Tribonium neospectrum Lopes 1978

Tribonium neospectrum Lopes, 1978

(Figs. 21–29, 30, 36)

Examined material. Argentina: Misiones Province, 1♂, Oberá, (-27,484.697; -55,123.311) 01/IX/1987 (Col. Fundación Félix Azara).

Measurements (mm). Male. TL: 19.4. BL: 17.4. BW: 8.9. PL: 3.6. PW: 6.7. TeL: 16.1. TeW: 5.6. IO: 1.4. IA: 1.7. IOc: 1.3.

Redescription. Size small for the genus, even smaller than the holotype but with similar characteristics.

Thorax. Prothoracic femora D0 type, with ventral posterior margins unarmed and genicular spine absent. The same spine distribution observed in the prothoracic femora is also observed in meso- and metathoracic legs. Tibial formula: Males [5*2*2–1] [9*3*5–4] [14–12*3–2*7–6]. Tarsi with large arolia.

Male genitalia. L2’with an elongated and remarkably curved apophysis (Figs. 27–28, 30); cranial margin of via completely arched, its dorsal process almost straight and the other side with the blunt cranial projection only. The acute, caudal projection only slightly discernible (Fig. 30 d). L3’ subconical base gently narrowing until turning into a well-defined neck. Internal margin of the apical hook almost straight (Figs. 26, 36). The subapical incision is broad compared with those of T. rothi and T. conspersum. Latero-cranial apex of R3’wide and truncated (Fig. 29 b). R2’ less curved (Fig. 29 a) compared with T. conspersum. The tooth of cpR1T’ is scarcely insinuated.