Oxysarcodexia alectoris, Souza & Pape & Thyssen, 2020

Souza, Carina Mara De, Pape, Thomas & Thyssen, Patricia Jacqueline, 2020, Oxysarcodexia Townsend, 1917 (Diptera: Sarcophagidae) - a centennial conspectus, Zootaxa 4841 (1), pp. 1-126 : 17-19

Oxysarcodexia alectoris sp. n.

( Figs 15–18 )

urn:lsid:zoobank.org:act:1926520F-79A2-4967-B516-15D0CF7C871F

Diagnosis. Postocular plate with golden pollinosity. Ocellar bristles smaller than upper frontal bristles. Thorax grayish with pale golden pollinosity, slightly more intense laterally. Five post-sutural dorsocentral bristles; apical scutellar bristles present. Legs blackish brown. Abdomen with golden pollinosity, more intense laterally. T3–4 with 2 pairs of lateral marginal bristles. ST5 with deep median cleft with margins almost parallel. Cercus straight in lateral view, with a darker apical expansion. Cerci slightly diverging in posterior view. Pregonite broader and longer than postgonite, curved, with pointed apex and expanded base, gradually narrowing to apex; unicolorous. Postgonite slender and only slightly curved, with a square apex and expanded base, gradually narrowing to apex; unicolorous. Distiphallus with rounded apex. Juxta with rugose texture. Vesica well sclerotized; distal lobes resembling chicken wings in anterior view, i.e., turned in a ventroapical direction and with tiny spines along margins and dorsal surface.

Description. Male. Length 6.8 mm.

Head. Fronto-orbital, parafacial and postocular plates with golden pollinosity; occiput blackish with silvery pollinosity, black bristles in dorsomedial and lateral areas and a few golden bristles in ventromedial area; frons 0.1x head width at level of ocellar triangle; frontal vitta blackish, with row of 9–11 frontal bristles; inner vertical bristle well developed, outer vertical bristle 0.2x as long as inner one and as long as a postocellar bristles; ocellar bristles 0.3x as long as frontal bristles; reclinate fronto-orbital bristles equal in size to frontals, proclinate bristles absent; gena and postgena blackish with silvery pollinosity and black bristles; antenna dark brown, first flagellomere with pale golden pollinosity and 3.3x as long as pedicel; arista dark brown, with middle portion lighter and long plumose on proximal 2/3; palpus dark brown.

Thorax. Grayish with pale golden pollinosity, slightly more intense laterally. Chaetotaxy: acrostichals 0+1, dorsocentrals 3+5, intra-alars 2+2, supra-alars 2+2, postalars 1, postpronotals 3, notopleurals 4 (2 large primaries and 2 smaller subprimaries), katepisternals 3 with middle one weaker and inserted slightly below others, meropleurals 7, postalar wall setose, scutellum with 1 basal, 1 discal, 1 lateral, 1 subapical and 1 apical bristle; prosternum bare. Wing. Hyaline, tegula black, vein R 1 bare, vein R 4+5 setulose over 2/3 of distance to crossvein r-m, costal spine small but distinct, third costal sector without ventral setulae. Legs. Blackish brown, fore femur with rows of bristles on dorsal and anteroventral surfaces; fore tibia with 1 dorsal, 1 anterior, 1 anterodorsal and 1 posteroventral bristle; mid femur with 5 median anterior and 2 pre-apical posterior bristles, a ctenidium of flattened spines on distal posteroventral surface and posteroventral and anteroventral rows of long bristles; mid tibia with 1 anterior, 2 anterodorsal, 1 posterodorsal, 1 anteroventral and 1 posteroventral bristle; hind femur with 1 posterodorsal bristle and anteroventral and anterodorsal rows of long bristles; [hind tibia and tarsomeres lost on both sides].

Abdomen. Dark brownish with golden pollinosity, more intense laterally. T3–4 with 2 pairs of lateral marginal bristles; T5 with 20 strong marginal bristles; ST2–4 oblong, with a pair of strong bristles on posterior margin. ST5 with deep median cleft with margins almost parallel. Terminalia . Syntergosternite 7+8 brownish-yellow with sparse golden pollinosity, scattered short black setulae and 9 marginal bristles; epandrium brownish-yellow with sparse golden pollinosity and short black setulae; surstylus triangular with enlarged base and narrow apex, and sparse marginal and discal setulae. Cercus straight in lateral view, with a darker apical expansion; cerci slightly diverging in posterior view. Pregonite broader and longer than postgonite, curved, with pointed apex and expanded base, gradually narrowing to apex; unicolorous. Postgonite slender and only slightly curved, with a square apex and expanded base, gradually narrowing to apex; unicolorous. Distiphallus with rounded apex; juxta with rugose texture; vesica well sclerotized, distal lobes resembling chicken wings in anterior view, i.e., turned in ventroapical direction and with tiny spines along margins and dorsal surface.

Female. Unknown.

Etymology. From the Latin alector (ancient Greek: alektor) = hen or chicken. The specific epithet is an adjective referring to the shape of the distal lobes of the vesica, which in lateral and anterior views is reminiscent of chicken wings.

Remarks. The vesica is similar to that of O. angrensis ( Lopes, 1933) , but O. alectoris sp. n. differs by a rounded apex of distiphallus and cercus with enlarged apex, contrasting with the conical distiphallus apex and pointed cercus of O. angrensis .

Distribution. NEOTROPICAL. French Guiana.

Biology. Unknown.

Type material. Holotype ♂: FRENCH GUIANA: Montsinery ; “Emerald Jungle”; Carrefour du Gallion; 01.i.2003, M. Kotrba / NRM-DIPT 0014601 [ NRM].

Figures

FIGURES 15–24. Oxysarcodexia spp., males. 15–18. Oxysarcodexia alectoris sp. n., holotype (French Guiana, Montsinery, NRM). 15. Habitus, lateral view. 16. Terminalia, lateral view. 17. Terminalia, posterior view. 18. Terminalia, ventroapical view. 19–21. Oxysarcodexia amorosa (Schiner) (Brazil, Rio de Janeiro, Angra dos Reis, MNRJ). 19. Habitus, lateral view. 20. Terminalia, lateral view. 21. Terminalia, posterior view. 22–24. Oxysarcodexia angrensis (Lopes) (Brazil, São Paulo, Campinas, LIE). 22. Habitus, lateral view. 23. Terminalia, lateral view. 24. Terminalia, posterior view.