Piesocorynus tribullus, 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 : 12-14

Piesocorynus tribullus sp. nov.

Figure 7

zoobank.org/ 2FF19DAA-D926-4427-B65F-CDA51CB48A8D

Holotype. Probably female. Deposited in the PACO (accession # C-85).

Description. Length body, 5.9 mm; length rostrum, 1.2 mm. Body brownish-black with a covering of distinct, dense, pale, appressed setae. Rostrum wide and short, almost equal in length and width, 0.5 times as long as pronotum, flattened, without dorsal median carina; antennal scrobes foveiform, lateral; forehead wide, weakly convex, punctate; eyes coarsely faceted, fewer than 26 rows of ommatidia perpendicular to long axis, not emarginate, large, weakly convex, 1.3 times longer than wide; vertex weakly convex, densely punctate; temples short, 0.5 times as long as length of eye; antennae inserted in first third of rostrum, elongate, reaching pronotal transverse carina; funicle with second to eighth antennomeres elongate-conical; second antennomere 2.3 times longer than wide; third antennomere 4.5 times longer than wide, 1.4 times as long as and 0.7 times as narrow as second antennomere; fourth and fifth antennomeres subequal in width; fourth antennomere 3.0 times longer than wide, 0.6 times as long as and 0.9 times as narrow as third antennomere; fifth antennomere 4.0 times longer than wide, 1.3 times as long as fourth antennomere; sixth antennomere 3.9 times longer than wide, 0.9 times as long as and 0.9 times as wide as fifth antennomere; seventh antennomere 1.2 times longer than wide, 0.4 times as long as and 1.4 times as wide as sixth antennomere; eighth antennomere equal in length and width, subequal in length and 1.2 as wide as seventh antennomere; club not compact. Pronotum bell-shaped; 1.1 times longer than wide at apex, 0.8 times longer than wide in middle and 0.9 times longer than wide at base, with short lateral carinae; disk weakly flattened, densely and rugosely punctate; transverse dorsal pronotal carina antebasal; distance between transverse carina and base of pronotum 0.14 times as long as pronotum; scutellum trapezoidal. Elytra distinctly convex, 1.4 times longer than wide at base and in middle, 1.8 times longer than wide at apical fourth, 2.2 times as long as pronotum; greatest width behind middle; elytron with three tubercles: one tubercle on base of second and third intervals, one tubercle in middle and one tubercle before apex of third intervals; humeri convex; striae regular and thin; strial punctures small, rounded, dense; elytral intervals flattened, wide, 1.5–5.0 times as wide as striae, sparsely and faintly punctate; apices of elytra not rounded; pygidium not concealed. Thorax coarsely punctate; precoxal portion of prosternum elongate; postcoxal portion short; procoxal cavities narrowly separated; mesocoxal cavities widely separated, metanepisternum narrow, 7.4 times longer than wide in middle. Abdomen convex; second ventrite 0.9 times as long as length of first ventrite; third ventrite 0.8 times as long as length of second ventrite; fourth ventrite 0.8 times as long as length of third ventrite; fifth ventrite 1.4 times as long as length of fourth ventrite. Legs long; pro- and mesocoxae round; metacoxae transverse; femora clavate, without teeth; trochanters obconical; profemora 3.7 times longer than wide; mesofemora 4.1 times longer than wide; metafemora 3.5 times longer than wide; tibiae almost straight; mesotibiae 11.8 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; mesotarsi: first tarsomere 3.0 times longer than wide at base; second tarsomere 1.3 longer than wide at base, 0.5 times as long as and 1.2 times as wide as first tarsomere; metatarsi: second tarsomere 0.7 times as long as first tarsomere; third tarsomere 0.4 times as long as second tarsomere; fifth tarsomere 3.0 times as long 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 “tri” equals three and the Latin “bullus” equals knob, in reference to the three tubercles on each elytron.

Figures

FIGURE 7. Holotype of Piesocorynus tribullus sp. nov. PACO no. C-85 in Dominican amber. 1, dorsal view, scale bar equals 1.1 mm; 2, ventral view, scale bar equals 1.2 mm; and 3, lateral view, scale bar equals 1.3 mm.