Pachycerina gabela, Davies & Miller, 2009

Davies, Gregory B. P. & Miller, Raymond M., 2009, Revision of Afrotropical Pachycerina Macquart (Diptera: Lauxaniidae), African Invertebrates 50 (2), pp. 295-295 : 310

Pachycerina gabela sp. n.

Figs 26 , 32 , 41

Etymology: Named after the type locality. Gabela is a celebrated area of faunal endemism centered on the subtropical escarpment forests in north-western Angola.

Diagnosis: Identifiable by its black abdomen (both sexes), absence of any T6 spots and shape of male S5. P. gabela is the only mainland African species to lack the paired T6 spots. Other features are the large black ocellar spot, large black prefrontal spots, long yellow postpedicel, very faintly infuscated scape and pedicel, and that only the protarsus is darkened.

Description:

Head: Prefrontal spots large and black. Ocellar spot large and black. Fronto-orbital plates not infuscated. Postpedicel yellow, scape and pedicel light orange.

Thorax: Acrostichal, dorsocentral and presutural vittae present (pattern indistinct on holotype). Scutellum yellow, no stripes. Upper and lower lateral vittae present. Profemur and protibia yellow, protarsus blackish. Other legs yellow. Wing with faint infuscation in costal cell, stigma and marginal cell. Haltere yellow-orange, slightly darkened knob. Abdomen: Black, but syntergite 1+2 with slight yellow tinge.

Male terminalia ( Figs 26 , 32 , 41 ): S5 with straight posterior processes and medial spur. T6 without paired spots. Surstyli fairly short (slightly longer than epandrium). Gonopods asymmetric, left gonopod slightly shorter than right gonopod. Both gonopods with lateral spinules.

Measurements: ơ (n=2), ^(n=2): head length – ơ 0.8, ^0.7; thorax length (incl. scutellum) – ơ 2.1 (2.0–2.1), ^1.9; abdomen length – ơ 1.8, ^1.8 (1.7–1.9); wing length – ơ 3.7, ^3.5.

Holotype: ơ ANGOLA: Cuanza Sol : 7 miles west of Gabela [10°48'S: 14°25'E], 16–18.iii.1972 ( BMNH) . Other material examined: ANGOLA: 2ơ 2^same data as holotype ( BMNH) ; 2ơ 3 miles south-west of Salazar , 15.iii.1972 ( BMNH) ; 1ơ 1^Salazar , 9–15.iii.1972 ( BMNH) . SOUTH AFRICA: Limpopo: 1ơ Mariepskop [24°31'S: 30°52'E], 8.iv.1964 ( NMSA) ; Ofcolaco [24°06'S: 30°23'E], Selati R., 7–8.xii.1976, R.M. Miller ( NMSA) .

Figures

Figs 23–27. Posterior view of male terminalia: (23) Pachycerina stuckenbergi sp. n.; (24) Pachycerina vaga Adams; (25) Pachycerina crinicornis (Thomson); (26) Pachycerina gabela sp. n.; (27) Pachycerina micropunctata sp. n. Scale bar = 0.8 mm.

Figs 28–33. Dorsal view of male inner genitalia: (28) Pachycerina obscuripennis Lamb; (29) Pachycerina potentilla sp. n.; (30) Pachycerina stuckenbergi sp. n.; (31) Pachycerina atrimela sp. n.; (32) Pachycerina gabela sp. n.; (33) Pachycerina pellocera sp. n. Abbreviation: aed apo – aedeagal apodeme. Scale bar = 0.5 mm.

Figs 39–48. Sternite 5 of male Pachycerina species: (39) P. vaga Adams; (40) P. nigrivittata sp. n.; (41) P. gabela sp. n.; (42) P. atrimela sp. n.; (43) P. pellocera sp. n.; (44) P. stuckenbergi sp. n.; (45) P. crinicornis (Thomson); (46) P. potentilla sp. n.; (47) P.seychellensis Lamb; (48) P. micropunctata sp. n. Abbreviation: post proc – posterior process. Scale bar = 0.5 mm.