Aphaniosoma gaiasicum, 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 : 400-401

Aphaniosoma gaiasicum sp. n.

Fig. 45

Etymology: The species name is derived from Gai-As, the type locality.

Diagnosis: Yellow species with 2 pairs of setulae on fr longer than others, dark spot on meron, pale brown stripes on scutum, tarsomeres of all legs yellow and shiny brown spot on ep contrasting with otherwise entirely yellow abdomen. Male postabdomen with distinctive long narrow lobes of distiph and flattened upturned process on basiph.

Description:

Male.

Head: Yellow, including oc triangle only ocelli ringed black, fr broad but converging anteriorly so that at level of antennae it is about 0.7 as wide as at level of anterior oc, face small, depressed and with distinct, narrow but low facial carina, eye oval lying oblique, gena yellow, at middle about 0.6 height of eye and having several yellow setulae, 2 short setae at vibrissal corner, mouthparts yellow, 4 setulae on fr with 1 pair of longer setulae above lunule and another in front of oc triangle, 3 orb with 1 short setula in front, 1 vti and 1 vte, pvt distinct and convergent, ocellars long, divergent, antenna yellow, most of second segment of arista dark.

Thorax: Scutum and scut with yellow ground but with pale brown longitudinal stripes on scutum, mtn brown, pleura all yellow except for a pale brown inverted triangle on lower katepisternum and dark brown spot on meron. Chaetotaxy: 1 pprn, 1 posthu, 1 ihu, 2 ntpl, 0+4 ia, 2+4 acrs, 3+4 dc only the posterior one well-developed, prpl not seen, 1 pa, 2 pairs of marginal scut, 1 katepisternal, 1 anepisternal, all setae pale yellow. Wing: Hyaline and uniformly microtrichose, veins pale yellow, distance between R 2+3 to R 4+5 on costal margin about 0.4 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 yellow.

Legs: Yellow and fine yellow setulose, tarsomere 5 of all legs yellow.

Abdomen: Yellow with narrow, brown anterior margins to all tg.

Postabdomen: Yellow with shining brown ep spot lateral to cerc.

Female.

As male. (Postabdomen not dissected due to poor condition.)

Length: ơ body 1.2 mm, wing 1.4 mm; ^body 1.4 mm, wing 1.5 mm.

Holotype: ơ NAMIBIA: Khorixas District , Gai-As spring, 20°46'01"S: 14°01'12"E, 22.x.1998, A.H. Kirk-Spriggs & E. Marais (in glycerine, NMNW).

Paratypes: 2^in alcohol, same data and depository.

Figures

Fig. 45. Aphaniosoma gaiasicum sp. n., ơ: (a) hypopygium, lateral; (b) st 6, ventral. Scale bar = 0.18 mm.