Oxysarcodexia graminifolia, 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 : 60-61

Oxysarcodexia graminifolia sp. n.

( Figs 135–138 )

urn:lsid:zoobank.org:act:5B61D215-64FF-4F6B-8068-6469D96E0DCE

Diagnosis. Postocular plate with golden pollinosity. Ocellar bristles equal in size to uppermost frontal bristles. Thorax grayish with pale or dark golden pollinosity, more intense laterally. Five dorsocentral bristles; apical scutellar bristles present. Legs blackish brown. Abdomen with golden pollinosity. T1+2 with silvery pollinosity, T3 with 1 pair of marginal lateral bristles, T4 with 1 pair of lateral marginal and 1 pair of median marginal bristles. ST5 with deep median cleft with margins almost parallel. Cercus straight in lateral view, with a darker apical expansion. Cerci in posterior view mostly parallel, with slightly diverging tips. Postgonite slender, slightly curved, with 1 bristle approximately 2/3 from base and square apex; unicolorous. Pregonite broader, curved and with sharp apex; unicolorous. Distiphallus with oval apex. Juxta bifurcated, rough laterally and smooth ventrally. Vesica well sclerotized and well developed, with ventrobasal projection, slightly curved dorsally, with blade-like branches in anterior view and spines on dorsal surface (absent ventrally).

Description. Male. Length 8.3–8.5 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 0.08x 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 not differentiated; ocellar bristles equal in size to uppermost frontals; reclinate fronto-orbital bristles present, of variable length (1.0–1.3x as long as frontals), proclinate bristles absent; gena and postgena black, respectively with golden and silvery pollinosity and both with black bristles; antenna dark brown, first flagellomere with brownish pollinosity and about 2x as long as pedicel; arista brown with middle portion lighter and long plumose on proximal 3/4; palpus dark brown.

Thorax. Grayish with lightly pale or stronger golden pollinosity, more intense laterally. Chaetotaxy: acrostichals 0+1, dorsocentrals 3+5, 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 8–9, postalar wall setose, scutellum with 1 basal, 1 discal, 1 lateral, 1 subapical and 1 apical bristle; prosternum setose on distal 2/3. 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, third costal sector without ventral setulae. Legs. Blackish brown; fore femur with rows of bristles on dorsal, posterodorsal, and posteroventral surfaces; fore tibia with 1 strong and 3 weaker anterodorsal, 1 dorsal, 1 posterior and 1 posteroventral bristles; mid femur with 5 median anterior and 2 preapical posterior bristles, 5 long anteroventral and 6 posteroventral bristles, a ctenidium of flattened spines on distal posteroventral surface; mid tibia with 2 anterodorsal, 1 posterodorsal, 1 posteroventral and 1 anterodorsal bristles; hind femur with 1 strong pre-apical dorsal and 1 posterodorsal bristle, anteroventral and anterodorsal rows of long bristles, and 1 posteroventral row of bristles up to approximately distal 1/3; hind tibia with 2 anteroventral, 1 dorsal, 2 posterodorsal and 3 anterodorsal bristles; tarsi with weak ventral golden pollinosity.

Abdomen. Dark brownish with golden pollinosity except T1+2 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 17–23 strong bristles along posterior margin. ST2–4 oblong with scattered setulae, stronger along margins; ST5 with deep median cleft with margins almost parallel. Terminalia . Syntergosternite 7+8 brownish-yellow with golden pollinosity, scattered short black setulae and 8–10 marginal bristles. Epandrium yellowish with golden pollinosity and black bristles. 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 in posterior view mostly parallel, with slightly diverging tips. Postgonite slender, slightly curved, with 1 bristle approximately 2/3 from base and square apex; unicolorous. Pregonite broader, curved and with sharp apex; unicolorous. Distiphallus with oval apex. Juxta bifurcated, rough laterally and smooth ventrally. Vesica well developed and well sclerotized, with ventrobasal projection with slightly dorsally-curved apex; distal lobes with blade-like branches in anterior view and spines on dorsal surface (absent ventrally).

Female. Unknown.

Etymology. The specific epithet, which should be treated as a noun in apposition, is formed by combining the Latin words gramin = grass; and folia = leaf, and is given in recognition of the blade-like shape of the vesica ( Fig. 136 ).

Remarks. See remarks under O. amorosa .

Distribution. NEOTROPICAL. Colombia, 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 0014467 [ MZPUCE] // paratype ♂ : COLOMBIA: Amazonas PNN Amacayacu , Camino a San Martin; 3°41′N 70°15′W; 1–10.iii.2004, sweepnet; T . Pape & D. Arias. Id# 4325 / NRM-DIPT 0014650 [NRM].

Figures

FIGURES 132–138. Oxysarcodexia spp., males. 132–134. Oxysarcodexia galeata (Aldrich) (USA, Alabama, Madson Co., NRM). 132. Habitus, lateral view. 133. Terminalia, lateral view. 134. Terminalia, posterior view. 135–138. Oxysarcodexia graminifolia sp. n., holotype (Ecuador, Napo Province, MZPUCE). 135. Habitus, lateral view. 136. Terminalia, lateral view. 137. Terminalia, posterior view. 138. Terminalia, ventroapical view.