Ctenosciara depressa, Vilkamaa, Pekka, Hippa, Heikki & Mohrig, Werner, 2012

Vilkamaa, Pekka, Hippa, Heikki & Mohrig, Werner, 2012, The genus Ctenosciara Tuomikoski (Diptera, Sciaridae) in New Caledonia, with the description of eight new species, Zootaxa 3255, pp. 37-51 : 44-45

Ctenosciara depressa sp. n.

Figs 5 A–C

Material studied. Holotype male. NEW CALEDONIA, Rivière Bleue N.P., (parc 6), rainforest, 20.I.1993, Bonnet de Larbogne, Chazeau & Guilbert (in MNHN). Paratype. 1 male, same data as holotype but parc 7, 21.VII.1992 (in MNHN).

Description. Male. Head. Brown, antenna unicolorous pale brown except scapus and pedicellus paler, maxillary palpus very pale brown. Eye bridge 3 facets wide. Face with 8–18 scattered longer and shorter setae. Clypeus with 1 seta. Maxillary palpus with 3 palpomeres; palpomere 3 longer than palpomere 1, palpomere 2 shortest; palpomere 1 with 1–3 setae, with a dorsal patch of sensilla; surface of antennal flagellomeres rough, flagellomere 4 ( Fig. 5 A) 2.1.–2.5x as long as wide, the neck longer than broad, the longest setae longer than the width of flagellomere. Thorax. Brown, setae pale. Anterior pronotum with 2–3 setae. Episternum 1 with 3–7 setae. Scutum with long dorsocentrals, with some longer and shorter laterals, scutellum with 4 longer and some short setae. Wing. Hyalinous. Length 1.1–1.2 mm. Width/length 0.45–0.50. Veins distinct. R1/R 0.45–0.65. c/ w 0.70 – 0.80. r-m and bM subequal in length. Posterior wing veins non-setose. Legs. Yellow. Coxal setae pale. Front tibial organ with pale vestiture forming a long complete row. Front tibial spur slightly shorter than the tibial width. Claws with fine teeth. Abdomen. Setae pale and long. Hypopygium, Figs 5 B, C. Brown, concolorous with abdomen. Gonocoxa longer than gonostylus, mesial margin with sparse setosity. Gonostylus slightly curved, narrowed towards apex, with the mesial side weakly impressed at apical fourth; with a dense apical vestiture, with an apical tooth, with 5 megasetae in subapical group, without apical megasetae. Tegmen subquadrangular, weakly sclerotized, aedeagal apodeme long.

Discussion. By its apicolaterally depressed gonostylus, Ctenosciara depressa resembles remotely the Japanese C. angustistylata Sutou & Ito and C. japonica Sutou & Ito , but differs from both in the gonostylar form, in having longer gonostylar megasetae and in having an apically truncate, not roundish, tegmen. For differences between C. depressa and the most similar New Caledonian species, see under C. cracens .

Etymology. The name is Latin, depressa , depressed, referring to the depressed/impressed apicolateral part of the gonostylus.

Figures

FIGURE 5. Ctenosciara depressa sp. n. (A paratype, B, C holotype). A. Antennal flagellomere 4, lateral view. B. Part of hypopygium, ventral view. C. Gonostylus, ventral view. Scale 0.1 mm.