Coptoborus busoror, 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 busoror sp. nov. Figure 3D-F, N

Type material.

Holotype, female, Ecuador: Napo [= Orellana], Via Kerrmegee, Sta. Rosa, 1°5'77"S, 17[sic, possibly 77]°34'14"W, 377 m, 21 Sep 2000, M. Vallejo R., ex. Astrocaryum urostachys (PUCE).

Diagnosis.

2.7 mm (n = 1), 2.7 × as long as wide. This species is distinguished by the elytral apex attenuate and weakly emarginate, declivity distinctly sulcate along interstriae 2, declivital interstriae 2 unarmed, interstriae 1 and 3 armed, declivital striae 1 and 2 parallel on declivital face and widely spaced, and declivital striae 2 punctate. It is most similar to C. ochromactonus and can be further distinguished by the larger size 2.7 mm vs. 2.5-2.6 mm, and more elongate body 2.7 × as long as wide vs. 2.5-2.6 × as long as wide, more elongate pronotum 1.2 × as long as wide vs. 1.05-1.1 × as long as wide, and distribution east of the Andes vs. west of the Andes.

Similar species.

C. leeloo , C. nudulus , C. ochromactonus , C. pilisoror , C. ripley , C. sororcula , C. spicatus .

Description

(female). Holotype 2.7 mm, 2.7 × as long as wide. Body brown, antennae and legs lighter. Head: epistoma smooth. Frons strongly shiny, finely punctate, setose; each puncture bearing a long, erect hair-like seta. Eyes broadly and moderately emarginate. Submentum narrow, triangular, deeply impressed. Antennal scape regularly thick, shorter than 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 with two projecting serrations. In lateral view elongate, disc longer than anterior slope, type 7, summit prominent, on anterior 3/4. Anterior slope with densely spaced, broad coarse asperities, becoming lower and more strongly transverse towards summit. Disc reticulate, subshiny with moderately dense, minute punctures, some longer hair-like setae at margins. Lateral margins carinate on basal third. Elytra: 1.5 × as long as wide, 1.25 × as long as pronotum. Scutellum minute. Elytra attenuate, parallel-sided in basal 2/3, then acutely rounded to apex, apex weakly emarginate. Disc smooth, dull; strial punctures moderate, shallow, glabrous; interstriae flat, sparsely, minutely punctate, unarmed, each puncture bearing a long semi-erect hair-like seta. Declivity gradual, smooth, shiny, appearing bisulcate, occupying apical 2/5 of elytra; striae not impressed, striae 1 and 2 parallel, strial punctures much larger and shallower than those of disc; interstriae 2 weakly sulcate, unarmed, punctate; interstriae 1 and 3 weakly costate with six and five minute granules, each granule bearing a long semi-erect hair-like seta. Posterolateral margin with interstriae 3 and 9 joining, forming a weakly serrate acute carina and continuing submarginally to apex. Legs: protibiae obliquely triangular, broadest at apical 1/4; apical 1/2 of outer margin with seven large, socketed denticles, their length longer than basal width. Meso- and metatibiae flattened; outer margin evenly rounded with seven large, socketed denticles.

Etymology.

L. bu = big, soror = sister. Noun in apposition.

Distribution.

Ecuador (Orellana).

Biology.

This species has been recorded from Astrocaryum urostachys ( Arecaceae ).

Figures

Figure 3. Dorsal, lateral, frontal and declivital view of Coptoborus brigman holotype, 1.8 mm (A-C, M), C. busoror holotype, 2.7 mm (D-F, N), C. capillisoror holotype, 2.3 mm (G-I, O), C. carumbensis holotype, 2.2 mm (J-L, P). All photographs by SMS, J-L, P copyright National Museum of Natural History, Smithsonian Institution, Washington, D. C., published by permission.