Oxysarcodexia digitata, Menezes & Santos & Patiu, 2020

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 : 2-5

publication ID	https://doi.org/ 10.11606/1807-0205/2020.60.43
publication LSID	lsid:zoobank.org:pub:695B7AC9-3298-4995-BEF8-A8F566A9F492
persistent identifier	https://treatment.plazi.org/id/03A7878D-FFA9-BB61-40B9-85B0FD829E56
treatment provided by	Carolina
scientific name	Oxysarcodexia digitata
status	sp. nov.

Treatment

Oxysarcodexia digitata View in CoL sp. nov.

( Figs. 1 View Figure 1 A‑D, 2A‑C, 3A‑F)

Type‑material: Holotype ♂ ( MNRJ): “ Brasil, RJ, Itatiaia, P.N. [ Parque Nacional ] Itatiaia / Trilha [trail] Rui Braga, 1150 m / 22°25′53.7″S, 44°37′21.3″W / 12-18.iii.2017, Van Someren 2 / peixe [fish], Nihei et al. col. [printed on white paper] // HOLOTYPE [printed on white paper, surrounded by a red line] // Oxysarcodexia digitata n. sp. / Menezes, Santos & Mello-Patiu / 2020 / Det.: Menezes, Santos & Mello- / Patiu 2019 // MNRJ-ENT1-57099 [QR code, printed on white paper]”. Condition of holotype: good condition, terminalia not dissected GoogleMaps . Paratypes ( MNRJ): Brazil: 1 ♂, 3 ♀: São Paulo, Boracéia , 20.iii.1968, breeding 800, H.S. Lopes col. [lost] ; 1 ♂: Rio de Janeiro, Itatiaia , 19-21.vi.1955, Dalcy, Barros & Pearson col. [lost] ; 1 ♂ same data as holotype, except 1149 m, 22°25′59.7″S / 44°27′21.3″W, Van Someren ( MNRJ-ENT1-66650 ) GoogleMaps ; 2 ♂: same data as holotype ( MNRJ-ENT1-57100 and ( MNRJ-ENT1-57101 )) GoogleMaps ; 4 ♂: same data as holotype, except 1198 m, 22°26′09.1″S / 44°37′31.2″W, 12-18.iii.2017, Van Someren,shrimp( MNRJ-ENT1-57102 , MNRJ-ENT1-57103 , MNRJ-ENT1-57104 , MNRJ-ENT1-57105 ). Conditions of preserved paratypes: good conditions, one of them without mid right leg ( MNRJ-ENT1-57100 ), another one without hind left leg, with hind right leg and left wing glued on card ( MNRJ-ENT1-57102 ) and another one without all right legs ( MNRJ-ENT1-66650 ) GoogleMaps .

Diagnosis: Male pregonite with flat triangular projection in the ventral margin ( Fig. 1D View Figure 1 ), postgonite with a short median seta ( Fig. 1D View Figure 1 ) and anterior juxtal margin as peculiar folded digitate lobes ( Figs. 1 View Figure 1 C-D, 3C, 3E), and vesica with four extensions, X-shaped, in ventral view ( Fig. 1C View Figure 1 ). Female T6 divided in two sclerotized plate ( Figs. 2 View Figure 2 A-B), T8 absent, ST8 short, with a rounded, setose, and poorly delimited apical area ( Fig. 2A View Figure 2 ), and vaginal plate membranous and poorly delimited ( Fig. 2B View Figure 2 ).

Description: Male (n = 10). Length: 10-12 mm.

