Apodrosus canalinasus, 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 : 8-10

Apodrosus canalinasus sp. nov.

Figures 10 , 11

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Holotype. Deposited in Poinar amber collection maintained at Oregon State University, Corvallis (Oregon, USA) (accession # 25).

Description. The specimen is complete. Body length (without rostrum), 4.5 mm; rostrum length,

0.8 mm. Body brown-black, with dense appressed light oval scales.

Head not constricted behind eyes; rostrum almost straight, short, 1.0x longer than wide at apex, 1.2x longer than wide in middle, 1.0x longer than wide at base, 0.6x as long as pronotum, densely punctate; rostrum and forehead with longitudinal mid-furrow; epistoma large, naked, and elevated; forehead wide, very weakly impressed, 0.8x as narrow as rostrum base width; eyes large, weakly convex, oval; temples present; geniculate antennae inserted behind middle of rostrum, reaching middle of pronotum; pterygia dorso-lateral; antennomeres almost conical; 1st antennomere (scape) 8.4x longer than wide, reaching posterior margin of eyes; 2nd antennomere 2.6x longer than wide, 1.0x as long and 0.3x as narrow as 1st antennomere; 3rd antennomere 3.3x longer than wide, 0.7x as long as and 0.8x as narrow as 2nd antennomere; 4th antennomere 2.3x longer than wide, 0.9x as long as and 0.9x as narrow as 4th antennomere; 5th antennomere 1.8x longer than wide, 0.9x as long as and 1.1x as wide as 4th antennomere; 6th antennomere 1.6x longer than wide, 0.9x as long as and equal in width to 5th antennomere; 7th antennomere 1.6x longer than wide, 1.1x as long as and 1.1x as wide as 6th antennomere; 8th antennomere 1.3x longer than wide, 0.9x as long as and 1.1x as narrow as 7th antennomere; club compact, 3.4x longer than wide, 0.6x as long as flagellum, with fused articles.

Pronotum 1.1x longer than wide at apex, 0.9x longer than wide in middle and at base; coarsely punctate, weakly flattened, distinctly narrower than elytral base; sides almost straight; scutellum trapezoidal.

Elytra weakly convex, 3.4x as long as pronotum, 2.1x longer than wide at base, 1.7x longer than wide in middle, 2.6x longer than wide at apical fourth; humeri convex; punctate striae distinct; intervals weakly convex, wide, 3.0-5.0x as wide as diameter of points, with rows of curved narrow scales; apical part of elytra not convex laterally.

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

Abdomen weakly flattened, finely punctate; 1st, 2nd and 5th ventrites elongate. 1st ventrite 1.5x as long as metacoxal cavities length; 2nd ventrite 1.2x as long as 1st ventrite; 3rd ventrite 0.2x as long as 2nd ventrite; 4th ventrite equal in length to 3rd ventrite; 5th ventrite 2.0x as long as 4th ventrite.

Procoxae located near middle of prosternum; mesocoxae rounded, narrowly separated; femora thickened, punctate, without teeth; prolegs not increased; profemora 4.0x longer than wide in middle; metafemora 4.7x longer than wide in middle; tibiae almost straight, punctate, with mucro; protibia 6.7x longer than wide in middle; metatibia 5.0x 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: 1st tarsomere 1.6x longer than wide; 2nd tarsomere 0.9x longer than wide, 0.8x as long as and 1.4x as wide as 1st tarsomere; 3rd tarsomere 0.6x longer than wide, 1.2x as long as and 1.7x as wide as 2nd tarsomere; 5th tarsomere 3.0x longer than wide, 1.3x as long as and 0.3x as wide as 3rd tarsomere. Type locality. Amber mine in the northern portion of the Dominican Republic.

Etymology. The species epithet is from the Latin “canalis” = groove and the Latin “nasus” = nose, in reference to the furrow on the rostrum.

Diagnosis. The new species is close Apodrosus viridium Girón and Franz, 2010 from Hispaniola but differs by the tibiae lacking a premucro, the body with light scales, the legs brown-black, and the eyes weakly convex.

Remarks. The semi-enclosed metatibial corbel, the rostrum and forehead with a longitudinal mid-furrow and the large, naked, elevated epistoma indicate that the new species belongs to the genus Apodrosus .

Figures

FIGURE 10. Dorsal view of Apodrosus canalinasus n. sp. in Dominican amber. Scale bar equals 0.8 mm.

FIGURE 11. Lateral view of Apodrosus canalinasus n. sp. in Dominican amber. Scale bar equals 0.8 mm