrow, furrow-like sclerites, beginning at mid-length, proximate posteriorly and diverging anteriorly; lateral margins of vaginal tract with elongate, narrow sclerites; vaginal tract narrowed anteriorly, with declivous, cup-like sclerite.
This new species is named in honor of Aster Real-Wallace, a young nature enthusiast and member of the Real-Wallace family, owners and protectors of a beautiful patch of remnant Amazonian pre-montane riverine forest on a tributary of the Río Upano, where this species was discovered.
Holotype. Male (pinned). Ecuador: Pichincha: Quebrada Laguna, in Mashpi Lodge, 00.16693°N, 078.87122°W, 1111 m a.s.l., 23.vii.2015, Rázuri, Morabowen, Hernández, UMSP000380186 (
Chimarra mashpi is a distinctive species in the Chimarra (Chimarra) ortiziana group of
Adult. Forewing length 4.7 mm (n = 1). Color nearly uniformly brownish black (fuscous), except femora yellowish brown and head somewhat darker, with scattered whitish setae on vertex and anteromesal setal wart. Postocular parietal sclerite relatively short (less than half diameter of eye). Third segment of maxillary palp much longer than 2nd, subequal to 5th. Male protarsal claws enlarged, asymmetrical in size and shape, outer claw longer and twisted.
Male. Abdominal segment IX, in lateral view, with very pronounced sinuous extension of anteroventral margin and small apodemes from anterodorsal margin; posteroventral process moderately elongate, subacute apically. Tergum X membranous mesally, with sclerotized lateral lobes, each bearing pair of sensilla on subtriangular basolateral projection, apex of lobe with short, blunt projection. Preanal appendage short, rounded, knob-like. Inferior appendage, in lateral view, with relatively short and broad, apically rounded, dorsal process, ~ 2 × width of basal part of appendage, extending nearly straight on dorsal margin; as viewed ventrally or caudally, with dorsal process strongly and very angularly mesally flexed. Phallic apparatus with ventral margin of phallobase only weakly projecting; two phallic spines, subequal, moderately elongate; endotheca textured with small spines, also with sclerotic region with array of short spines and two more elongate spines. Phallotremal sclerite complex composed of elongate rod and ring structure and membranous structure with pair of associated wishbone-like sclerites apically.
Female. Unknown.
This new species is named for Mashpi Reserve, where this species was discovered, as a recognition of efforts to preserve the highly threatened Choco-Andean Tropical Forest.
The streams of the Amagusa and Mashpi Reserves at this elevation (1100–1200 m a.s.l.) have higher flows between February and April. These highly forested streams are usually step-pool channels, with average flows ranging between 0.049–0.056 m3/s. Conductivity is low, ranging from 35–88 µS/cm, oxygen is close to 100% saturation, and daytime water temperature ranges from 17–20 °C.
Holotype. Male (pinned). Ecuador: Pichincha: San José de Mashpi, Río Mashpi, 0.18954°N, 78.92117°W, 498 m a.s.l., 8.iii.2020, Ríos, Holzenthal, Frandsen, Amigo, UMSP000500813 (
Chimarra pacifica is a new species in the Chimarra (Chimarra) beameri group of
Adult. Forewing length male 4.0–4.3 mm (n = 2). Color nearly uniformly brownish black (fuscous), except femora yellowish brown and head somewhat darker, with scattered whitish setae on vertex and anteromesal setal wart. Head relatively short and rounded, postocular parietal sclerite short (less than half diameter of eye). Second segment of maxillary palp stout and elongate, subequal to 3rd, with stout apicomesal bristles, 5th segment shorter than 3rd. Male protarsal claws enlarged, asymmetrical in size and shape, outer claw longer and twisted.
Male. Abdominal segment IX, in lateral view, with well-developed anterodorsal apodemes, anteroventral margin distinctly extended, nearly linearly narrowing to dorsal apodemes, posterior margin weakly convex. Posteroventral process subtriangular, very large and prominent, length subequal to width at base. Tergum X membranous mesally, with sclerotized lateral lobes; lateral lobes, as viewed dorsally, spatulate in apical half, with two widely spaced sensilla near dorsal margin; as viewed laterally, turned down, with lateral crease in apical half. Preanal appendage short, rounded, knob-like, somewhat flattened as viewed dorsally. Inferior appendage, in lateral view, with rounded basal part and relatively narrow, moderately elongate; basal expansion weakly rounded to subtruncate, dorsal lobe with small tooth-like projection apicoventrally. Phallobase tubular, with basodorsal expansion, apicoventral margin only weakly projecting, two phallic spines, moderately elongate, subequal in length, endotheca apparently elongate, with small echinate spines. Phallotremal sclerite complex composed of rod and ring structure, rod short and curved and ring with prominent apicodorsal extension; apically with membranous structure subtending rod, anterior margin forming pair of weakly sclerotized, fishhook-like sclerites.
