Oxysarcodexia berthet Dufek & Mulieri 2017

Oxysarcodexia berthet Dufek & Mulieri, 2017

(Figs 51–53)

Oxysarcodexia berthet Dufek & Mulieri, 2017: 918; Argentina, Chaco. Holotype male (examined from photographs) and one male paratype in MACN; two male paratypes in UNNE.

Diagnosis. Male. Length 8.5–9.9 mm. Postocular plate with silvery pollinosity. Ocellar bristles well developed. Thorax mostly silvery pollinose, with some golden pollinosity on anepisternum. Four well-developed post-sutural dorsocentral bristles. Apical scutellar bristles absent. Legs blackish. Abdomen grayish with silvery pollinosity, contrasting with the golden pollinosity of T5. T3 with 1 pair of lateral marginal bristles, T4 with 1 pair of marginal lateral and without median marginal bristles. ST5 with deep median V-shaped cleft. Cercus slightly sinuous in lateral view, with pointed obliquely cut apex, dorsal subapical barb and subapical, pointed and latero-dorsal indentation. Cercus with bristles ventrally on proximal half. Cerci with distal third narrower than middle part in posterior view; parallel and with a distinct constriction mid length. Pregonite and postgonite with expanded base, gradually narrowing to apex; unicolorous. Distiphallus with smooth ventroapical margin, conical apex and sinuous dorsal outline. Juxta with microtrichose surface and anterior margin serrated. Vesica symmetrical; distal lobes well developed, sclerotized, broadened in apical half in lateral view, with smooth dorsal and ventral surfaces.

Remarks. Dufek & Mulieri (2017) considered O. berthet a member of the xon group due to the elongate cercus and phallus (Fig. 52), although this is in conflict with the short juxta. The lateral, tooth-like process of the phallic tube is weakly pronounced and similar to that present in O. peruviana, and the sclerotized anterior juxtal margin is similar to that in O. catica, O. fraterna and O. ibera (Dufek & Mulieri 2017). Female unknown. See also remarks under O. ariozanoi sp. n.

Distribution. NEOTROPICAL. Argentina (Chaco).

Biology. The original description mentions the use of Van Someren-Rydon traps baited with rotten squid and that of a hand net for collection of this species (Dufek & Mulieri 2017).

Type material examined. No specimens were examined directly, but photographs of the holotype were provided by courtesy of Dr. Pablo R. Mulieri (MACN).