Anchonus bothynus, Poinar & Legalov, 2019

Poinar, George & Legalov, Andrei A., 2019, Two new species of the genus Anchonus Schoenherr, 1825 (Coleoptera: Curculionidae: Molytinae) in Dominican amber, Palaeontologia Electronica 22 (3), pp. 1-10 : 5-7

Anchonus bothynus sp. nov.

Figures 6-9

zoobank.org/ 993962DA-1839-412B-8354-264ECD97B4C8

Holotype. Deposited in the American Museum of Natural History (USA, New York) ( AMNH no. DR-8- 396).

Description. The specimen is complete. Body length (without rostrum), 5.9 mm; rostrum length, 1.3 mm. Body black, convex dorsally, with curved scales extending to apex.

Head capsule not constricted behind eyes. Mandibles small. Rostrum elongate, 3.7 times as long as wide in middle and at base, curved, punctate, lacking carinae, separated from head by furrow. Antennal scrobes visible from above anteriorly, directed under but not reaching eyes. Antennae long, thin, geniculate, inserted in apical third of rostrum. Antennomeres subconical; first antennomere not reaching eyes, 9.0 times as long as wide; second antennomere 2.5 times as long as wide, 0.2 times as long as and 0.7 times as narrow as first antennomere; third antennomere 2.1 times as long as wide, 0.8 times as long as second antennomere; fourth antennomere 1.8 times as long as wide; fifth antennomere 1.4 times as long as wide, 0.9 times as long as fourth antennomere; sixth antennomere 1.4 times as long as wide, 0.9 times as long as fifth antennomere; seventh antennomere 1.3 times as long as wide, 0.9 times as long as sixth antennomere; club compact. Eyes oval, not protruding from head. Forehead wide.

Pronotum with arcuate sides, 1.2 times as long as length of rostrum, 1.4 times as long as wide at apex, 0.8 times as long as wide in middle and 0.9 times as long as wide at base; disc flattened, densely and coarsely punctate, without tubercles. Widest before middle. Scutellum absent.

Elytra wide, 2.2 times as long as pronotum, 1.6 times as long as wide at base, 1.3 times as long as wide in middle, 1.9 times as long as wide in apical fourth; with smoothed humeri, all intervals similar, convex, narrower than striae; punctate striae regular; ninth and tenth striae not merging at level of mesocoxae.

Prosternum not excavated, with postocular lobe. Precoxal portion of prosternum long. Procoxal cavities rounded, located before base of prosternum, connected. Postcoxal portion of prosternum short. Mesocoxal cavities rounded and separated. Metaventrite short, 0.9 times as long as length of metacoxal cavity. Metanepisterna absent. Abdomen flattened; first to fifth ventrites oriented in one plane; first and second ventrites elongate and fused, suture between them visible, first ventrite 1.8 times as long as metacoxal cavity; second ventrite 0.7 times as long as first ventrite; third and fourth ventrites short.

Legs long. Metacoxae almost subglobular, reaching margin of elytra. Trochanters not separating femora and coxae. Femora thickened and punctate, without teeth; mesofemur about 4.5 times as long as wide; metafemur about 4.2 times as long as wide. Tibiae almost straight, with apical comb of setae, with uncus and two distinct groups of setae, small mucro; uncus larger than claws; protibiae 4.6 times as long as wide in middle; metatibiae 4.2 times as long as wide in middle. Tarsi quite long, pseudotetramerous; first and second tarsomeres trapezoidal; third tarsomere bilobed; fifth tarsomere long. Claws free, without teeth.

Type Locality. Amber mine in the northern portion of the Dominican Republic.

Etymology. The species epithet is taken from the Greek “bothynos” = pit, in reference to the densely punctate pronotum.

Remarks. The new species is very close to Anchonus acrolepidotus sp. nov. but differs by the elytral intervals convex, pronotum densely punctate, wider elytra, suture between first and second ventrites visible, wider tibiae, and larger body size.

Key to species of the genus Anchonus from Hispaniola

1. Rostrum separated from head by strong furrow. Body with subparallel scales. Tarsal claws thin and small...................... Anchonus suillus

- Rostrum separated from head by weak furrow. Body with scales extending to the apex. Tarsal claws thick and large......................2

2. Elytral intervals flat. Pronotum rarely punctate. Elytra 1.6 times as long as wide in middle. Body size small (3.5 mm)............. Anchonus acrolepidotus sp. nov.

- Elytral intervals convex. Pronotum densely punctate. Elytra 1.3 times as long as wide in middle. Body size large (5.9 mm)................. Anchonus bothynus sp. nov.

Figures

FIGURE 6. Dorsal view of Anchonus bothynus sp. nov. in Dominican amber. Bar equals 1.0 mm.

FIGURE 7. Drawing of dorsal view of Anchonus bothynus sp. nov. in Dominican amber. Bar equals 1.0 mm.

FIGURE 8. Lateral view of Anchonus bothynus sp. nov. in Dominican amber. Bar equals 1.0 mm.

FIGURE 9. Drawing of lateral view of Anchonus bothynus sp. nov. in Dominican amber. Bar equals 1.0 mm.