Female. Unknown.
This new species is named “pacifica,” referring to the localities where the species was collected, both on the Pacific slope of the Ecuadorian Andes.
Río Mashpi is a clear water river with base flow ~ 4 m3/s and with peak flows between March to May. Conductivity is low, ranging from 46–58.5 µS/cm, oxygen is close to 100% saturation, and daytime water temperature ranges from 20–23 °C year-round.
Holotype. Male (pinned). Ecuador: Carchi: small stream 1, road from Chilmá Bajo to Moldanado, 0.90574°N, 78.21870°W, 1669 m a.s.l., 15.ii.2017, Ríos-Touma, Holzenthal, Amigo, Huisman, UMSP000378196 (
Chimarra amigo has a general similarity to other species of the Chimarra (Curgia) fernandezi group of Flint (1998). The group is characterized by the form of tergum X, with the dorsomesal part forming a projecting lobe, either entire or slightly notched apically, and with projecting ventrolateral lobes on either side, and particularly by having an enlarged and distinctly sclerotized phallotremal sclerite complex, varying in shape and complexity among the different species of the group. Chimarra amigo differs from other described species of the group by having the preanal appendages flattened and almost completely fused (Fig.
Adult. Forewing length male 5.8–6.5 mm (n = 4); female 6.8 mm (n = 1). Head setae brownish black, slightly darker than wings. Wings brownish black, chord hyaline, distinct. Appendages dark brown. Pretarsal claws of male foreleg unmodified.
Male. Tergum VIII longer than sternum; dorsomesal margin projecting, entire; sternum VIII short ventrally, widening dorsally. Segment IX short dorsally, long ventrally, subtriangular in lateral view; anterolateral margin slightly concave, ventral margin produced; posterolateral margin angularly produced at level of inferior appendage; ventral process long, narrow, projecting, subacute apically; anteroventral margin concave mesally; dorsomesal margin broadly concave. Preanal appendage completely fused to tergum X represented by elevated patch of setae. Tergum X moderately long; divided into dorsal and ventrolateral lobes, dorsal lobe strongly rounded apicodorsally, apex laterally compressed, crest-like, ventrolateral lobes ~ 1/2 length of dorsal lobe, rounded apically; in dorsal view with apex of dorsal lobe shallowly cleft, ventrolateral lobes very narrow; apicomesally with numerous sensilla. Inferior appendage moderately long in lateral view, subquadrate; apex in ventral view abruptly narrowed, strongly inturned, forming short subapicomesal tooth-like projection. Endotheca elongate, tubular, with dorsomesal membranous projection when everted and inflated; endotheca strongly bent ventrad at dorsomesal projection; phallotremal sclerite forming large, complex, lightly sclerotized structure with single ventral and paired lateral blade-like sclerites, but much shorter than in other fernandezi group species.
Female. Unknown.
This species is named in honor of Xavier Amigo, one of the collectors of the new species. He has provided essential support as a member of our field expeditions in Ecuador and is the beloved husband of Blanca Ríos-Touma.
Holotype. Male (pinned). Ecuador: Orellana: river, road between Wawa Sumaco and Loreto [UV], 0.73632°S, 77.49507°W, 610 m a.s.l., 11.iii.2020, Ríos, Holzenthal, Frandsen, Pauls, Amigo, UMSP000501575 (
This is a species in the Chimarra (Otarrha) patosa group, as defined by
The genitalia of the female of Chimarra (Otarrha) ramosa closely resemble those of C. parilis and C. particeps, particularly in that the ventral margin of segment VIII is somewhat produced and subtruncate, but has a distinct, shallow, U-shaped mesal invagination, bordered on either side by ventral setal warts composed of several elongate submarginal setae (Fig.
Adult. Forewing length male 3.9–4.3 mm (n = 5); female 4.7–5.0 mm (n = 2). Color nearly uniformly brownish black (fuscous). Chord of forewing hyaline, linear, indistinct. Palps short. Head relatively flat, moderately elongate (postocular parietal sclerite ca. half diameter of eye).
