Cyptoxenus ovatus, 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 : 32-34

Cyptoxenus ovatus sp. nov.

Figure 18

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Holotype. Female; deposited in the PACO (accession # C-96).

Description. Length body, 2.5 mm; length rostrum, 0.3 mm. Body black with covering of dark dense decumbent setae. Rostrum wide, 0.4 times as long as pronotum, flattened, without dorsal median carina; antennal scrobes foveiform, dorsal; forehead wide, flat, densely punctate; eyes almost rounded, not emarginate, large, distinctly convex, upper edges not closer than lower edges; vertex weakly convex, densely punctate; temples short; antennae inserted dorsally at base of rostrum, elongate, reaching transversal prosternal carina; first antennomere (scape) 2.7 times longer than wide; funicle with second to eighth antennomeres elongate-conical; second antennomere 2.3 times longer than wide, equal in length and 1.2 times as wide as first antennomere; third to sixth antennomeres subequal in width; third antennomere 2.7 times longer than wide, 0.5 times as long as and 0.4 times as narrow as second antennomere; fourth antennomere 3.0 times longer than wide, 0.9 times as long as and equal in length to third antennomere; fifth antennomere subequal to fourth antennomere; sixth antennomere 2.0 times longer than wide, 0.9 times as long as fifth antennomere; seventh antennomere 1.9 times longer than wide, 1.2 times as long as and 1.2 times as wide as sixth antennomere; eighth antennomere 1.7 times longer than wide, 0.9 times as long as and subequal in width to seventh antennomere; club not compact, quite narrow, 0.8 times as long as funicle; first antennomere of club 3.0 times longer than wide, 3.0 times as long as and 1.7 times as wide as eighth antennomere. Pronotum bell-shaped; 1.4 times longer than wide at apex, 0.8 times longer than wide in middle and at base, with lateral carinae; disk weakly convex, densely punctate, transverse dorsal pronotal carina antebasal; distance between transverse carina and base of pronotum 0.11 times as long as pronotum; scutellum wide-trapezoidal. Elytra convex, 1.7 times longer than wide at base, 1.5 times longer than wide in middle, 2.9 times longer than wide at apical fourth, 2.4 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 flattened, quite narrow, 1.3–2.0 times as wide as striae, sparsely and weakly punctate; apices of elytra not rounded; pygidium not concealed. Thorax densely punctate; precoxal portion of prosternum long; postcoxal portion short; procoxal cavities narrowly separated; mesocoxal cavities widely separated, metanepisternum narrow. Abdomen convex; first ventrite 1.2 times as long as length of metacoxal cavities; second ventrite equal in length to length of first ventrite; third ventrite 0.9 times as long as length of second 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, almost reaching elytral margin; femora clavate, without teeth; trochanters obconical; profemora 3.8 times longer than wide; metafemora 4.3 times longer than wide; tibiae almost straight; protibiae 6.7 times longer than wide in middle; metatibiae 5.8 times longer than wide in middle; tarsi long; first to third tarsomeres conical; second tarsomere embracing third tarsomere laterally; fifth tarsomere 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 1.6 times longer than wide, 0.6 times as long as and 1.3 times as wide as first tarsomere; third tarsomere subequal in length and width, 0.5 times as long as and 0.8 times as wide as second tarsomere; fifth tarsomere 4.0 times longer than wide at base, 1.3 times as long as and 0.5 times as wide as second tarsomere; mesotarsi: first tarsomere 2.3 times longer than wide at base; second tarsomere equal in length and width, 0.7 times as long as and 1.5 times as wide as first tarsomere; metatarsi: first tarsomere 3.3 times longer than wide at base; second tarsomere 1.4 times longer than wide, 0.5 times as long as and 1.3 times as wide as first tarsomere; third tarsomere equal in length and width, 0.4 times as long as and 0.6 times as wide as second tarsomere; fifth tarsomere 4.4 times longer than wide at base, 3.7 times as long as and 0.8 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 ” ovatus ” equals oval, in reference to the oval shape of the eyes of the fossil.

Comparison. The new species is similar to C. buchelus sp. nov. but differs by the narrower body, shorter lateral pronotal carina and smaller body size.

Figures

FIGURE 18. Holotype of Cyptoxenus ovatus sp. nov. PACO no. C-96 in Dominican amber. 1, dorsal view, scale bar equals 0.5 mm; 2, ventral view, scale bar equals 0.5 mm; and 3, lateral view, scale bar equals 0.6 mm.