Oxysarcodexia rimata, 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 : 93-94

Oxysarcodexia rimata sp. n.

( Figs 237–240 )

urn:lsid:zoobank.org:act:BFE15C27-0EDF-4C5A-A64B-D6FC16FC81D6

Diagnosis. Postocular plate with pale golden pollinosity. Ocellar bristles equal in size to uppermost frontal bristles. Thorax dark with pale golden pollinosity slightly more intense on sides. Two well-differentiated posterior and 2 smaller anterior post-sutural dorsocentral bristles; apical scutellar bristles present. Legs dark brownish. Abdomen with golden pollinosity except ST2 with silvery pollinosity. T3 with 1 pair of marginal lateral bristles, T4 with 1 pair of marginal lateral and 1 pair of median marginal bristles. ST5 with deep median cleft with margins almost parallel. Cercus straight in lateral view, with darker, backward-curving apical expansion; cerci with tips slightly diverging in posterior view. Pregonite broad, curved, with pointed apex; unicolorous. Postgonite slender, slightly curved, with pointed apex; unicolorous. Distiphallus apex curved at an obtuse angle. Juxta bifurcated, rugose laterally, smooth ventrally and knurled apically. Vesica symmetrical, well sclerotized, small, knurled along margins, with short, almost flat triangular branches in anterior view.

Description. Male. Length 7.50 mm.

Head. Fronto-orbital, parafacial and postocular plates with pale golden pollinosity; occiput blackish with silvery pollinosity, black bristles in dorsomedial and lateral areas and a few golden bristles in ventromedial area; frons 0.06x head width at level of ocellar triangle; frontal vitta blackish, with row of 10–11 frontal bristles; inner vertical bristle well developed, outer vertical bristle 0.43x as long as the inner one and as long as a postocellar bristles; ocellar bristles equal in size to uppermost frontals; reclinate fronto-orbital bristles 1.6x as long as frontals, proclinate bristles absent; gena and postgena blackish, respectively with golden and silvery pollinosity and both with black bristles; antenna blackish, first flagellomere with pale golden pollinosity and about 2x as long as pedicel; arista dark brown and long plumose on proximal 3/4; palpus dark brown.

Thorax. Dark with pale golden pollinosity slightly more intense on sides. Chaetotaxy: acrostichals 0+1, dorsocentrals 4 (first and third weaker) + 4 (first and second weaker), intra-alars 2+2, supra-alars 2+3, postalars 2, postpronotals 3, notopleurals 4 (2 large primaries and 2 smaller subprimaries), katepisternals 3 with middle one weaker and inserted slightly below others, meropleurals 7–8, postalar wall setose, scutellum with 1 basal, 1 discal, 1 lateral, 1 subapical and 1 apical bristle; prosternum with few bristles along margins. Wing. Hyaline, tegula black, vein R 1 bare, vein R 4+5 setulose over 2/3 of distance to crossvein r-m, costal spine not differentiated and third costal sector without ventral setulae. Legs. Dark brownish, fore femur with rows of bristles on dorsal, posterodorsal and anteroventral surfaces; fore tibia with 1 dorsal, 2 anterodorsal, 2 posterodorsal and 1 posteroventral bristles; mid femur with 4 median anterior and 2 pre-apical posterior bristles, 4 long anteroventral and 4 long posteroventral bristles, and a ctenidium of flattened spines on distal posteroventral surface; mid tibia with 2 posterodorsal, 1 posterior, 1 posteroventral, 1 anteroventral and 1 anterodorsal bristles; hind femur with 1 dorsal, 1 posterior and 7 anterodorsal bristles, anteroventral and anterodorsal rows of long bristles, and apical row of posteroventral bristles; hind tibia with 1 anterior, 2 anteroventral, 3 anterodorsal, 1 dorsal and 2 posterodorsal bristles; fore and hind tarsomeres with weak ventral golden pollinosity.

Abdomen. Brownish with golden pollinosity; ST2 with silvery pollinosity. T3 with 1 pair of lateral marginal bristles, T4 with 1 pair of lateral marginal and 1 pair of median marginal bristles, T5 with 24 strong marginal bristles. ST2–4 square with 1 pair of strong bristles on posterior margin and scattered setulae; ST5 with deep median cleft with margins almost parallel. Terminalia . Syntergosternite 7+8 brownish-yellow with golden pollinosity, scattered short black setulae and 8 marginal bristles. Epandrium brownish-yellow with sparse golden pollinosity and short black setulae. Surstylus oblong, elongate, with sparse marginal and discal setulae and a long and slender light yellow bristle at apex. Cercus straight in lateral view, with darker, backward-curving apical expansion; cerci with tips slightly diverging in posterior view. Pregonite broad, curved, with pointed apex; unicolorous. Postgonite slender, slightly curved, with pointed apex; unicolorous. Distiphallus with apex curved at an obtuse angle. Juxta bifurcated, rugose laterally, smooth ventrally and knurled apically. Vesica well sclerotized, small, knurled along margins, with short and almost flat triangular branches in anterior view.

Female. Unknown.

Etymology. From the Latin rima = cleft, slit. The specific epithet is an adjective referring to the cleft or slit-like gap between the vesica and the angular distal part of the distiphallus in lateral view ( Fig. 238 ).

Remarks. See under O. admixta .

Distribution. NEOTROPICAL. Ecuador.

Biology. Unknown.

Type material. Holotype ♂: ECUADOR: Napo Province: Yasuní National Park: Yasuní Research Station : 76°36′W 00°38′S: 3–20 XI 1998: T. Pape & B. Viklund / NRM-DIPT 0014488 [ MZPUCE].

Figures

FIGURES 237–243. Oxysarcodexia spp., males. 237–240. Oxysarcodexia rimata sp. n., holotype (Ecuador, Napo Province, MZPUCE). 237. Habitus, lateral view. 238. Terminalia, lateral view. 239. Terminalia, posterior view. 240. Terminalia, ventroapical view. 241–243. Oxysarcodexia riograndensis Lopes (Brazil, São Paulo, Campinas, LIE). 241. Habitus, lateral view. 242. Terminalia, lateral view. 243. Terminalia, posterior view.