Pachycerina obscuripennis Lamb, 1912

Davies, Gregory B. P. & Miller, Raymond M., 2009, Revision of Afrotropical Pachycerina Macquart (Diptera: Lauxaniidae), African Invertebrates 50 (2), pp. 295-295 : 314

Pachycerina obscuripennis Lamb, 1912

Figs 20 , 28

Pachycerina obscuripennis: Lamb 1912: 308 . Type locality: Mare-aux-Cochons forest , Silhouette Island, Seychelles.

The type is a male mounted on cork and is in reasonable condition (e.g., all antennae and legs intact). Lamb’s description is good and relevant features of this species are: (1) prefrontal spots large and black, (2) postpedicel mainly yellow except for dark brown base, (3) scape and pedicel dark brown, (4) ocellar spot rather small, (5) fronto-orbital plates weakly infuscated, (6) scutal vittae replaced by two broad, dark brown longitudinal bands separated by a thin, medial, longitudinal yellow vitta (this colour pattern not the result of postmortem discoloration), (7) scutellum all dark brown except for yellow edges, (8) mesopleuron orange with dark brown upper lateral vitta, (9) sternopleuron completely infuscated dark brown, (10) profemur yellow-orange with blackish mark apically, (11) protibia and protarsus black (apex of protibia with ring of yellow), (12) wing strongly infuscated especially stigma and costal, marginal and submarginal cells, (13) abdomen all black with no T6 spots. The species is still only known from the holotype. We have dissected out the terminalia which Lamb (1912) did not describe. Male terminalia ( Figs 20 , 28 ): S5 lost in dissection. No T6 spots. Surstyli about as long as the epandrium. Gonopods asymmetric, gonopods about equal in length, left gonopod damaged in dissection and artificially truncated. Both gonopods with lateral spinules. Aedeagal apodeme short and anteriorly rounded, tapering posteriorly.

Holotype (examined): ơ SEYCHELLES: Silhouette I., forest above Mare-aux-Cochons 1908, J.S. Gardiner ( BMNH).

Figures

Figs 17–22. Posterior view of male terminalia: (17) Pachycerina potentilla sp. n.; (18) Pachycerina pellocera sp. n.; (19) Pachycerina atrimela sp. n.; (20) Pachycerina obscuripennis Lamb; (21) Pachycerina seychellensis Lamb; (22) Pachycerina nigrivittata sp. n.Abbreviations: pro – protandrium, epa – epandrium, sur – surstylus. 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.