Oxysarcodexia trivialis ( Wulp, 1895 )

Souza, Carina Mara De, Pape, Thomas & Thyssen, Patricia Jacqueline, 2020, Oxysarcodexia Townsend, 1917 (Diptera: Sarcophagidae) - a centennial conspectus, Zootaxa 4841 (1), pp. 1-126 : 103-104

Oxysarcodexia trivialis ( Wulp, 1895)

( Figs 264–266 )

Sarcophaga trivialis Wulp, 1895: 268 ; 277; Mexico, Guerrero, Tierra Colorada; Mexico, Guerrero, Xucumanatlan; Mexico, Amula; Mexico, Morelos, Cuernavaca; Mexico, Veracruz, Atoyac; Mexico, Tabasco, Teapa. Seventeen male and nine female syntypes in NHMUK (not examined). [Described from “several specimens of both sexes” ( Wulp 1895: 277), and with six different localities mentioned; Aldrich (1930: 32) examined “seventeen males, nine females” that he separated “into ten species ” (his emphasis); Aldrich further stated: “I restrict the species to three males of the last-named group from Amula and one from Atoyac” (p. 33); this restriction, however, is not regulated by the Code.]

Diagnosis. Male. Length 9.0 mm. Postocular plate with golden pollinosity. Ocellar bristles weakly developed. Thorax and abdomen with golden pollinosity, more evident laterally, T5 partly with golden pollinosity. Two welldifferentiated posterior and 1–3 smaller anterior post-sutural dorsocentrals. Apical scutellar bristles present. Legs blackish. T3 with 3 pairs of lateral marginal bristles, T4 with 1 pair of median marginal and 3 pairs of lateral marginal bristles. ST5 with deep median cleft with margins almost parallel and with pilosity and bristles at apex of arms. Cercus sinuous in lateral view, with expanded obliquely cut apex. Cercus with bristles ventrally present at distal third. Cerci with distal third as broad as middle part in posterior view; parallel. Pregonite with expanded base and sudden narrowing at apex, which is darker than base. Postgonite with expanded base, gradually narrowing to apex; unicolorous. Distiphallus with smooth ventroapical margin, rounded apex and straight dorsal outline. Vesica symmetrical, with rounded median projection of main branch; distal lobes well developed, with filaments, tapering, partially membranous, with microscopic spines only on ventral surface.

Remarks. The main characteristic enabling a reliable identification of O. trivialis is the slender vesica, which is partially membranous and with microscopic spines ( Fig. 265 ). See also remarks under O. edwardsi . The female of O. trivialis has an undivided T7 ( Tibana & Mello 1985).

Distribution. NEARCTIC. Mexico (Distrito Federal, Michoacán, Morelos, Puebla), USA (Arizona, New Mexico). NEOTROPICAL. Costa Rica, El Salvador, Guatemala, Mexico (Chiapas, Guerrero, Michoacán, Nuevo León, Sinaloa, Tabasco, Veracruz), Panama.

Biology. Oxysarcodexia trivialis has been bred from human feces ( Howard 1900). It can also be an occasional flower visitor on avocado ( Persea americana Mill. , Lauraceae ) ( Castañeda-Vildózola et al. 1999).

Material examined. [♂] COSTA RICA: Puntarenas, Las Alturas, Cerro Chai , 2100m, 14.viii.1995, Th. Pape leg. [ NHMD] // [♂] COSTA RICA: San José, Rio Savegre, 9km SW route 2, San Gerardo de Dota 2200–2500m, 7–11.viii.1995, Th. Pape leg. [ NHMD] // [♂] TIRIBL—5.1.abril-56 Zel. col. / Oxysarcodexia trivialis (Wulp) Det. H. S. Lopes ♂ [ MNRJ].

Figures

FIGURES 264–273. Oxysarcodexia spp., males. 264–266. Oxysarcodexia trivialis (Wulp) (Costa Rica, Puntarenas, Las Alturas, Cerro Chai, NHMD). 264. Habitus, lateral view. 265. Terminalia, lateral view. 266. Terminalia, posterior view. 267– 270. Oxysarcodexia varia (Walker) (267: Argentina, MACN; 268–269: Argentina, Chubut, NRM; 270: Brazil, Minas Gerais, Extrema, LIE). 267. Habitus, lateral view. 268. Terminalia, lateral view. 269. Distiphallus, anterior view. 270. Terminalia, posterior view. 271–273. Oxysarcodexia ventricosa (Wulp) (USA, Alabama, Madison County, NRM). 271. Habitus, lateral view. 272. Terminalia, lateral view. 273. Terminalia, posterior view. Fig. 267 by P.R. Mulieri (MACN).