Apodrosus tinctocorpus, Poinar & Legalov, 2017

Poinar, GO & Legalov, AA, 2017, Five new species from the subfamily Entiminae (Coleoptera: Curculionidae) in Dominican amber, Palaeontologia Electronica 20 (2), pp. 1-13 : 6-8

Apodrosus tinctocorpus sp. nov.

Figures 7-9

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Holotype. Deposited in Poinar amber collection maintained at Oregon State University, Corvallis (Oregon, USA) (accession # 162).

Description. The specimen is complete. Body length, 5.0 mm; rostrum length, 0.8 mm. Body brown-black, with appressed light oval scales.

Head 0.8x as long as rostrum, not constricted behind eyes; rostrum weakly curved, short, 1.2x longer than wide at apex, 1.8x longer than wide in middle, 1.6x longer than wide at base, 0.6x as long as pronotum, finely punctate; epistoma large, glabrous, elevated; forehead wide, flattened, 0.8x as narrow as rostraum base width; eyes large, convex, oval; temples quite long, 0.8x as long as eye; geniculate antennae inserted in middle of rostrum, reaching base of pronotum; pterygia dorso-lateral; antennomeres almost conical; 1st antennomere (scape) 6.7x longer than wide; 2nd antennomere 2.5x longer than wide, 0.2x as long as and 0.7x as narrow as 1st antennomere; 3rd antennomere 3.3x longer than wide, 0.9x as long as and 0.7x as narrow as 2nd antennomere; 4th antennomere 1.8x longer than wide, 0.5x as long as and equal in width to 4th antennomere; 5th antennomere 1.3x longer than wide, 0.9x as long as and 1.1x as wide as 4th antennomere; 6th antennomere 1.1x longer than wide, 0.8x as long as and equal in width to 5th antennomere; 6th–7th antennomeres subequal in length; 7th antennomere equal to 8th antennomere; 8th antennomere equal in length and width, 0.8x as long as and 0.9x as narrow as 7th antennomere; club compact, 2.1x longer than wide, 0.1x as long as flagellum, with fused articles.

Pronotum quite long, 2.1x longer than wide at apex, 1.4x longer than wide in middle, 1.6x longer than wide at base; densely punctate, weakly flattened, distinctly narrower than elytral base; sides almost straight; scutellum trapezoidal.

Elytra convex, 2.7x as long as pronotum, 2.6x longer than wide at base, 2.1x longer than wide in middle, 3.6x longer than wide at apical fourth; humeri convex; punctate striae distinct, with quite large points; intervals weakly convex, quite wide, 2.0–3.3x as wide as diameter of points; apical part of elytra convex laterally.

Prosternum weakly convex, densely punctate, without postorbital lobe, and vibrissae; pre- and postcoxal portions of prosternum long; procoxal cavities connect; metasternum weakly convex, punctate; metepisternum quite narrow.

Abdomen flattened, finely punctate; 1st, 2 nd, and 5th ventrites elongate; 3rd and 4th ventrites short.

Procoxae located near middle of prosternum; mesocoxae rounded, narrowly separated; prolegs not increased in size; femora thickened, punctate, without teeth; profemora 5.2x longer than wide in middle; metafemora 5.1x longer than wide in middle; tibiae almost straight, punctate, with mucro and premucro; protibia 6.7x longer than wide in middle; metatibia 7.6x longer than wide in middle; metatibial corbel semi-enclosed; tarsi elongate; 1st tarsomere elongate; 2nd tarsomere conical; 3rd tarsomere bilobed; 5th tarsomere elongate; claws connate; protarsi: 2nd tarsomere 0.7x as long as 1st tarsomere; 3rd tarsomere equal in length to 2nd tarsomere; 5th tarsomere 2.5x as long as 3rd tarsomere; metatarsi: 3rd tarsomere subequal in length to 2nd tarsomere; 5th tarsomere 1.5x as long as 3rd tarsomere.

Type locality. Amber mine in the northern portion of the Dominican Republic.

Etymology. The species epithet is taken from the Latin “tinctus” = dyed and the Latin “corpus” = body, in reference to the unicolored body.

Diagnosis. The new species is close to Apodrosus andersoni Girón and Franz, 2010 from Hispaniola but differs by the shorter scape, narrower pronotum, elytral intervals without erect setae, apical part of elytra convex laterally, and larger body sizes. From A. quisqueyanus Girón and Franz, 2010 from Hispaniola, it differs by the unicolored body, longer rostrum, narrower pronotum, and wider eye.

Remarks. This and the following new species belong to the tribe Polydrusini because the pterygia are dorso-lateral, the claws are connate, the head is not constricted behind the eyes, and the prolegs are not widened ( van Emden, 1944). The tibiae with a promucro and mucro, the semi-enclosed metatibial corbel and the large, elevated epistoma of these species are characters of the genus Apodrosus .

Figures

FIGURE 7. Dorsal view of Apodrosus tinctocorpus n. sp. in Dominican amber. Scale bar equals 0.9 mm.

FIGURE 8. Lateral view of Apodrosus tinctocorpus n. sp. in Dominican amber. Scale bar equals 1.2 mm.

FIGURE 9. Lateral view of apex of metatibia of Apodrosus tinctocorpus n. sp. in Dominican amber. Scale bar equals 0.2 mm.