Coptoborus obtusicornis (Schedl, 1976) Smith & Cognato, 2021

Smith, Sarah M. & Cognato, Anthony I., 2021, A revision of the Neotropical genus Coptoborus Hopkins (Coleoptera, Curculionidae, Scolytinae, Xyleborini), ZooKeys 1044, pp. 609-720 : 609

Coptoborus obtusicornis (Schedl, 1976) comb. nov. Figure 11G-I, O

Sampsonius obtusicornis Schedl, 1976: 78.

Type material.

Holotype (NHMW), examined.

New records.

Ecuador: Fco. Orellana P.N. Yasuní, 00°40'32"S, 76°21'19"W, 250 m, 19 Feb 2005, I. Rodríguez (PUCE, 1).

Diagnosis.

3.0-3.4 mm (mean = 3.22 mm; n = 5), 3.78-4.29 × as long as wide. This species is distinguished by the elytra attenuate, apex emarginate, elytra deeply excavated between interstriae 3, excavated area bearing granules or small denticles and anterior margin of pronotum with a pair of projecting serrations.

Similar species.

C. vespatorius .

Distribution.

Brazil ( Maranhão, Mato Grosso, Paraná, São Paulo), Costa Rica (Heredia), Ecuador* (Orellana), Peru ( Huánuco, Junín, Loreto, Madre de Dios).

Biology.

This species has only been collected from Cecropia ( Urticaceae ) ( Smith et al. 2017).

Remarks.

This species shares remarkable morphological convergence with Sampsonius Eggers, 1935, especially with regard to the prontotum shape in dorsal view, (type b) conspicuously long and acuminate frontally. This pronotal shape has been assumed to be diagnositic for Sampsonius but with the exception of the pronotal form, S. obtusicornis and Sampsonius are quite different and this shape is due to convergence. We transfer this species to Coptoborus due to the following combination of characters ( Sampsonius characters given first): protibia slender with greatly enlarged and prominent apical mucro, and outer margin and posterior face granulate vs. protibia distinctly triangular, apical mucro small, and posterior face unarmed; strongly concave lateral edge of pronotum vs. convex lateral margin; antennal club type 4 with sutures 1 and 2 strongly procurved vs. antennal club type 3 with sutures 1 and 2 transverse ( Bright 1991; Petrov and Mandelshtam 2009; Smith 2017).

Figures

Figure 11. Dorsal, lateral, frontal and declivital view of Coptoborus newt holotype, 1.7 mm (A-C, M), C. nudulus, 2.3 - 2.4 mm (D-F, N), C. obtusicornis, 3.0 - 3.4 mm (G-I, O), C. ochromactonus, paratype, 2.5 - 2.6 mm (J-L, P). All photographs by SMS.