Piesocorynus hamus, Poinar & Legalov, 2016

Poinar, George & Legalov, Andrei A., 2016, New Anthribidae (Coleoptera: Curculionoidea) in Dominican and Mexican ambers, Palaeontologia Electronica 148 (1), pp. 1-38 : 14-17

Piesocorynus hamus sp. nov.

Figure 9

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Holotype. Probably female. Deposited in the PACO (accession # C-86).

Description. Length body, 4.3 mm; length rostrum, 0.4 mm. Body brown with covering of distinct, dense, pale, appressed setae. Rostrum wide, 0.5 times as long as pronotum, flattened, without dorsal median carina, punctate; antennal scrobes foveiform, lateral; forehead wide, punctate; eyes coarsely faceted, fewer than 26 rows of ommatidia perpendicular to long axis, not emarginate, convex; temples short; antennae inserted in first third of rostrum, elongate, extending beyond humeri and reaching first third of elytra; funicle with second to eighth antennomeres elongate-conical; third antennomere 2.3 times longer than wide; fourth antennomere 1.8 times longer than wide, equal in length and 1.3 times as wide as third antennomere; fifth antennomere equal in length and width, 0.6 times as long as and 1.1 times as wide as fourth antennomere; sixth antennomere 0.9 times longer than wide, equal in length and 1.1 times as wide as fifth antennomere; seventh antennomere subequal to sixth antennomere; eighth antennomere 0.7 times longer than wide, 1.1 times as long as and 1.4 times as wide as seventh antennomere; club not compact, wide; first antennomere of club 0.8 times longer than wide, 2.2 times as long as and 1.9 times as wide as eighth antennomere; second antennomere of club 0.8 times longer than wide, 0.9 times as long as and equal in width to first antennomere of club; third antennomere of club 1.4 times longer than wide, 1.5 times as long as and 0.8 times as narrow as second antennomere of club. Pronotum bell-shaped; 2.3 times longer than wide at apex, 1.1 times longer than wide in middle and 1.2 times longer than wide at base, with quite long lateral carinae; disk flattened, densely punctate, transverse dorsal pronotal carina antebasal; distance between transverse carina and base of pronotum 0.17 times as long as pronotum; its sides angular in middle; scutellum trapezoidal. Elytra flattened, 1.4 times longer than wide at base, 1.7 times longer than wide in middle, 1.8 times longer than wide at apical fourth, 2.1 times as long as pronotum; greatest width in humeri and behind middle; elytron without tubercles; humeri convex; striae regular and thin; strial punctures rounded, dense; elytral intervals weakly convex; apices of elytra not rounded; pygidium not concealed. Thorax punctate; precoxal portion of prosternum elongate, 2.5 times as long as procoxal cavities length, 3.1 times as long as postcoxal portion, postcoxal portion quite short, 0.8 times as long as length of procoxal cavity; procoxal cavities narrowly separated; mesocoxal cavities widely separated, metanepisternum narrow, 5.5 times longer than wide in middle. Abdomen weakly convex; first ventrite 1.2 times as long as length of metacoxal cavity; second and third ventrites subequal in length to first ventrite; fourth ventrite 0.9 times as long as length of third ventrite; fifth ventrite 1.1 times as long as length of fourth ventrite. Legs long; pro- and mesocoxae round; metacoxae transverse; femora clavate, without teeth; trochanters obconical; metafemora 2.7 times longer than wide; tibiae almost straight; metatibiae 4.4 times longer than wide in middle; tarsi long; first to third tarsomeres conical; second tarsomere embracing third tarsomere laterally; fifth elongate; tarsomeres with pulvilli on underside; tarsal claws free, large, diverging, with basal teeth.

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

Etymology. The specific epithet is taken from the Latin “hamus ” equals angle, in reference to the sharp angle on the lateral margins of the pronotum.

Figures

FIGURE 9. Holotype of Piesocorynus hamus sp. nov. PACO no. C-86 in Dominican amber. 1, dorsal view, scale bar equals 1.1 mm; 2, ventral view, scale bar equals 1.0 mm; and 3, lateral view, scale bar equals 1.1 mm.