Male. Tergum VIII with pair of digitate projections from posterior margin, ca. as long as tergum, apices slightly dilated, with very short spines. Segment IX, in lateral view, with anterior margin nearly straight (slightly expanded in ventral half), segment longest ventrally, just above ventral process, posterior margin obliquely, nearly linearly, narrowed dorsally; posteroventral process relatively elongate (length more than 2 × width), nearly uniform in width, apex subtruncate, acute apicodorsally. Mesal lobe of tergum X (or posteromesal projection of tergum IX) very narrow and relatively short, less than half length of lateral lobes of tergum X, distinctly sclerotized, pre-apically with short, acute dorsal projection. Tergum X divided mesally, forming two sclerotized lateral lobes, narrowly separated to base; lateral lobes, as viewed laterally, each with apical invagination, extending nearly half length of segment and forming narrow, apically acute, dorsal and ventral lobes; dorsal lobe slightly shorter than ventral lobe and more strongly sclerotized, with scattered sensilla, except apically, beginning from base of lateral invagination, dorsally with three or four short setae; dorsal lobe with apex narrowed, strongly sclerotized, and distinctly downturned, ventral lobe rather weakly sclerotized, except apically, apex slightly upturned. Preanal appendage relatively large, flattened, ear-like. Inferior appendage elongate, narrow, mesally curved, tapering apically, apex inturned and acute; mesal surface with several tine-like projections: basal tine short and acute, spine-like, median tine very elongate, narrow, distinctly evident in lateral view, somewhat flexed or bent basally, pre-apical tine short and somewhat irregular in shape. Phallic apparatus with phallobase relatively short and tubular, with basodorsal expansion, distinctly ventrally flexed on ventral margin; endotheca with membranous, sack-like basodorsal lobe, lacking spines, apex of endotheca dilated, with two very short, closely apposed, subequal dorsal spines or sclerites. Phallotremal sclerite complex composed of moderately elongate rod and ring structure, with pair of short, weakly sclerotized, apicoventral sclerites.
Female. Segment VII with short, rounded ventral process near posterior margin. Segment VIII short, synscleritous; anterolateral margin very obtusely angular, with a weakly developed apodeme at ca. mid-height; posterior margin, as viewed laterally, with dorsal setal wart absent, lateral setae on a broadly rounded protrusion in ventral half, composed of marginal array of elongate setae; ventral margin of segment distinctly produced, in ventral view forming subtruncate projection with shallow posteromesal invagination, bordered on either side by ventral setal warts, each composed of more or less linear array of several elongate submarginal setae; dorsal margin of segment very short, but continuously sclerotized. Tergum IX short and very wide, with short, ventrally projecting, anterolateral apodemes; posterior margin with rounded mesal projection bearing cluster of short setae; sternum IX absent or not evident. Tergum X forming pair of subdivided lobes, each with short apical cercus; basal part of lobe large, distinctly sclerotized, and setose; apical part of lobe more weakly sclerotized, with ventromesal tract of short setae. Vaginal apparatus short, with distinct anteromesal cup-like sclerite and longitudinal anterior sclerites, including very elongate, narrowly V-shaped, posteromesal sclerite.
From the Latin ramus, meaning branches or antlers, and referring to the very branched inferior appendages of the male genitalia.
The small stream in Pastaza where paratypes were collected had a flow of 0.05 m3/s, a specific conductivity of 60 µS/cm, oxygen saturation was 90.7%, and daytime water temperature was 23.2 °C at the time of collection.
Holotype. Male (pinned). Ecuador: Napo: Wildsumaco Lodge, small stream, Coati Trail @ wooden bridge, 0.67433°S, 77.60260°W, 1420 m a.s.l., 10.iii.2020, Ríos, Holzenthal, Frandsen, Pauls, Amigo, UMSP000500642 (
Wormaldia natalis is undoubtedly most closely related to W. aymara Muñoz-Quesada & Holzenthal, 2015, described from Bolivia and resembling it in several respects, but particularly in the short, broad posteromesal projections from the posterior margin of tergum VIII (Fig.
Adult. Forewing length male 5.2 mm (n = 1). Head brown, with yellowish setae. Antenna with overall color yellowish, indistinctly annulated with light brown, somewhat flattened setae. Palps very short, with dark brown setae. Dorsum of thorax brown. Legs medium brown, spurs slightly darker; hind tibiae with sparse brush of long setae. Forewing covered with dark brown setae; apical forks I, II, III, IV, and V present. Hind wing translucent, with very fine, small, brown setae; apical forks I, II, III, and V present.
Male. Segment VIII slightly shorter than segment IX, tergum with pair of short, diverging, subtruncate posteromesal projections. Segment IX, as viewed laterally, with anterior margin weakly angularly produced at ca. mid-height, posterior margin nearly linear, angularly narrowing just below preanal appendage, dorsal margin, as viewed dorsally, very short, with short projecting anterolateral apodemes. Segment X, in lateral view, elongate narrow, somewhat down-curved, apex with short, angular apicodorsal projection, sensilla confined to apex; as viewed dorsally, elongate, tapering, subtriangular, apex subacute, with scattered sensilla, apex continuous laterally with short, diverging, rounded projections, each with several sensilla. Preanal appendage elongate, irregular in shape, with distinct basodorsal expansion, narrowing apically. Inferior appendage bi-segmented, both segments tapering from base to apex, basal segment very wide basally, ca. half height of segment IX, apical segment with apex subacute and slightly down-turned; as viewed ventrally, with basal segment bulbous, ~ 2 × width of apical segment, apical segment with dense apicomesal pad of short spines. Phallus, when viewed laterally, with phallobase very short, with basodorsal expansion, weakly sclerotized, tapering apically, endotheca with two spines, one short and strongly curved, the other elongate, narrow, more sinuously curved.
