Coptoborus amplissimus, 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 amplissimus sp. nov. Figure 1D-F, N

Type material.

Holotype, female, Peru: Madre de Dios, Los Amigos Biological Station, CM2, 12°44.92'S, 70°25.17'W, 17-18.v.2008, Smith, Hulcr, sample Peru 103a, 8 cm diameter branch (MUSM).

Diagnosis.

2.8 mm (n = 1), 2.8 × as long as wide. This species is distinguished by the elytral apex attenuate and entire, declivital interstriae 1-3 denticulate, interstriae 2 with much fewer denticles than interstriae 1 or 3, antennal club flat, type 3, segment 1 occupying basal 1/4, and posterolateral margin of declivity costate, armed with two denticles.

Similar species.

C. catulus , C. incomptus , C. newt , C. scully .

Description

(female). Holotype 2.8 mm, 2.8 × as long as wide. Body light brown, elytral declivity darker, antennae and legs lighter. Head: epistoma smooth. Frons dull, finely punctate, glabrous. Eyes broadly and moderately emarginate. Submentum narrow, triangular, deeply impressed. Antennal scape short and thick, as long as club. Pedicel shorter than funicle. Club circular, flat, type 3; segment 1 corneous, subconvex on anterior face, occupying basal ~1/4; segment 2 narrow, subconvex, corneous; segments 1 and 2 present on posterior face. Pronotum: 1.2 × as long as wide. In dorsal view long and rounded frontally, type 7, sides parallel in basal 3/4, rounded anteriorly; anterior margin without serrations. In lateral view elongate, disc as long as anterior slope, type 7, summit prominent, at midpoint. Anterior slope with densely spaced, broad fine asperities, becoming lower and more strongly transverse towards summit. Disc strongly shiny with sparse, minute punctures, some longer hair-like setae at margins. Lateral margins obliquely costate. Elytra: 1.6 × as long as wide, 1.3 × as long as pronotum. Scutellum minute. Elytra attenuate, parallel-sided in basal 63%, then acutely tapered to apex, apex entire. Disc smooth, shiny; striae minutely punctate, glabrous; interstriae flat, sparsely, minutely punctate, unarmed, each puncture bearing a long, erect seta. Declivity gradually rounded, occupying ~1/3 of elytra, smooth, shiny, declivital face weakly flattened; striae not impressed, strial punctures larger, deeper than those of disc, each puncture bearing a recumbent seta as long as one punctures, striae 1 slightly laterally broadened from base to declivital midpoint and then narrowing towards apex; interstriae flat, interstriae 1 and 3 with four or five and four, respectively, subequal, uniformly spaced small denticles, interstriae 2 with a row of minute denticles, interstriae 2 with five or six minute denticles, much smaller than those of interstriae 1 or 3, interstrial setae sparse erect bristle-like, interstriae 1 with an additional sparse row of slightly shorter semi-recumbent setae. Posterolateral margin costate, armed with two denticles. Legs: protibiae distinctly triangular, broadest at apical 1/5; apical 1/2 of outer margin with six large, socketed denticles, their length longer than basal width. Meso- and metatibiae flattened; outer margin evenly rounded with seven and eight moderately sized socketed denticles, respectively, their lengths equal to basal width.

Etymology.

L. amplissimus = largest. In reference to the species size relative to other similar species. Adjective.

Distribution.

Peru (Madre de Dios).

Biology.

This species was collected from an unidentified branch 8 cm in diameter.

Figures

Figure 1. Dorsal, lateral, frontal and declivital view of Coptoborus amazonicus holotype, 2.8 mm (A-C, M), C. amplissimus holotype, 2.8 mm (D-F, N), C. asperatus holotype, 2.0 mm (G-I, O), C. attenuatus holotype, 2.0 mm (J-L, P). All photographs by SMS except (A-C, M) by A. V. Petrov and (J-L, P) by R. K. Osborn.