Nepaletricha lobosa, Hippa & ŠEVýÍK, 2014

Hippa, Heikki & ŠEVýÍK, Jan, 2014, Notes on Nepaletricha (Diptera: Sciaroidea incertae sedis), with description of three new species from India and Vietnam, Acta Entomologica Musei Nationalis Pragae 54 (2), pp. 729-739 : 735

Nepaletricha lobosa sp. nov.

( Figs 1 , 2C , 4A–D )

Type material. HOLOTYPE: J, VIETNAM: Con Dao N. P., Con Son Isl. , 8°41މ30ފN, 106°38މ00ފ E, 17–24.vi.2012, Malaise trap, leg. J. Constant & J. Bresseel. I.G.: 32.161 ( IRSN).

Description. Male. Head. Distal part of antennae lost beyond flagellomere 7 or 8. Colour of head brown. Face medioventrally with transverse row of 4 setae. Maxillary palpus, Fig. 2 C : palpomere 2 with dome-like sensilla mesially on distal part, palpomere 3 with scattered hyaline sensilla ventrolaterally. Antenna similar to N. montana ( Figs 1B,E in HIPPA et al. 2009): scapus with 2 setae, flagellomere 1 7.2 times longer than broad, flagellomere 4 2.8 times longer than broad. Thorax. Brown. Similar to N. furcata ( HIPPA et al. 2009: ¿g. 1 A): scutum with 5 lateral setae, 8–10 dorsocentral setae and 3 acrostichal setae anteriorly, scutellum with 4 setae and prothoracic epimeron with 2 setae. Legs. Brown. Coxae similar to N. furcata ( Fig. 1A in HIPPA et al 2009). Apical part of tibia 1 similar to N. montana ( HIPPA et al. 2009: Fig. 1G ) but tibial organ (patch of setae subapically on the prolateral side) still less differentiated. Wing. Similar to N. furcata ( HIPPA et al. 2009: Fig. 2B ). Sc setose dorsally, with only 2 or 3 setae, R setose dorsally, R 1 setose dorsally and ventrally, R 4+5 setose dorsally and ventrally, stM, M 1 and M 2 setose dorsally and ventrally, CuA 1 setose dorsally, CuA 2 setose dorsally and A 1 setose dorsally and ventrally; wing membrane setose dorsally and ventrally. Colour of wing and halter brownish. Wing length 1.9 (2.2) mm. Abdomen. Brown. Segment 8 similar to Fig. 5D , sternite similarly laterally setose. Hypopygium, Figs 4A–D : Tergite 9 conspicuously small in relation to gonocoxa, posteriorly with curved horn-like lobe with 4 megasetae apically. Gonocoxa with large posteroventral setose lobe and a smaller more lateral setose lobe. Gonostylus crescent-shaped or bilobed with 3 setae on both lobes. Aedeagus in dorsal or ventral view arrow-shaped. Tegmen surrounding the aedeagus, with a pair of large dorsal lobes. Cerci narrow, with 2 setae posteriorly. Sternite 10 medially divided, with 1 seta posteriorly on each half.

Female. Unknown.

Etymology. The name is Latin adjective lobosus (-a, -um), full of lobes, referring to the numerous different lobes on the gonocoxa 9.

Discussion. Nepaletricha lobosa is similar to N. sigma sp. nov. They differ from other Nepaletricha e.g. by having a pair of curved horn-like lobes with apical megasetae dorsally at the posterior margin of tergite 9. Nepaletricha lobosa differs from N. sigma by having its tergite 9 unusually small in relation to gonocoxa, by having the horn-like lobes at the posterodorsal margin of tergite 9 much shorter and with 4 apical megasetae instead of 3, by having the posterolateral ventral plate-like lobe very large and by lacking a long S-shaped branched lobe posterodorsally on the gonocoxa ( Figs 5C ). The latter is represented in N. lobosa by a flat subquadrangular lobe, in Fig. 4A visible at ventral posterolateral corner of the gonocoxa. Nepaletricha lobosa seems to differ from other Nepaletricha by having only a couple, not many, setae dorsally on the wing vein Sc. It differs from N. dembickyi and N. sigma by having the vein R 1 setose both dorsally and ventrally, not only dorsally; the ventral chaetotaxy is not known concerning the three earlier described species. Nepaletricha lobosa is similar to N. mystica by having acrostichal setae on the scutum.

Figures

Fig. 1. Nepaletricha lobosa sp. nov. (paratype). Habitus.

Fig. 2. Maxillary palpus, dorsal view (A, B, C) and palpomere 3, ventral view (D). A, D – Nepaletricha dembickyi sp. nov. (holotype). B – N. sigma sp. nov. (holotype). C – N. lobosa sp. nov. (holotype). Scale 0.1 mm.

Fig. 4. Nepaletricha lobosa sp. nov. (holotype). A – Hypopygium, lateral view. B – Tergite 9 with associated parts, ventral view. C – Part of gonocoxa with associated parts, dorsal view. D – Aedeagus and tegmen, dorsal view. Scale 0.1 mm. 1 – tergite 9, 2 – apical megasetae of the lobe at the posterior margin of tergite 9, 3 – gonocoxa, 4 – gonocoxal lobe, 5 – gonocoxal apodeme, 6 – gonostylus, 7 – aedeagal apodemes, 8 – apex of aedeagus, 9 – lateral lobe of aedeagus, 10 – tegmen, 11 – lobe of tegmen, 12 – apodemes of tegmen (parameral apodeme), 13 – seta of cercus, 14 – seta of sternite 10.

Fig. 5. Nepaletricha sigma sp. nov. A – Tergite 9 with associated parts, lateral view (holotype). B – Tergite 9 with associated parts, ventral view. C – Gonocoxa with associated parts, lateral view. D – Abdominal segment 8, dorsal view. Scale 0.1 mm. 1 – posterodorsal sigmoid lobe of gonocoxa, 2 – posteroventral plate-like lobe of gonocoxa, 3 – gonocoxal apodeme, 4 – gonostylus, 5 – aedeagus + tegmen.