Allometopon hybos Sasakawa, 2009

Owen Lonsdale, 2016, Revision of the genus Allometopon Kertész (Diptera: Clusiidae), Zootaxa 4106 (1), pp. 1-127 : 35

Allometopon hybos Sasakawa, 2009

Figs 120–124

Allometopon hybos Sasakawa 2009: 45 .

Description (partially from Sasakawa (2009)). General: ( Figs 120, 121 ) Body length 3.5–3.6mm (♂), 3.8–4.4mm (♀). Arista pubescent. M1+2 ratio 2.9. First flagellomere relatively large and high, almost reniform, but not long. Gena relatively high, slightly more than ¼ height of eye.

Chaetotaxy: Four fronto-orbital setae, posterior seta longer. Ocellar seta approximately twice length ocellar tubercle. Postvertical as long as ocellar tubercle. Interfrontal seta relatively large, well-developed. Two dorsocentral setae, closely spaced near posterior margin of scutum, anterior seta approximately ¾ length; smaller third anterior dorsocentral possibly present. Acrostichal seta well-developed. Two large, stout lateral scutellar setae arranged transversely across scutellum.

Colour—male: Setae yellow to slightly brownish. Body mostly yellow, with dorsum of thorax and frons with slight orange tint; first flagellomere black, face (except dorsum) whitish, postgena whitish with anterior half pilose, and parafacial and gena and whitish and pilose; halter white; abdomen brown with tergite 1 paler and epandrium pale brown; paratype male with palpus brownish apically. Wing clear.

Colour—female: As described for male except frons and mesonotum brown tinged, palpus entirely dark brown or only on apical ½–2/3, and abdominal tergites darker posteriorly (about posterior half on tergites 3 and 4, tergites 5 and 6 dark brown), and ovipositor sheath brownish-yellow.

Male terminalia: ( Figs 122–124 ) Epandrium with narrow spine projecting posteriorly from ventral margin. Surstylus angled posteriorly, subrectangular and slightly curved in cross-section; with strong incurved spine on distal margin. Hypandrium with shallow, narrow lobe with two setae, and long, posteriorly directed arm. Phallapodeme rod-like with shield closely held to shaft along length. Pregonite small, ovate, densely setose. Postgonite narrow, very elongate, with setae on inner and antero-marginal surfaces on distal 2/3. Basiphallus welldeveloped. Epiphallus relatively large and curved. Distiphallus small and subrectangular, approximately 2/5 length phallapodeme. Paraphallus about as long as distiphallus, curved and spinulose dorsally on distal half.

Female terminalia: Not dissected.

Distribution: Laos, Malaysia (Sabah), Philippines.

Holotype: LAOS. Wapikhanthong Prov.: Wapi, 15.xii. I967, native collector [Type No. BPBM 17194] (1♂, BPBM).

Comments: Colour, chaetotaxy and a unique spine on the epandrium reveal a close relationship between this species and Allometopon acum ( Fig. 1 ), which are differentiated in the key.

Figures

FIGURES 120 – 124. Allometopon hybos Sasakawa, holotype; 120: photo, dorsal; 121: same, lateral; 122: external genitalia, posterior; 123: same, right lateral; 124: internal genitalia, left lateral.

FIGURES 1 – 5. Allometopon acum spec. nov.; 1: photo, dorsal; 2: photo, lateral; 3: external male genitalia, left lateral; 4: same, posterior; 5: internal male genitalia, left lateral.