Terocelion terezae Ševčík 2012, sp. nov.
Creators: name: Ševčík, Jan
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Keroplatidae
Terocelion
Terocelion terezae

description: Terocelion terezae sp. nov.   
(Figs. 2, 4, 6, 8)  
 Type material. HOLOTYPE: J, BRUNEI: Seria, swamp forest, 14.ii.–5.iii.1982, M. C. Day leg., Malaise trap (BMNH).   
  Description. Male.  Body length (without antennae) 5.9 mm. Wing length 3.5 mm (holotype). Ratio of wing length to width 2.8.   
 Head. Compound eyes narrow, 2.2 times as high as broad in lateral view, deeply emarginated above antennae. Antenna long, about 1.6 times as long as the head and thorax together, strongly pectinate, mostly brown, with 14 flagellomeres (Fig. 2). Flagellomeres 1 to 13 with a long anterior process, the longest about as long as the height of head.   
For the other characters see the previous species.  
 Thorax. Mostly yellowish brown, the chaetotaxy and coloration similar to the previous species. Mediotergite yellowish, posteriorly protruding, with a distinct triangular subscutellar membranous area sagitally.   
 Wing (Fig. 4) hyaline, distinctly marked (Figs. 2, 4). Wing venation as in the previous species, except R-M fusion shorter than the stem of M-fork and CuA 2 even more downcurved towards the tip which does not reach the wing margin.   
 Legs. Coxae dark brown. Femora yellow, basally and apically darkened. Tibiae light brown, darkened at apical ends. All tibiae with trichia arranged in dense longitudinal rows. Hind tibia ventrally (except proximal and distal ends) slightly swollen and densely covered with trichia not arranged in rows. Tibial spurs: 1, 2, 2. Mid and hind tibia with posteroventral spurs about twice as long as the anteroventral ones and apically with a transverse comb of closely set short setulae.   
 Abdomen relatively long, mostly dark brown, tergites 3–6 with light anterior markings (Fig. 2). Sternites 1–5 yellowish with dark apical margins. Terminalia (Fig. 6) brown. Tergite 9 rounded, subtriangular, about as broad as long. Gonocoxites almost completely fused, with dark setae on the posterior margin. Gonostylus 1.4 times as long as gonocoxite, 3.5 times as long as wide, dorsoventrally flattened, apically rounded, without teeth. Longitudinal furrow on gonostylus less distinct than in the previous species.   
  Female.  Unknown.   
 Differential diagnosis. The strongly pectinate male antennae are diagnostic for this species, in combination with the characters stated above under the diagnosis of the genus.   
 Etymology. This beautiful species is named after my beautiful wife, Tereza.   
 Distribution. Brunei.   
 Comments. The completely fused gonocoxites and the more developed subscutellar membranous area are noteworthy and may be considered as apomorphic features in relation to T. melanoleucum sp. nov. Both the new species of Terocelion gen. nov. also have relatively the longest pectinate antennae (in relation to body length) among all keroplatids. Within Sciaroidea, the record holder in this respect is probably the Oriental Pectinepsia pulcherrima Ševčík & Hippa, 2010 with pectinate antennae almost as long as the entire body (ŠEVČÍK & HIPPA 2010). Interestingly, this species like T. terezae sp. nov. also occurs in northern Borneo, which poses a question about the purpose of such strongly modified antennae in this area.
description: Published as part of Ševčík, Jan, 2012, Terocelion gen. nov., a new Oriental genus of Keroplatidae (Diptera) with pectinate antennae, pp. 495-503 in Acta Entomologica Musei Nationalis Pragae 52 (2) on page 501, DOI: 10.5281/zenodo.5332152