Circumphallus significans, Papp, 2011

Papp, L., 2011, Description Of A New Genus And A New Family, Circumphallidae Fam. Nov., Of The Acalyptrate Flies (Diptera), Acta Zoologica Academiae Scientiarum Hungaricae 57 (4), pp. 315-341 : 319-320

Circumphallus significans sp. n.

Holotype male ( HNHM): VIETNAM: Bac Kan Prov., Ba Be NP, Na Mam, forest in the gorge behind the NP HQ, sweeping, Apr 17–18, 2010 – 22.417137° N 105.632505° E, 200 m, VN2010- PL _15, leg. Papp, L., Peregovits, L., Soltész, Z. & Lengyel, G. (right wing on a slide, abdomen and genitalia are kept in a plastic microvial with glycerol).

subventral view. Scales: 0.2 mm for Fig. 8 , 0.1 mm for Figs 9–12

Measurements in mm: body length 2.48, wing length 2.64, wing width 0.97.

Body dark grey (basic colour almost black), partly darker grey microtomentose, all thorax subshiny.

Male.

Frons dull (thick microtomentose). Chaetotaxy as described for family, postvertical and occipital setulae indistinct (fine and short). Pedicel and scape dirty yellow, pedicel with a long (0.12 mm) dorsal seta. First flagellomere dark grey, about as long as broad (0.14 mm). Arista with short (0.02–0.022 mm) dorsal rays and somewhat shorter and less numerous ventral rays. Eye large (height/length ratio 1.11), gena narrower than first flagellomere. Several genal setae present, 1 of them large.

For thoracic chaetotaxy, see family and genus description.

Wing greyish without pattern ( Fig. 34 ), veins light brown. Costa with long thick setae, particularly 2 pairs of very strong setae anterior to posthumeral break (0.15 mm, Fig. 2 ); at least 3 strong setae also on dorsal surface on section distal to subcostal break. Third costal section 0.105 mm, fourth section 0.325 mm, inter-crossvein section of M 1+2 0.33, terminal section of M 1+2 1.04 mm. Basal medial cell 0.187 mm, discal cell 0.813 mm. Terminal section of vein M 3+4 0.325 mm. Alula minute, c. 0.21× 0.05 mm with 10 marginal ciliae of 0.07–0.08 mm long. Calypters very small, thoracic calypter hardly discernible, alar calypter with sparse dark setulae. Halter ochreous.

Legs ochreous, medial ¾ of femora darker brown. No dorsal preapicals on tibiae. First femur with a posteroventral row of long setae plus 1 strong anterodorsal at apical ¾. Mid tibia with a strong ventro-apical seta. Claws simple, thin curved, pulvilli large plumose.

Abdomen 1.31 mm long, with longest discal setae on tergites 0.3 mm long. Male postabdomen ( Fig. 1 ) very small as described for family above. Postabdomen and genitalia are not visible from the dorsal side (resembling to the situation with males of Ephydridae and Camillidae ). Tergite 5 is 0.45 mm long (i.e. 1/3 of the abdomen, remarkable if compared to the whole body length), with 3 pairs of extremely long (0.3 mm) thick setae and several shorter setae. Sternite 5 small narrow subrectangular, 0.14 mm long and only 0.06 mm broad. Postabdomen at most 0.26 mm and shorter than broad. Spiracle pairs of the 5th and 6th segments are clearly seen in the membrane, no more spiracles are discernible.

Postabdominal pregenital sclerites (sternite 6, sternite 7, probably tergites 6 and 7, and the largest dorsal part represented by sternite 8, Figs 3–5 ) forming narrowly open (on the left ventral side) very short ring. Its dorsal part (sternite 8?) only 0.05 mm long (!), longest measurement of postabdomen (sub-ventrally) 0.11 mm.

Male genitalia as described for family, not extendible, in mating position epandrium moves ventrally. Ejaculatory apodeme ( Fig. 10 ) comparatively large, 0.17 mm long, fan-shaped but also with basal part broad.

Female unknown.

Etymology. The specific epithet ‘significans’ means important, referring to the outstanding status of the species.

Figures

Figs 8–12. Circumphallus significans sp. n., holotype male. 8 = phallus and contours of epandrium, 9 = basal part of phallus and medial part of its second circle in higher magnification, 10 = ejaculatory apodeme, broadest view, 11 = hypandrial plates with basiphallus and contours of epandrium, surstyli and base of phallapodeme ventral view (dashed: insertion surface of phallapodeme and distiphallus/basiphallus), 12 = phallapodeme with edges of surstyli and contours of basiphallus, in its broadest, i.e.

Figs 33–35. Circumphallus significans sp. n., holotype male. 33 = habitus; photo taken before abdomen was removed; 34 = right wing; 35 = abdomen, lateral view

Figs 1–2. Circumphallus significans sp. n., holotype male. 1 = 5th abdominal segment and postabdomen with genitalia(ejaculatory apodeme and distiphallus omitted, surstyli schematic), 2 = humeral

Figs 3–7. Circumphallus significans sp. n., holotype male. 3 = all postabdominal sclerites (syntergosternite) in the view, when dorsal part is at widest, 4 = postabdominal sclerites (syntergosternite), left lateral view, 5 = same, right lateral view, 6–7 = surstylus: 6 = subanterior-sublateral view, 7 = apical