Head: Parafacial, fronto-orbital plate and posterior ocular orbits dark brown with intense golden pruinosity ( Figs. 3 View Figure 3 A-B); parafacial with a row of setulae close to the eye; face with golden slightly silvery pruinosity; facial ridge dark brown with short setulae in the inferior half; frons about 0.23-0.24x head width at level of ocellar triangle;frontal vitta brownish; 9-11 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; 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. 3A View Figure 3 ), first flagellomere with silvery pruinosity and approximately 2.5x longer than pedicel; arista long plumose on basal ¾; palpus dark brown ( Fig. 3A View Figure 3 ). Thorax: Dark brown with silvery gray pruinosity, but golden in the lateral stripes ( Figs. 3 View Figure 3 A-B). Chaetotaxy: acrostichals 0+2, dorsocentrals 3+3 (well developed), intra-alars 3+2, supra-alars 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 8-9; proepisternum bare; prosternum setulose. Wing: hyaline with dark brown veins ( Figs. 3 View Figure 3 A-B), 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 differentiated, third costal sector ventrally bare, upper and lower calypter whitish. Legs: dark brown with pulvilli yellowish-brown ( Fig. 3A View Figure 3 ); fore femur with rows of dorsal, posterodorsal and posteroventral setae; fore tibia with 3 anterodorsal setae in basal third and 1 posterior setae in the apical 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. Abdomen: Dark brown with silver stains ( Figs. 3 View Figure 3 A-B). T4 with one pair of median marginal setae and 2-3 of lateral marginal setae, T5 with about 14 strong 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. 3C View Figure 3 ). Syntergosternite 7+8 with 4 pairs of well-developed setae in posterior margin; epandrium with setae more developed in dorsal margin. Cercus with numerous long setae in cercal base, cercal prong widely covered of pale microtrichia, with short and sparse setae, apex slightly curved outside ( Figs. 1 View Figure 1 A-B, 3C-D); surstylus pyriform, with setae in apical third ( Figs. 1A View Figure 1 , 3C View Figure 3 ); postgonite almost straight with slightly spatulate and curved apical end and a short median seta ( Fig. 1D View Figure 1 ); pregonite slightly curved, larger and wider than postgonite, with a blackish apex and a flat triangular projection in the ventral margin ( Fig. 1D View Figure 1 ); phallus well sclerotized, elongated and apically enlarged, basiphallus and distiphallus fused, with a ventral desclerotized band ( Fig. 1D View Figure 1 ); lateral triangular extension of the paraphallus poorly extended ( Figs. 1D View Figure 1 , 3C View Figure 3 ); apical portion of paraphallus and juxta folded backwards, juxta yellowish and partially membranous, anterior juxtal margin forming lobes with conspicuously digitate edges ( Figs. 1 View Figure 1 C-D, 3C, 3E); vesica X-shaped in ventral view, composed by two portions in lateral view, distal portion sub-triangular and less sclerotized and proximal one slender and curved ( Figs. 1 View Figure 1 C-D, 3C); median and lateral styli apically displaced and very short ( Fig. 1C View Figure 1 ).

Female (n = 3): Length: 8-9 mm. Differs from male as follows:

Head: Frons about 0.18-0.20x 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 numerous marginal setae; posterior margin ventrally closed ( Fig. 3F View Figure 3 ). Terminalia: T6 divided as two plates dorsally broad and membranous on midline, posterior margin with a row of stronger marginal setae ( Figs. 2 View Figure 2 A-B); spiracle 6 in the intersegmental membrane and spiracle 7 in tergal plate ( Figs. 2 View Figure 2 A-B); T7 and T8 absent; ST6-8 fused ( Figs. 2 View Figure 2 A-B); ST6 with numerous marginal setae ( Figs.2 View Figure 2 A-B);ST7 about 2X the ST6 length, with numerous setae in the posterior margin ( Figs. 2 View Figure 2 A-B); ST7−ST8 fused, without a clear delimitation, ST8 short, with a rounded and setose apical area ( Figs. 2 View Figure 2 A-B); epiproct membranous with one pair of setae; hypoproct broad with long setae ( Figs. 2 View Figure 2 A-B); cercus broad and rounded ( Figs. 2 View Figure 2 A-B); vaginal plate membranous and poorly delimited ( Figs. 2 View Figure 2 A-B); spermathecae oval and striated ( Fig. 2C View Figure 2 ).

Distribution: Brazil (Rio de Janeiro, São Paulo).

Etymology: The species epithet is derived from the Latin digitata (adjective, feminine), meaning fingers, in allusion to the ornamentation of anterior juxtal margin in the phallus, which forms a digitate lobe.

Remarks: Oxysarcodexia digitata sp. nov. is morphologically similar to O. fraterna Lopes , O. nitida Soares & Mello- Patiu, O. notata Soares & Mello-Patiu , O. vittata (Walker) , and O. xon . The male terminalia of these species have postgonite with a short median seta, unlike most species of Oxysarcodexia that show long median seta, and the anterior juxtal margin with serrate or digitate edge, not straight. It differs from other species by the peculiar pregonite with a flat triangular projection in the ventral margin ( Fig. 3D View Figure 3 ), the anterior juxtal margin with an edge conspicuously digitate ( Figs. 1 View Figure 1 C-D, 3C, 3E) and the vesica X-shaped in ventral view ( Figs. 1 View Figure 1 C-D, 4C).