Chlorichaeta orba Mathis et Zatwarnicki, 1993

Krivosheina, M. G., 2011, First Record Of The Shore-Fly Chlori- Chaeta Orba Mathis Et Zatwarnicki, 1993 (Diptera, Ephydridae) From Thailand, Far Eastern Entomologist 220, pp. 14-16 : 15-16

Chlorichaeta orba Mathis et Zatwarnicki, 1993

Figs 1–2

MATERIAL. Thailand: Phuket (north part of island), 17-24.II 2009, 2 , 1  (N.E. Vikhrev).

DESCRIPTION. Very small fly (1.8-2.6 mm). The species belongs to the group with yellow hind basitarsomere as well as tarsomeres 2 and 3 which are yellow too. Ch. orba is closer to Ch. mais Mathis & Zatwarnicki, 1993 differing from it in the following characters: extended ocellar triangle shiny and smooth similar to parafrons (not granulose), silvery-white microtomentum on parafacials as 2 (not 3) patches; scutum very lightly microsculptured, scutellum more so, appearing granulose, scutum with some metallic bluish (not bronzishgold) luster, halter yellow.

Male terminalia with surstylus digiform in lateral view, narrowly rounded apically, curved anteroventrally (Figs 1-2). Hypandrium in lateral view L-shaped with anteromedial portion slender, aedeagal apodeme enlarged towards attachment with hypandrium, postgonite linear without a process, distiphallus slightly longer than basiphallus, angulate, dorsal angle acutely produced, rounded, bearing 1 pair of slender lateral processes at base and a single medial process.

DISTRIBUTION. The species was described from Sri Lanka (Mathis & Zatwarnicki, 1993). It was found in Philippines, Australia (Northern Territory) and Papua New Guinea too (Mathis & Zatwarnicki, 1995). Herein this species is firstly mentioned from Thailand.

I am very grateful to Dr. Nikita Vikhrev (Zoological Museum, Moscow University) who collected and handed me this interesting fly for the study .