Research Article |
Corresponding author: Milada Bocakova ( milada.bocakova@upol.cz ) Academic editor: Lyubomir Penev
© 2016 Luiz Felipe Lima Silveira, Jose Ricardo Mermudes, Milada Bocakova.
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:
Da Silveira LFL, Mermudes JRM, Bocakova M (2016) Systematic review of the firefly genus Scissicauda (Coleoptera, Lampyridae, Amydetinae) from Brazil. ZooKeys 558: 55-75. https://doi.org/10.3897/zookeys.558.6040
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The Amydetinae genus Scissicauda McDermott, 1964 is reviewed and redescribed. We describe S. balena sp. n. from Brazil as new, and provide illustrations of the structural features and a key to species of both sexes.
Amydetini , Neotropical Region, Psilocladina
The subfamily Amydetinae is a little known firefly group distributed predominantly in South America. Molecular data identified Lampyrinae as sister to Amydetinae (Bocakova et al. 2007, Viviani 2011,
Most Amydetinae share a complex antennal morphology in the males, except some species of Vesta, whose antennae are often serrate. Most of the females remain undescribed.
The holotype of S. disjuncta was loaned from the
Terms for structural features follow
Scissicauda McDermott, 1964: 10, 39; 1966: 87.
Schistura Olivier, 1911:51 (nec Schistura McClevelland, 1838 Actinopterygii).
Aethra
Laporte, 1833 (partim). Olivier in Wytsman 1907: 16;
Lychnuris
Motschulsky, 1853 (partim).
Schistura
Olivier, 1911: 51;
Lucidota disjuncta Olivier, 1896, by monotypy.
Antenna 11-segmented, compressed, filliform to flabellate, uniramose (while biramose in Psilocladus and Pollaclasis), with dense, upright bristles, rami atmost twice longer than antennomere body, attached basally (distally in Ethra). Antennal sockets large, two thirds of frontal width, close-set, reniform, antennifer process distinct. Occiput as wide as one third head width. Apical maxillary palpomere lanceolate. Apical labial palpomere securiform. Pronotum semilunate, with a marginal row of gross, deep punctures. Abdominal terga with posterior angles progressively produced and acute. Tibial spurs present. Tarsomere I 2× longer than II, II 2× longer than III, III of subequal length as IV. Tarsomere IV bilobed, lobes reaching two thirds of length of tarsomere V. Male sternum IX retracted under VIII. Aedeagus with phallus consisting of a dorsal plate basally fused to parameres, symmetric, projected dorsolaterally toward apex; ventral plate with lateral margins sinuose, weakly sclerotized; parameres symmetric, apically rounded, with a ventrobasal process rudimentary or extended beyond phallus.
Head (Figs
Thorax (Figs
Hind wing well-developed, posterior margin sinuose, 2× as long as wide, r3 almost as long as r4, radial cell 2× wider than long, almost reaching anterior margin, costal row of setae inconspicuous (Fig.
Abdomen (Figs
Scissicauda disjuncta, male abdomen. 30 dorsal 31 ventral 32 pygidium ventral 33 sternum VIII ventral 34 terminalia, dorsal 35 syntergite and sternum IX, dorsal 36 schematic drawing of aedeagus, dorsal A paramerae and phallum B paramerae, dashed lines show basal part of dorsal plate C Phallic dorsal plate, dashed lines show basal part D ventral plate 37 dissected phallum and paramerae, dorsal 38–41 aedeagus 38 dorsal, 39 lateral 40 ventral 41 lateral view, dissected. Scale bar: 1.0 mm (30–31); 0.5 mm (32–33); 0.5 mm (34–35); 0.5 mm (37–41). Arrow: phallic groove.
Male. Syntergite consisting of paired lateral plates convergent posteriad (putatively tergite IX or paraproct), median transversal suture absent (Figs
Female. Sternum VIII as long as wide, spiculum ventrale long and slender, three fourths sternum length (Fig.
Concerning the etymology for the generic name,
1 | Elytron with sutural margin brown to blackish-brown (Figs |
Scissicauda disjuncta (Olivier, 1896) |
1’ | Elytron with sutural margin pale yellow (Figs |
Scissicauda balena sp. n. |
Scissicauda balena sp. n., male abdomen. 57–58 abdomen 57 dorsal 58 ventral 59 syntergite dorsal 60 sternum IX ventral. segment VIII 61 pygidium, dorsal 62 sternum VIII, ventral 63–66 aedeagus 63 dorsal 64 lateral 65 ventral 66 oblique. Scale bar: 2.0 mm (57–58); 1.0 mm (59–60); 1.0 mm (61–62); 0.5 mm (63–66).
