Anthomyza clara Roháček, 2006

Roháček, Jindřich, 2021, New species and records of Anthomyzidae (Diptera) from the East Palaearctic, with a checklist of taxa occurring in the area, Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 61 (1), pp. 261-288 : 273

Anthomyza clara Roháček, 2006

( Figs 36–45 , 49, 50 )

Material examined. JAPAN: HඈΚΚൺංൽඈ: Kiyokawa, Ashoro, 23.vii.1967, 2 JJ 1 ♀, T. Saigusa leg. ( SIINH, 1 J 1 ♀ genit. prep.).

Remarks. This little known species belongs to the Anthomyza umbrosa group (see RඈIJගඹൾκ 2006, Rඈ- IJගඹൾκ & Bൺඋൻൾඋ 2016). The recent molecular study by RඈIJගඹൾκ et al. (2019) revealed that the E. Palaearctic A. drachma Sueyoshi & Roháček, 2003 could also belong to this group. Consequently, the finding of A. clara in Japan is considered important inasmuch as it is the second species of the A. umbrosa group in the area. Because of its long-ciliate 1st flagellomere and arista, and pale body colouration ( Figs 49, 50 ), A. clara resembles some species of the A. neglecta group. It can be distinguished from them by the more elongate head and long subvibrissa ( Fig. 50 ), the shining frontal triangle and the male f 3 with short thickened posteroventral setae and, particularly, by its entirely dissimilar genitalia. The structures of the male and female terminalia of the Japanese specimens were studied in detail to test differences against paratypes from Switzerland. In the male genitalia (first illustrated in situ, see Fig. 36 ), only a minute difference in the distal end of the gonostylus was found (subapically with more excavated posteromedial margin, see Fig. 38 ). Structures of both the hypandrial (see them now also in ventral view, Fig. 39 ) and aedeagal complexes ( Figs 39–45 ) resemble those of paratypes in much detail (cf. RඈIJගඹൾκ 2006: figs 216, 218–220). Their description can be supplemented as follows: secondary sclerite anterior to postgonite ( Figs 39, 41 , ans) always well developed and V-shaped in ventral view ( Fig. 39 ). Small posterior bulge of pregonite (with 2 setae) more or less distinctly separate, at least posteriorly (cf. Fig. 41 ). Phallapodeme with both apex ( Fig. 43 ) and base ( Fig. 42 ) symmetrical.

Biology. No new information can be added to the poor knowledge from Europe (see RඈIJගඹൾκ 2006). This rare species is probably associated with large sedges in wetland habitats by lakes and near the sea.

Distribution. Anthomyza clara was described from Switzerland, Lithuania and Estonia (RඈIJගඹൾκ 2006) and subsequently recorded by RඈIJගඹൾκ (2009) from the Central European Territory of Russia (Moscow vicinity). Its discovery in Japan (first record from E. Palaearctic) is, therefore, surprising.

Figures

Figs 36–38. Anthomyza clara Roháček, male (Japan). 36 – male genitalia in situ, laterally; 37 – external genitalia, caudally; 38 – gonostylus, ventrolaterocaudally (widest extension view). Scales = 0.1 mm (Figs 36, 37) and 0.05 mm (Fig. 38). For abbreviations see see p. 263.

Figs 39–45. Anthomyza clara Roháček, male (Japan). 39 – hypandrial complex, ventrally; 40 – transandrium, caudally; 41 – hypandrial complex, laterally; 42 – base of phallapodeme, dorsally; 43 – apex of phallapodeme, dorsally; 44 – apex of filum of distiphallus, ventrally; 45 – aedeagal complex, laterally. All scales = 0.1 mm. For abbreviations see see p. 263.

Figs 49–55.Some E. Palaearctic Anthomyzidae.49 – Anthomyza clara Roháček, 2006, male, laterally (Japan), body length 2.22 mm; 50 – same specimen, head and thorax, dorsolaterally; 51 – Epischnomyia merzi Roháček, 2009, male, laterally (South Korea), body length 2.58 mm; 52 – same specimen, head and thorax, dorsally; 53 – Stiphrosoma fissum Roháček, 1996, male, laterally (South Korea), body length 1.79 mm; 54 – same species, female, laterally (South Korea), body length 1.85 mm; 55 – Stiphrosoma humerale Roháček & Barber, 2005, male, laterally (Far East of Russia), body length 1.90 mm. Photos by J. Roháček.