Oxysarcodexia xon ( Dodge, 1968 )

Menezes, Marco Antônio, Santos, Josenilson Rodrigues dos & Patiu, Cátia Antunes de Mello, 2020, A new flesh fly species of Oxysarcodexia Townsend from the Brazilian Atlantic Forest and redescription of Oxysarcodexia xon (Dodge, 1968), Papéis Avulsos de Zoologia (Pap. Avulsos Zool., S. Paulo) 60, pp. 1-11 : 5-10

Oxysarcodexia xon ( Dodge, 1968)

( Figs. 4 A‑D, 5A‑F)

Xarcophaga xon Dodge, 1968:449 . Type locality: Panama, Barro Colorado Island.

Oxysarcodexia xon ; Lopes, 1975a; Pape, 1996.

Xarcophaga xon ; Lopes, 1982.

References: Lopes (1975a, moved to Oxysarcodexia Townsend ); Lopes (1982, revalidation of the genus); Pape (1996, catalog); Mello-Patiu et al. (2009, checklist).

Type‑material: Holotype ♂ ( KU) [type examined through digital photographs]. “Barro Colorado I[island] / Canal Zone, Panama / 19.ii.1956 No. / C.W and M.E. Rettenmeyer [printed on white paper]” // “ Xarcophaga / xon / HOLOTYPE [surrounded by a red line] / Det. H. R. Dodge 1964 [handwritten on white paper]”. Condition of holotype: good condition, terminalia dissected and glued in a white cardboard, vesica partially broken at the left side. Additional examined material ( MNRJ): Brazil: 5 ♂ and 1 ♀: Rio de Janeiro, Itatiaia, v.1966, breeding 769, R. P. Mello col. [lost]; 1 ♂: Rio de Janeiro, Itatiaia , ii.1941, P.Wichart col. [lost]; 1 ♂: Rio de Janeiro,Itatiaia, D. Albuquerque col.[lost]; 1 ♂: Santa Catarina, NovaTeutônia [Seara], 27°11′S, 52°23′W, 18.i.1940, Fritz Plaumann col. [lost]; 1 ♂: Rio de Janeiro, Itatiaia, P.N. Itatiaia, Rui Braga Trail , 1198 m, 22°26′09.1″S / 44°37′31.2″W, 12-18.iii.2017, Van Someren,shrimp,Nihei etal. col.( MNRJ-ENT1-32068 ).

Diagnosis: Male cercus with a pointed apex slightly curved forward, in lateral view ( Figs. 4A , 5C ), anterior juxtal margin serrate, forming median expansions with serrate edges, and extending upward as elongated and narrow projections ( Figs. 4 C-D, 5C, 5E), and vesica beret-shaped, in lateral view, with a pair of basolateral squamous small lobes, in ventral view ( Figs. 4 C-D).

Redescription: Male (n = 9). Length: 7-11 mm.

Head: Parafacial, fronto-orbital plate and posterior ocular orbits dark brown with intense golden pruinosity ( Figs. 5 A-B); parafacial with a row of setulae close to the eye; face with golden pruinosity; facial ridge dark brown with short setulae in the inferior half; frons about 0.22-0.25x head width at level of ocellar triangle; frontal vitta brownish; 8-11 well-developed frontal setae reaching the apex of pedicel, reclinate orbital seta present and more developed than the largest frontals, proclinate orbitals setae absent; ocellar setae as developed as the upper frontals; postocellar setae and paravertical setae of same size of the ocellar setae; inner vertical seta 3X the outer one; gena with golden pruinosity and black setae ( Fig. 5A ); postgena gray slightly silvery pruinose with a few black setae anteriorly and pale setae in the rest; post-cranium with two rows of black occipital setae on upper part and pale setae below; antenna dark brown ( Fig. 5A ), first flagellomere with silvery pruinosity and approximately 2.5x longer than pedicel; arista long plumose on basal ¾; palpus dark brown ( Fig. 5A ). Thorax: Dark brown with golden pruinosity ( Figs. 5 A-B). Chaetotaxy: acrostichals 0+1, dorsocentrals 3+3 (well developed), intra-alars 2-3+2, supra-alars 1-2+3, postpronotals 3, notopleurals 4; postalar wall setulose; postalar callus with 2 setae; scutellum with 3 marginal setae (well developed), a pair of discal and a pair of weak apical setae; katepisternal setae 3, almost in a straight line; meral setae 7-10; proepisternum bare; prosternum setulose. Wing: hyaline with dark brown veins ( Fig. 5B ), tegula blackish, whitish-yellow basicosta, vein R₄₊₅ with dorsal setulae on 3/4 of distance to crossvein r-m, vein R₁ bare, cell r₄₊₅ open at wing margin, costal spine not dif- ferentiated, third costal sector ventrally bare, upper and lower calypter whitish. Legs: dark brown with pulvilli yellowish-brown ( Fig. 5A ); fore femur with rows of dorsal, posterodorsal and posteroventral setae; fore tibia with 2 anterodorsal setae in basal third; mid femur with rows of anterior and anteroventral setae, and a row of setae and a ctenidium of flattened spines in posteroventral margin, 2 preapical posterodorsal setae; mid tibia with 1 median anterior, 1 median posterior and 1 median posterodorsal seta; hind trochanter with normal median-ventral setae; hind femur with rows of anteroventral and anterodorsal setae, 1 preapical posterior and 2 preapical posterodorsal setae; hind tibia with 1 basal third, 1 median and 1 preapical seta in anterodorsal and posterodorsal margins and 1 median anteroventral setae, sometimes with differentiated setae in series between the anterodorsals. Abdomen: Dark brown with silver stains ( Fig. 5A ). T4 with one pair of median marginal setae and 2-3 of lateral marginal setae; T5 with about 16 marginal setae; ST2-4 subsquadrate; ST5 yellowish brown with a median deep cleft. Terminalia: Syntergosternite 7+8 and epandrium yellowish-brown with dorsal golden pruinosity ( Fig. 5C ). Cercus with pointed apex, slightly curved forward in lateral view ( Figs. 4A , 5C ); surstylus with apex more enlarged than base, a short apical projection in posterior margin and setae in apical third ( Figs. 4A , 5C ); postgonite almost straight with a setae in apical third ( Figs. 4C ), which can vary in size among the specimens (median to longer); pregonite similar in size to postgonite, broad, with a blackish and slightly curved apex ( Fig. 4C ); phallus well sclerotized, elongated and apically enlarged, basiphallus and distiphallus fused, with a ventral desclerotized band ( Fig. 2C ); lateral triangular extension of the paraphallus poorly extended ( Figs. 2C ); juxta yellowish and partially membranous, anterior juxtal margin serrate, forming median expansions with serrate edges, and extending upward as elongated and narrow projections ( Figs. 4 C-D, 5C, 5E); vesica very pale and membranous, beret-shaped in lateral view and general rectangular format, with a pair of basolateral small lobes, in ventral view ( Figs.4 C-D,5C, 5E); median stylus with enlarged and subquadrangular base and narrow apex ( Fig. 4D ); lateral stylus slightly longer than median stylus with base weakly curved towards lateral ( Fig. 4D ).

