Piesocorynus bibullus, 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 : 10-12

Piesocorynus bibullus sp. nov.

Figure 6

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Holotype. Probably female. Deposited in the ISEA DA no. 2015/1.

Description. Length body, 3.4 mm; length rostrum, 0.5 mm. Body black with covering of dark, dense, appressed setae. Rostrum quite wide, 0.5 times as long as pronotum, flattened, without dorsal median carina; antennal scrobes foveiform, lateral; forehead quite wide, flat, punctate; eyes oval, 1.5 times longer than wide, not emarginate, convex, coarsely faceted, fewer than 26 rows of ommatidia perpendicular to long axis; vertex weakly convex, punctate; temples 0.6 times as long as length of eye; antennae inserted in first third of rostrum, elongate, reaching humeri; first antennomere (scape) 1.8 times longer than wide; funicle with second to eighth antennomeres conical; second antennomere 1.5 times longer than wide, 0.9 times as long as and equal in width to first antennomere; third antennomere 2.7 times longer than wide, 1.3 times as long as and 0.8 times as narrow as second antennomere; fourth to sixth antennomeres subequal in width; fourth antennomere 2.8 times longer than wide, 0.9 times as long as and 0.8 times as narrow as third antennomere; fifth antennomere 2.4 times as wide as width as fourth antennomere; sixth antennomere equal to fifth antennomere; sev-

PALAEO- ELECTRONICA.ORG enth antennomere 1.7 times longer than wide, 0.8 times as long as and 1.2 times as wide as sixth antennomere; eighth antennomere 2.0 times longer than wide, 1.2 times as long as and equal in width to seventh antennomere; club not compact, 0.5 times as long as funicle; first antennomere of club 1.3 times longer than wide, 1.3 times as long as and 2.0 times as wide as eighth antennomere; second antennomere of club 1.1 times longer than wide, 0.9 times as long as and 1.1 times as wide as first antennomere of club; third antennomere of club 1.7 times longer than wide, 1.4 times as long as and 0.9 times as narrow as second antennomere of club. Pronotum bell-shaped; with lateral carinae; disk weakly flattened, densely punctate, transverse dorsal pronotal carina antebasal; distance between transverse carina and base of pronotum 0.2 times as long as pronotum; scutellum trapezoidal. Elytra convex, 2.1 times as long as pronotum; greatest width behind middle; elytron with two tubercles on third interval: one at base and one in middle; humeri weakly convex; striae regular and narrow; strial punctures small, rounded, dense; elytral intervals weakly convex, quite wide, 1.5–2.7 times as wide as striae, sparsely and gentle punctate; apices of elytra not rounded; pygidium not concealed. Thorax punctate; precoxal portion of prosternum elongate, 1.1 times as long as procoxal cavities, 3.2 times as long as postcoxal portion; postcoxal portion 0.3 times as long as procoxal cavities; procoxal cavities narrowly separated; mesocoxal cavities widely separated, metanepisternum narrow, 6.7 times longer than wide in middle. Abdomen convex; first ventrite 0.4 times as long as length of metacoxal cavity; second ventrite 2.0 times as long as length of first ventrite; third ventrite subequal in length to second ventrite; fourth ventrite 0.5 times as long as length of third ventrite; fifth ventrite 1.2 times as long as length of fourth ventrite. Legs long; pro- and mesocoxae round; metacoxae transverse; femora clavate, without teeth; trochanters obconical; profemora 3.3 times longer than wide; mesofemora 2.8 times longer than wide; metafemora 2.9 times longer than wide; tibiae almost straight; mesotibiae 6.7 times longer than wide in middle; metatibiae 7.8 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; protarsi: first tarsomere 2.8 times longer than wide at base; second tarsomere 1.4 longer than wide at base, 0.6 times as long as and 1.2 times as wide as first tarsomere; third tarsomere 0.8 times longer than wide, 0.6 times as long as and 0.9 times as wide as second tarsomere; fifth tarsomere 2.8 times longer than wide at base, 0.5 times as long as and 0.6 times as wide as second tarsomere; mesotarsi: first tarsomere 2.8 times longer than wide at base; second tarsomere 1.7 longer than wide at base, 0.7 times as long as and 1.2 times as wide as first tarsomere; third tarsomere 1.2 times longer than wide, 0.6 times as long as and 0.8 times as wide as second tarsomere; fifth tarsomere 3.0 times longer than wide at base, 1.2 times as long as and 0.7 times as wide as second tarsomere; metatarsi: first tarsomere 3.4 times longer than wide at base; second tarsomere equal in length and width, 0.4 times as long as and 1.4 times as wide as first tarsomere; third tarsomere equal in length and width, 0.7 times as long as and 0.7 times as wide as second tarsomere; fifth tarsomere 4.3 times longer than wide at base, 2.4 times as long as and 0.6 times as wide as second tarsomere.

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 “bi” equals two and the Latin “bullus” equals knob, in reference to the two tubercles on each elytron.

Figures

FIGURE 6. Holotype of Piesocorynus bibullus sp. nov. ISEA DA no. 2015/1 in Dominican amber. 1, dorsal-lateral view, scale bar equals 1.0 mm; and 2, lateral view, scale bar equals 0.8 mm.