Cyptoxenus buchelus, 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 : 30-32

Cyptoxenus buchelus sp. nov.

Figure 17

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Holotype. Female; deposited in the PACO (accession # C-88).

Description. Length body, 2.5 mm; length rostrum, 0.3 mm. Body black with covering of dark dense, decumbent setae. Rostrum wide, 0.3 times as long as pronotum, weakly convex, without dorsal median carina; antennal scrobes foveiform, dorsal; forehead wide, weakly convex, densely punctate; eyes rounded, not emarginate, large, distinctly convex, 0.9 times longer than wide, upper edges not closer than lower edges; vertex weakly convex, densely punctate; temples short; antennae inserted dorsally at base of rostrum, elongate, almost reaching base of pronotum; first antennomere (scape) 6.0 times longer than wide; funicle with second to eighth antennomeres elongate-conical; second antennomere 5.7 times longer than wide, 1.1 times as long as and 1.2 times as wide as first antennomere; third to sixth antennomeres subequal; third antennomere 5.8 times longer than wide, 0.4 times as long as and 0.4 times as narrow as second antennomere; seventh antennomere 2.5 times longer than wide, 0.7 times as long as and 1.7 times as wide as sixth antennomere; eighth antennomere 2.0 times longer than wide, 0.8 times as long as and subequal in width to seventh antennomere; club not compact, quite narrow, 0.6 times as long as funicle; first antennomere of club 2.3 times longer than wide, 1.8 times as long as and 1.5 times as wide as eighth antennomere; second antennomere of club 3.7 times longer than wide, 1.6 times as long as and subequal in width to first antennomere of club; third antennomere of club 4.3 times longer than wide, 1.4 times as long as and 1.2 times as narrow as second antennomere of club. Pronotum bell-shaped; 2.2 times longer than wide at apex, 1.0 times longer than wide in middle and 1.2 times longer than wide at base, with 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 wide-trapezoidal. Elytra convex, 1.5 times longer than wide at base, 1.2 times longer than wide in middle, 1.8 times longer than wide at apical fourth, 1.5 times as long as pronotum; greatest width behind middle; without spots of setae; humeri weakly convex; striae regular and thin; strial punctures small, rounded, dense; elytral intervals weakly convex, quite wide, 2.0–2.8 times as wide as striae, sparsely and weakly punctate; apices of elytra not rounded; pygidium not concealed. Thorax densely punctate; prosternum coarsely punctate; precoxal portion of prosternum 1.4 times as long as procoxal cavities, 4.0 times as long as postcoxal portion; postcoxal portion 0.4 times as long as procoxal cavities; procoxal cavities narrowly separated; mesocoxal cavities widely separated, metanepisternum narrow, 6.2 times longer than wide in middle. Abdomen convex; first ventrite 0.9 times as long as length of metacoxal cavity; second ventrite 1.1 times as long as length of first ventrite; third ventrite equal in length to length of second ventrite; fourth ventrite 0.7 times as long as length of third ventrite; fifth ventrite 1.3 times as long as length of fourth ventrite. Legs long; pro- and mesocoxae round; metacoxae transverse, almost reaching elytral margin; femora clavate, without teeth; trochanters obconical; profemora 3.2 times longer than wide; mesofemora 2.9 times longer than wide; metafemora 4.1 times longer than wide; tibiae almost straight; protibiae 9.7 times longer than wide in middle; metatibiae 7.0 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 2.3 times longer than wide at base; second tarsomere equal in length and width, 0.7 times as long as and 1.7 times as wide as first tarsomere; third tarsomere subequal in length and width, 0.6 times as long as and 0.7 times as wide as second tarsomere; fifth tarsomere 5.0 times longer than wide at base, 2.0 times as long as and 0.4 times as wide as second tarsomere; metatarsi: second tarsomere 0.6 times as long as first tarsomere; third tarsomere 0.6 times as long as second tarsomere; fifth tarsomere 2.7 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 “bu” equals large (as a prefix) and the Latin “chela” equals claw, in reference to the large claws.

Comparison. The new species differs from C. sigillatus Valentine, 1982 from Jamaica by the elongate body, narrower antennal club and absence of setal spots on the first and second antennomeres and elytra.

Remarks. Both new species are placed in the genus Cyptoxenus because of the lateral pronotal carina, weakly convex elytral humeri and pubescent body.

Figures

FIGURE 17. Holotype of Cyptoxenus buchelus sp. nov. PACO no. C-88 in Dominican amber. 1, dorsal view, scale bar equals 0.5 mm; 2, ventral view, scale bar equals 0.4 mm; and 3, lateral view, scale bar equals 0.7 mm.