Aphaniosoma micropygum, Ebejer, 2009

Ebejer, Martin J., 2009, A revision of Afrotropical Chyromyidae (excluding Gymnochiromyia Hendel) (Diptera: Schizophora), with the recognition of two subfamilies and the description of new genera, African Invertebrates 50 (2), pp. 321-321 : 403-405

Aphaniosoma micropygum sp. n.

Figs 48 , 49

Etymology: From Greek micros (small) and Latin pyga (buttocks), and refers to the particularly small hypopygium.

Diagnosis: Yellow species with brown longitudinal stripes on scutum and short pra setula; brown tarsomeres 5; abdomen yellow with tg having brown band along anterior margin, male postabdomen particularly small, yellow and with most structures translucent; lower margin of tg 6 with posterior indentation.

Description:

Male.

Head: Entirely yellow, only ocelli ringed with black; antenna yellow, arista missing, mouthparts yellow; face very small and sunken; gena yellow and pale setulose; gena about 0.6 height of eye, which is long oval and lies almost horizontal. Chaetotaxy: 2 orb and 2 setulae in front of these, 8 scattered short fr setulae and 1 pair of long setae in front of oc triangle; 1 vti and 1 vte and short pvt; postoculars in 1 row.

Thorax: Yellow, with brown longitudinal stripes on scutum, scut yellow, mtn brown, pleura yellow except for brown triangular patch on katepisternum, narrow brown line on anepisternum and anepimeron near suture, meron all brown. Chaetotaxy: 1 pprn, 1 posthu, 1 ihu, 3+4 dc only hindmost developed to a seta, 0+4 acrs, 1+3 ia setulae, 1 pa, 1 anepisternal and 1 katepisternal, latter with vertical row of 4 short setulae down middle of sclerite.

Wing: Hyaline and uniformly microtrichose, veins pale brown to yellow, distance between R 2+3 to R on costal margin about 0.7 that between R 4+5 and M 1+2, distance between crossveins about 1.2× length of posterior crossvein and length of apical section of Cu about 2.8× length of posterior crossvein. Haltere pale yellow.

4+5

Legs: All yellow and yellow setulose, tarsomere 5 brown.

Abdomen: Yellow, with brown bands along anterior half of tg and pale hind margin becoming broader at sides.

Postabdomen: Very small and pale hypopygium; most structures translucent; hyp particularly small and narrow; surs and prg run parallel to each other, surs originating from lower end of ep and prg from posterior end of hyp where this fuses with ep; ep itself small, trapezoidal and invaginated into space within tg 6; pregenital st small and narrow forming loop around ventral hypopygial opening, posteriorly at midline forms a keel in front of distiph.

Female.

Very similar to male. Postabdomen: tg 7 broad with long setulae; tg and st 8 sclerotized and divided, latter of characterisitc shape, st 7 elongate oval with distinct setulae; s with thinly sclerotized first part of duct; cerc small.

Length: ơ and ^body 1.4 mm, wing 1.5 mm.

Holotype: ơ NAMIBIA: Swakopmund [22°40'S: 14°33'E], general sweeping, 26–30.i.1972, Southern African Expedition (W25) B.M. 1972–1 ( BMNH).

Paratypes: 1ơ 7^same data as holotype ( BMNH) .

Figures

Fig. 48. Aphaniosoma micropygum sp. n., ơ: (a) hypopygium, lateral, scale bar = 0.07 mm; (b) st 6, ventral, scale bar = 0.05 mm.

Fig. 49. Aphaniosoma micropygum sp. n., ^postabdomen: (a) ventral, (b) lateral, (c) spermatheca. Scale bar = 0.1 mm.