Pseudochetoneura, Ševčík, 2012

Ševčík, Jan, 2012, Pseudochetoneura gen. nov., a peculiar new genus from Ecuador, with notes on Chetoneura (Diptera: Keroplatidae), Acta Entomologica Musei Nationalis Pragae 52 (1), pp. 281-288 : 282

Pseudochetoneura gen. nov.

Type species. Pseudochetoneura otongensis sp. nov., here designated.

Diagnosis. Two ocelli. Antennae with 14 flagellomeres. Flagellomeres short, cylindrical, at most as long as wide. Mouthparts strongly reduced, palpus with only one segment. Compound eyes relatively narrow in lateral view. Both mediotergite and laterotergite bare. Mediotergite without distinct membranous subscutellar area. Wing unmarked, slightly darkened, membrane covered with microtrichia. Radial veins and CuA 2 dark and strong, the other veins lighter. C produced beyond R 5 to about half the distance between the tips of R 5 and M 1. Vein Sc ending free, apically obsolete, reaching to the level of Rs. R-M fusion short but distinct. Crossvein Rs relatively short and almost vertical. M-Cu connection and basal part of M indistinct. The stem of M-fork long. Cu-fork with point of furcation at the base of wing. CuA 1 weaker, CuA 2 strong, distinctly downcurved towards the tip. CuP relatively long and strong, A 1 short, distally weak. Legs without special tibial organs. Tibial setae irregularly arranged. Abdomen distinctly bent downwards. Male terminalia with gonocoxites fused only basally. Gonostylus relatively large, about as long as wide, with rounded apical projection. Aedeagal complex large, its laterally compressed plate extending into segment 7. Tergite 9 short, transverse, three times as broad as long.

Differential diagnosis. The new genus is most similar to the Oriental genera Chetoneura and Microkeroplatus Ševčík & Papp, 2009 , from which it differs mainly in the length of male antennae (only 3 times as long as head), shape of flagellomeres (these are not S-shaped or anteriorly prolonged), stronger reduction of mouthparts (reduced labella, one palpomere without palpifer), shorter wings (ratio of length to width only 2.2), wing venation (Sc ending free, R 1 reaching well beyond the point of furcation of M), distinctly bent abdomen, and peculiar male terminalia (remarkable aedeagal complex, short tergite 9). The habitus photograph of Chetoneura cavernae Colless, 1962 is presented here for comparison ( Fig. 6 ) to supplement the description by COLLESS (1962).

Etymology. The name is modified from Chetoneura , a related genus, by the Greek prefix pseudo-, referring to their similarity. Gender is feminine.

Figures

Fig. 6–7. Chetoneura species. 6 – Chetoneura cavernae Colless, 1962, male habitus (Cameron Highlands, Malaysia); 7 – Chetoneura oligoradiata (Papp, 2006), wing venation (holotype, Thailand).