Stenotrupis breviscapus, Davis & Engel, 2007

Davis, S. R. & Engel, M. S., 2007, Cossonine weevils in Dominican amber (Coleoptera: Curculionidae), Linzer biologische Beiträge 39 (2), pp. 803-820 : 803-820

Stenotrupis breviscapus nov.sp. ( Figs 26 , 39-43 )

H o l o t y p e: USNM 505344 (= Woodruff #9793), amber, Dominican Republic, Early Miocene (Burdigalian). P a r a t y p e s: USNM 504857 (= Woodruff #9304) and USNM 505354 (= Woodruff #9803), amber, Dominican Republic, Early Miocene (Burdigalian).

D i a g n o s i s Body distinctly dorso-ventrally compressed, less than 2.0 mm, with sparse setae scattered throughout. Compound eyes circular. Scape extending back only to near anterior margin of compound eye ( Fig. 39 ). Rostrum nearly straight, slightly longer than length of pronotum. Width of metepisternum less than width of antennal club, with one longitudinal row of minute punctures.

D e s c r i p t i o n: Total body length (including rostrum) ca. 2.13 mm; maximal width ca. 0.29 mm; elytral length ca. 1.23 mm. Integument light brown to brown (as preserved) ( Fig. 26 ). Body markedly dorso-ventrally compressed ( Fig. 26 ). Compound eyes circular, length approximately equal to width; interocular distance approximately equal to width of rostrum at mid-length in dorsal view. Rostrum with dense covering of short, fine setae, puncticulate, punctures minute; rostrum slightly longer than length of pronotum; ventral margin nearly straight in profile, only very broadly and uniformly curved along entire length ( Fig. 39 ); rostrum gradually expanded slightly apically in dorsal view ( Fig. 40 ). Antenna inserted immediately before mid-length of rostrum; scrobe short and shallow; scape extending near to posterior margin of compound eye; scape moderately long (albeit still short by comparison to modern species), slightly more than one-third length of rostrum; funicle 5-segmented ( Fig. 41 ), gradually enlarging to distinct, setose club. Vertex mostly glabrous and punticulate. Head slightly constricted behind compound eyes, with distinct, transverse region of glabrous integument beyond constriction and near posterior margin of head. Pronotum with dense covering of short, fine setae, length approximately 1.2✕ width; anterior portion narrower than posterior portion; small, shallow punctures present, punctures separated by distance 0.5-1✕ puncture diameter; two longitudinal rows, each of four larger punctures separated by distance much less than 0.5✕ puncture diameter, along middle of pronotum; lateral margins broadly rounded. Prosternum without shallow depression between procoxae, puncticulate, and with dense covering of short, fine setae; coxal positions depicted in figure 43. Scutellum ovoid, convex. Elytra with dense covering of short, fine setae, each with approximately 7-8 striae; punctures of elytral striae small and shallow, separated by distance approximately 1✕ puncture diameter; elytra approximately four times length of pronotum; humeri subquadrate. Metepisternum narrower than width of antennal club, with a single, distinct, longitudinal row of minute punctures. Metasternum and abdominal ventrites puncticulate, with somewhat dense covering of short, fine setae. Femora generally broad ( Fig. 42 ), widest at mid-length and puncticulate; tibiae slightly laterally expanded apically; apical tibial unci at outer angle small, partially obscured by amber piece; denticle on opposite side of uncus on inner angle obscured, it is unclear as to its presence.

E t y m o l o g y: The specific epithet is a combination of the Latin words brevis (meaning "short") and scapus (meaning "stem") and is a reference to the relatively short scape by comparison to modern species of the genus.

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C o m m e n t s: This species is very similar to its modern congeners except in the reduced length of the scape.

Figures

Figs 23-28: Photomicrographs of Dominican amber cossonine weevils. (23) holotype of Caulophilus swensoni nov.sp. (USNM 502877); (24) paratype of C. swensoni (USNM 502666); (25) holotype of Proeces longirostrum nov.sp. (USNM 502728); (26) holotype of Stenotrupis breviscapus nov.sp. (USNM 505344); (27) holotype of Cossonus hinojosai nov.sp. (USNM 505580), dorsal aspect; (28) holotype of C. hinojosai, lateral aspect.

Figs 39-48: Two species of Cossonini, Stenotrupis breviscapus nov.sp. (holotype and paratype) and Cossonus hinojosai nov.sp. (holotype). (39) lateral aspect of head and anterior pronotum of S. breviscapus (USNM 504857); (40) dorsal, oblique aspect of head of S. breviscapus (USNM 504857); (41) antenna of S. breviscapus (USNM 504857); (42) protibia, profemur, protarsus, and pro-pretarsus of S. breviscapus (USNM 505344); (43) ventral aspect of prothorax showing position of procoxae of S. breviscapus (USNM 504857); (44) lateral aspect of head and pronotum of C. hinojosai (USNM 505580); (45) dorsal, slightly oblique aspect of head and pronotum of C. hinojosai; (46) antenna of C. hinojosai; (47) protibia, profemur, protarsus, and pro-pretarsus of C. hinojosai; (48) ventro-lateral oblique aspect of prosternum showing position of procoxae of C. hinojosai. All drawn as preserved.