Piesocorynus parategus, 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 : 19-21

Piesocorynus parategus sp. nov.

Figure 11

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Holotype. Probably female. Deposited in the PACO (accession # C-103).

Description. Length body, 3.9 mm; length rostrum, 0.9 mm. Body brown with covering of distinct, dense, pale, appressed setae. Rostrum wide and short, equal in length and width, 0.4 times as long as pronotum, flattened, without dorsal median carina; antennal scrobes foveiform, lateral; forehead wide, flattened, punctate; eyes coarsely faceted, fewer than 26 rows perpendicular to long axis, not emarginate, large, convex, round, vertex weakly convex, densely and finely punctate; temples quite short, 0.4 times as long as length of eye; antennae inserted in first third of rostrum, elongate, not reaching humeri; first antennomere (scape) 2.0 times longer than wide; funicle with second to eighth antennomeres elongate-conical; second antennomere 3.5 times longer than wide, 1.4 times as long as and 0.8 times as narrow as first antennomere; second and third antennomeres subequal in width; third antennomere 4.0 times longer than wide, 1.1 times as long as second antennomere; third and fourth antennomeres equal in length; fourth antennomere 5.3 times longer than wide, 0.8 times as long as third antennomere; fifth antennomere 4.7 times longer than wide, 0.9 times as long as fourth antennomere; sixth antennomere 3.0 times longer than wide, 0.9 times as long as and 1.3 times as wide as fifth antennomere; seventh antennomere 1.8 times longer than wide, 0.9 times as long as and 1.5 times as wide as sixth antennomere; eighth antennomere 1.3 times longer than wide, 0.9 times as long as and 1.3 times as wide as seventh antennomere; club not compact, 0.9 times as long as funicle; first antennomere of club equal in length and width, 2.8 times as long as and 3.5 times as wide as eighth antennomere; second antennomere of club 0.8 times longer than wide, 1.3 times as long as and 0.9 times as narrow as first antennomere of club; third antennomere of club 1.5 times longer than wide, 1.5 times as long as and 0.8 times as narrow as second antennomere of club. Pronotum wide-bell-shaped; 0.9 times longer than wide at apex, 0.7 times longer than wide in middle and 0.8 times longer than wide at base, with long lateral carinae; disk weakly flattened, densely punctate, transverse dorsal pronotal carina antebasal; distance between transverse carina and base of pronotum 0.16 times as long as pronotum; scutellum trapezoidal. Elytra distinctly convex, 1.1 times longer than wide at base, 1.0 times longer than wide in middle, 1.3 times longer than wide at apical fourth, 2.1 times as long as pronotum; greatest width behind middle; elytron without tubercles; humeri weakly convex; striae regular and thin; strial punctures rounded and dense; elytral intervals flattened, narrow, 0.9–1.1 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, 1.3 times as long as procoxal cavities, 1.6 times as long as postcoxal portion; postcoxal portion 0.8 times as long as procoxal cavities; procoxal cavities narrowly separated; mesocoxal cavities widely separated, metanepisternum wide, 3.0 times longer than wide in middle. Abdomen convex; first ventrite 1.2 times as long as length of metacoxal cavity; second ventrite 0.9 times as long as length of first ventrite; third ventrite equal in length to length of second ventrite; fourth ventrite 0.9 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; metafemora 2.2 times longer than wide; tibiae almost straight; metatibiae 5.1 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 3.3 times longer than wide at base; second tarsomere 1.2 longer than wide at base, 0.9 times as long as and 2.4 times as wide as first tarsomere; third tarsomere equal in length and width, 0.4 times as long as and 0.5 times as wide as second tarsomere; fifth tarsomere 3.8 times longer than wide at base, 1.1 times as long as and 0.8 times as wide as second tarsomere; metatarsi: first tarsomere 4.6 times longer than wide at base; second tarsomere 1.6 times longer than wide at base, 1.1 times as long as and 3.1 times as wide as first tarsomere; third tarsomere equal in length and width, 0.4 times as long as and 0.7 times as wide as second tarsomere; fifth tarsomere 5.3 times longer than wide at base, 0.9 times as long as and 0.3 times as wide as second tarsomere.

Type locality. Amber mine in Chiapas Highlands of the Simojovel area in Chiapas, Mexico .

Etymology. The specific epithet is taken from the Latin “parus” equals equal, and the Latin “tego” equals cover, indicating that the length and width of the elytra are approximately of equal values.

Figures

FIGURE 11. Holotype of Piesocorynus parategus sp. nov. PACO no. C-103 in Mexican amber. 1, dorsal view, scale bar equals 0.8 mm; 2, ventral view, scale bar equals 0.7 mm; and 3, lateral view, scale bar equals 0.7 mm.