Female (n= 1).Length: 8mm.Differs from male as follows:

Head: Frons about 0.28x head width at level of ocellar triangle; 2 proclinate orbital setae similar to or slightly shorter than the reclinate orbitals; outer vertical seta slightly shorter than the inner one. Thorax: Mid femur without ctenidium. Abdomen: T5 with about 14 marginal setae; posterior margin ventrally opened ( Fig. 5F ). Terminalia: T6 divided as two short plates largely separated from each other, with a broad area between them and the posterior margin of T5, internal margin of the plates with a row of strong marginal setae ( Fig. 5F ); spiracles 6 in the intersegmental membrane and spiracles 7 in tergal plate; T7 and T8 absent; ST6 with numerous marginal setae; ST7-ST8 fused, ST7 with some posterior setae; ST8 short with a rounded and setose apical area; epiproct membranous with one pair of setae; hypoproct broad with long setae; cercus large and rounded.

Distribution: Brazil (Rio de Janeiro, Santa Catarina *); Panama.

Remarks: Oxysarcodexia xon closely resembles O. digitata sp. nov., O. nitida Soares & Mello-Patiu and O. notata Soares & Mello-Patiu , since both are more similar in shape of the surstylus and vesica, but differs from other species by the cercus end pointed and end pointed and slightly curved forward in lateral view ( Figs. 4A , 5C ), pregonite short and broad ( Fig. 4C ), anterior juxtal margin serrate, forming median expansions with serrate edges, and extending upward as elongated and narrow projections ( Figs. 4 C-D, 5C, 5E), and vesica small with squamous lobes ( Figs. 4 C−D, 5E).

Figures

Figure 2. Oxysarcodexia digitata sp. nov. (female paratype from Itatiaia, MNRJ). (A-B) ST2-5 and terminalia, ventral view. (C) Spermathecae, lateral view. Abbreviations:ce,cercus;hy, hypoproct;sp,spiracle;ST, sternite;T, tergite;vp, vaginal plate.Scale bars = 0.2 mm.

Figure 4. Oxysarcodexia xon (Dodge),(male specimen from Itatiaia,MNRJ).(A) Epandrium,cercus and surstylus,lateral view.(B) Cercus,posterior view.(C) Phallus and associated structures, lateral view. (D) Phallus ventral view. Abbreviations: ajm, anterior juxtal margin; bp, basiphallus; ce, cercus; dp, distiphallus; j,juxta; ls, lateral stylus;ms, median stylus;po,postgonite;pr,pregonite;su, surstylus;ve, vesica.Scale bars = 0.4 mm.

Figure 5. Oxysarcodexia xon (Dodge) (male specimen from Itatiaia, MNRJ). (A) Habitus, lateral view. (B) Habitus, dorsal view. (C) Terminalia, lateral view. (D) Terminalia,posterior view.(E) phallus, ventral view. (F) Oxysarcodexia xon (Dodge) (female specimen from Itatiaia,MNRJ), abdomen,ventral view. Scale bars: (A-B) 4 mm;(C-D,F) 0.8 mm;(E)0.4 mm.