Female. Unknown.
From the Latin natalis, meaning birthday in reference to the date when the species was collected, March 10th, the shared birthday of collectors Frandsen and Holzenthal.
Holotype. Male (pinned). Ecuador: Napo: Wildsumaco Lodge, small stream, Coati Trail @ wooden bridge, 0.67433°S, 77.60260°W, 1420 m a.s.l., 10.iii.2020, Ríos, Holzenthal, Frandsen, Pauls, Amigo, UMSP000500644 (
Among Neotropical species of Wormaldia, this species is unusual in several respects and more closely resembles several North American species (
Adult. Forewing length male 5.2 mm (n = 1). Head brown, with yellowish setae. Antenna with underlying color yellowish, overlaid with dark brown, somewhat flattened setae, giving antennae an overall dark, but somewhat annulated appearance. Maxillary palps yellowish, with light brown setae. Labial palps yellowish, with light brown setae. Dorsum of thorax brown. Legs medium brown, spurs slightly darker; hind tibiae with rather dense brush of long setae. Forewing with medium brown setae for the most part, except base, apical third, and small spot at base of thyridial cell darker; apical forks I, II, III, IV, and V present. Hind wing translucent, with very few fine, small, brown setae; apical forks II, III, and V present.
Male. Sternum VII with flattened, digitate, setose, posteromesal process projecting beyond middle of segment VIII; as viewed ventrally, with process subtriangular, wide basally, subacute apically, set off from segment VII by sclerotized line. Segment VIII moderate in length, both sternum and tergum unmodified. Segment IX lightly sclerotized, with evident sclerotized lines anteriorly and posteriorly, lines connected mid-laterally, converging ventrally; as viewed laterally, segment relatively short, with both anterior and posterior margins moderately, angularly projecting at ca. mid-height. Segment X, in dorsal view, simple in structure, subtriangular, wide basally, narrowed apically, apex rounded, slightly upturned, with numerous sensilla. Preanal appendage elongate, digitate; as viewed dorsally, widely separated, emerging at lateral margins of tergum X, not fused basally. Inferior appendage bi-segmented, segments subequal in length; when viewed laterally, basal segment stout, subrectangular, distinctly wider than apical segment, apical segment nearly uniform in width, slightly expanded and rounded apically; as viewed ventrally, with basal segment bulbous, apical segment much narrower and flatter, with dense patch of short spine-like setae apically, extending basally on ventral margin. Phallus, when viewed laterally, with basodorsal expansion, phallobase relatively short, uniform in width, endotheca with indistinct patch of short, granular spines.
Female. Unknown.
Named for Volcán Sumaco, an isolated stratovolcano in the Ecuadorian Amazon, where this species was discovered.
Sumacodella elongata, Wormaldia natalis, and Wormaldia sumaco share the same type locality. Small permanent forest streams, similar to the type locality of these species, are common on the mid-elevation slopes of Volcán Sumaco. Leaflitter is abundant and waters are clear with very low conductivity (20–55 µS/cm), highly oxygen saturated (close to 100%), and warm (17–20 °C).
We are grateful to Mashpi Lodge and Reserve (Carlos Moroczh, Mateo Roldán), Mashpishungo Reserve (Agustina Arcos and Alejandro Solano), Wildsumaco Lodge (Jonas Nilsson), and Finca Upano (RhoAnn Wallace and Galo Real) for the facilities during our field trips. Ernesto Rázuri-Gonzales, Andres Morabowen, Paul Frandsen, Jolanda Huisman, Steffen Pauls, Olivier Amigo and Xavier Amigo (Nature Experience) provided essential assistance and warm companionship during the field work. Appreciation is extended to Allan Santos and Gleison Desidério, as well as Associate Editor Ana Previšić, who thoroughly reviewed the manuscript and offered many suggestions to improve it. This research was funded by the Dirección General de Investigación, Universidad de Las Américas (Ecuador): “Montane freshwater diversity, from taxonomy to functional genomics, an approximation from Trichoptera” (CODE AMB.BRT:19.02) and by the University of the Minnesota Agricultural Experiment Station projects MIN-017-029, -079, -094.
Map S1
Data type: kml file.
Explanation note: Collection locality data for new species of Ecuadorian Philopotamidae (Trichoptera) for import into Google Earth.