Coptoborus incomptus, 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 incomptus sp. nov. Figure 8A-C, M

Type material.

Holotype, female, Peru: Madre de Dios Dept., Los Amigos Biological Station, 12°34.9S, 70°6.04W, Smith, Hulcr, 26.iv.-2.v.2008, sample Peru 2, branch (MUSM). Paratypes, female, as holotype except: sample 50a, 9 cm diameter trunk (MUSM); as previous except: CM2, 12.4492°S, 70.2517°W, Smith, Hulcr, 17-18.v.2008, sample Peru 76, 3 cm diameter twig (MSUC, 1; NMNH, 1).

Diagnosis.

1.7-1.9 mm (mean = 1.8 mm; n = 4), 2.83-3.17 × as long as wide. This species is distinguished by the elytral apex attenuate and entire, declivital interstriae 1-3 denticulate, interstriae 2 with many fewer denticles than interstriae 1 or 3, declivital striae weakly impressed, antennal club obliquely truncate, type 2, segment 1 occupying basal 1/2, and posterolateral margin of declivity costate, armed with two large denticles.

Similar species.

C. amplissimus , C. catulus , C. newt , C. scully .

Description

(female). 1.7-1.9 mm (mean = 1.8 mm; n = 4), 2.83-3.17 × as long as wide (holotype 1.7 mm, 2.83 × as long as wide). Body light brown, elytra darker, antennae and legs lighter. Head: epistoma smooth. Frons dull, finely punctate, setose; each puncture bearing a long, erect hair-like seta. Eyes narrowly and deeply emarginate. Submentum narrow, triangular, deeply impressed. Antennal scape short and thick, as long as club. Pedicel shorter than funicle. Club circular, obliquely truncate, type 2; segment 1 corneous, transverse on anterior face, occupying basal ~2/5; segment 2 narrow, transverse, corneous; segments 1 and 2 present on posterior face. Pronotum: 1.1-1.2 × as long as wide. In dorsal view long and rounded frontally, type 7, sides parallel in basal 4/5, rounded anteriorly; anterior margin without serrations. In lateral view elongate, disc longer than anterior slope, type 7, summit prominent, on anterior 2/3. Anterior slope with densely spaced, broad fine asperities, becoming lower and more strongly transverse towards summit. Disc dull with sparse, minute punctures, some longer hair-like setae at margins. Lateral margins obliquely costate. Elytra: 1.8-1.9 × as long as wide, 1.8 × as long as pronotum. Scutellum small. Elytra attenuate, parallel-sided in basal 82-83%, 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 (typically abraded). Declivity steeply rounded, occupying ~1/4 of elytra, smooth, shiny, declivital face weakly convex; striae distinctly impressed, strial punctures larger, deeper than those of disc, glabrous, striae 1 irregular, slightly laterally broadened from base to declivital midpoint and then narrowing towards apex; interstriae flat, interstriae 1 and 3 each with three large denticles, interstriae 2 with two denticles, one at summit and one near apex, those of interstriae 1 and 3 subequal, much larger than those of interstriae 2, interstriae with a sparse row of erect bristle-like setae. Posterolateral margin costate, armed with two large denticles. Legs: protibiae obliquely triangular, broadest at apical 1/3; 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 eight and seven large, socketed denticles, respectively.

Etymology.

L. incomptus = unadorned. In reference to the sparsely granulate declivity. Adjective.

Distribution.

Peru (Madre de Dios).

Biology.

The species has been collected from twigs and a trunk of an unknown tree 3-9 cm diameter.

Figures

Figure 8. Dorsal, lateral, frontal and declivital view of Coptoborus incomptus holotype, 1.7 - 1.9 mm (A-C, M), C. incultus holotype, 2.3 mm (D-F, N), C. inornatus paratype, 1.8 mm (G-I, O), C. janeway holotype, 2.0 mm (J-L, P). All photographs by SMS except G-I, O by T. H. Atkinson, copyright National Museum of Natural History, Smithsonian Institution, Washington, D. C., published by permission.