Nepaletricha sigma, 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 : 737-738

Nepaletricha sigma sp. nov.

( Figs 2B , 5A–D )

Type material. HOLOTYPE: J, INDIA: ARUNACHAL PRADESH: Etalin vicinity, 700 m, 28°36މ56ފN, 95°53މ21ފE, 12–25.v.2012, L. Dembický leg., AP 3 / 2012, MZM Expedition ( MZMC) . PARATYPE: J, INDIA: ARUNACHAL PRADESH: Hunli vicinity, 1300± 100m, 28°19މ32ފN, 95°57މ31ފE, 26.v.–1.vi.2012, L. Dembický leg., AP 4 / 2012, MZM Expedition ( JSOC), GenBank accession numbers for its DNA sequences are KJ136697 (12S) and KJ136733 (16S), see ŠEVýÍK et al. (2014).

Description. Male. Head. Distal part of antennae lacking beyond flagellomere 1 or 3. Colour of head brown, mouthparts and antenna slightly paler. Face with 5 setae medioventrally. Maxillary palpus, Fig. 2B : palpomere 2 with dome-like sensilla mesially on distal part, palpomere 3 with scattered hyaline sensilla ventrolaterally. Antenna similar to Nepaletricha montana ( HIPPA et al. 2009: Fig. 1B ): scapus with 2 setae, flagellomere 1 7.1 times longer than broad.

Thorax. Brown. Similar to N. furcata ( HIPPA et al. 2009: Fig. 1A ): scutum with 6 stronger lateral setae plus a few weaker ones posteriorly which are poorly visible in the mount, 11–12 dorsocentral setae and 0 acrostichal setae, scutellum with 4 setae and prothoracic epimeron with 5–6 setae. Legs. Distal part beyond trochanters lost on all legs. Colour of coxae and trochanters brown. Coxae similar to N. furcata ( HIPPA et al 2009: Fig. 1A ) but their lateral setae more distinctly in a single row. Wing. Similar to N. furcata ( HIPPA et al. 2009: Fig. 2B ): Sc setose dorsally, one seta ventrally on the left side, R and R 1 setose dorsally, R 1 distally setose on both sides, R 4+5 setose dorsally and ventrally, stM, M 1 and M 2 setose dorsally and ventrally, CuA 1 setose dorsally, apically also ventrally, 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 2.7 (3.0) mm. Abdomen. Brown. Segment 8, Fig. 5 D : note the lateral setae on sternite. Hypopygium, Figs. 5A,B,C : Tergite 9 posteriorly with a pair of curved lobes apically bearing 3 megasetae. Sternite 9 posterodorsally with an S-shaped setose lobe with a branch on apical half, posteroventrally with a plate-like setose lobe. Gonostylus bilobed, with a few setae on both. Aedeagus not visible in detail in the mount, apparently in dorsal or ventral view arrow-shaped as in Fig. 4D . Tegmen (parameres) not visible in detail in the mount. Cerci narrow, with a few long setae. Sternite 10 medially divided, each half with two long posterior setae.

Female. Unknown.

Etymology. The name sigma is derived from the eighteenth letter of the Greek alphabet and refers to the sigma-shaped lobe posterolaterally on the gonocoxa; noun in apposition.

Discussion. Nepaletricha sigma is similar to N. lobosa sp. nov. For further discussion, see under the latter.

Figures

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. 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.

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

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.