Lucidota disjuncta Olivier, 1896: 1.
Aethra
disjuncta
(Olivier, 1896). Olivier in Wytsman, 1907: 16;
Schistura
disjuncta
(Olivier, 1896).
Lychnuris
disjuncta
(Olivier, 1896);
Scissicauda
disjuncta
(Olivier, 1896).
Holotype (Fig.
BRAZIL. Rio de Janeiro. Rio de Janeiro, without other data, 1 male, 2 females, Fry coll. (BMNH); Petrópolis, P. N. Serra dos Órgãos, 25/11/2012, Mermudes & Mattos col. (DZRJ); Teresópolis, P. N. Serra dos Órgãos, 15/XII/2014, A. Katz col. (DZRJ), ~1100m, 14-17/I/2015, L. Silveira col. (DZRJ), 18/XII/2014, 1 female, V.A.C WILSON col. (DZRJ), 1050m, XII/2013, Malaise trap, 1 male, 2 females, R. Monteiro col. (DZRJ), 1050m, I/2014, Malaise trap, 2 females, R. Monteiro col. (DZRJ), 1050m, II/2014, Malaise trap, 2 females, R. Monteiro col. (DZRJ).
Males with antennae flabellate (Fig.
Colour pattern. Integument from entirely brown to blackish-brown, scape and pedicel yellowish-brown (Figs
Male. Antennae (Fig.
Female. Antennomeres III–XI compressed, subequal in length, antennomeres III–X serrate (Figs
Biology. Active during daytime, on moisty days. In our experimental design (Jun/2013–Jun/2014), individuals were only collected between December and February, when there is a local increase in pluviosity (Graphic
Holotype (Figs
Males with antennal lamellae absent (Fig.
The specific name balena is a Latin expression for whale, whose tail resembles the pygidium of this species. The name is formed as a noun in apposition.
Colour pattern. Integument overall blackish-brown, with scape brownish (Fig.
Male. (Figs
Female. Sternum VIII rounded, indented medially (Fig.
Scissicauda has flabellate antennae, mandibles arcuate (“normal mandibles” auctorum), elytral secondary pubescence absent, and abdominal spiracles dorsally-oriented, all of which are features of the Amydetinae. The long and diffused antennal branches are features of the Psilocladina. A unique feature amongst the Psilocladina is the abdominal sternum VIII covering sternum IX. However, Psilocladina was deemed polyphyletic on the most comprehensive phylogenetic analysis for the Lampyridae (
Phallus with ventral plate is a condition found in other lampyrids as the Luciolinae (
Finally, S. disjuncta share remarkable similarities on reproductive morphology with some taxa considered basal amongst the Lampyridae (Bocakova et al. 2007, Stanger-Hall et al. 2007), such as: some Photurinae taxa, e.g. Presbyolampis spp. (cf. Kazantsev and Perez-Gelabert 2008), and Photuris (cf.
We describe for the first time the females of Scissicauda disjuncta and S. balena sp. n., detailing especially the female internal tract, which is inedit for South American taxa and also for the Psilocladina as a whole. Other psilocladina taxa with known females are Psilocladus Blanchard, 1846 and Pollaclasis Newman, 1838, both genera showing virtually no secondary sexual dimorphism. In Scissicauda, secondary sexual dimorphism is stronger in S. disjuncta, where only the males have long lamellae and teethed pro and mesoclaws. S. balena sp. n. is dimorphic only in abdominal segments VIII and beyond. Besides the slightly greater size of the females in both Scissicauda species, there are no other noteworthy dimorphic character.
We suggest male pygidium is involved in reproduction. This could be either working as a clamp, or by enhancing female fecundity. Clamping structures allow prolonged copulation, which is generally assumed to ensure paternity by preventing other males to access - and thus fertilize the eggs of the female (Wing et al. 1993). The evidence that male pygidium may work as a clamp is that anterior angles of female pygidium, which should attach male abdomen, are sclerotized. Alternatively, male reproductive structures may stimulate females while mating, and thus increase fertilization and/or oviposition rates. It was shown that in polyandric systems, female choice can promote male genitalic diversification (
Although similar sampling efforts have been made in other montane areas of the Rio de Janeiro State (notably the Serra da Mantiqueira formation), Scissicauda was only collected in the Serra dos Órgãos (Petrópolis and Teresópolis municipality). However, the holotype of S. disjuncta is reported from Rio de Janeiro (
We thank Serra dos Órgãos National Park for housing us during fieldwork; Laboratório de Ecologia de Insetos (