Anchonus acrolepidotus, 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 : 2-5

Anchonus acrolepidotus sp. nov.

Figures 1-5

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Holotype. Deposited in Poinar amber collection maintained at Oregon State University, Corvallis (USA: Oregon) (accession # D-C-16A ).

Description. The specimen is complete, however, some air bubbles are adhering to its body. Body length (without rostrum), 3.5 mm; rostrum length, 0.7 mm. Body dark brown to black. Antennae and legs brown. Body convex dorsally, with curved scales extended to apex.

Head capsule not constricted behind eyes. Mandibles small. Rostrum elongate, 3.4 times as long as wide at apex, 3.0 times as long as wide in middle and at base, weakly curved, densely 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 subequal to second antennomere; fourth to eighth antennomeres subequal in width; fourth antennomere 2.5 times as long as wide, 0.5 times as long as third antennomere; fifth antennomere subequal to third antennomere; sixth antennomere 1.1 times as long as wide; sixth to eighth antennomeres subequal in length; club compact, 3.0 times as long as wide; ninth antennomere 0.9 times as long as wide, 1.4 times as long as and 1.7 times as wide as eighth antennomere; suture between tenth and eleventh antennomeres absent. Eyes oval, not protruding from head, placed low down. Temples short. Forehead quite wide, narrower than rostrum base width, flattened.

POINAR & LEGALOV: NEW ANCHONUS IN DOMINICAN AMBER

Pronotum with arcuate sides, 1.5 times as long as length of rostrum, 1.3 times as long as wide at apex, 0.9 times as long as wide in middle, and 1.2 times as long as wide at base; disc flattened, rarely and coarsely punctate, without tubercles. Greatest width before middle. Scutellum absent.

Elytra quite wide, 1.9 times as long as pronotum, 1.6 times as long as wide at base, 1.6 times as long as wide in middle, 2.2 times as long as wide in apical fourth; with smoothed humeri, all intervals similar, flat, narrow, 0.9-1.0 times as long as width of striae, smooth; punctate striae with punctures distinct, regular, as long as or larger than intervals; ninth and tenth striae not merging at level of mesocoxae.

Prosternum not excavated, with postocular lobe. Precoxal portion of prosternum long, 1.5 times as long as precoxal cavity length. Procoxal cavities rounded, located before base of prosternum, connected. Postcoxal portion of prosternum 0.5 times as long as length of precoxal cavity. Mesocoxal cavities rounded and separated. Metaventrite convex and short, 0.9 times as long as metacoxal cavity. Metanepisterna absent. Abdomen flattened; first to fifth ventrites oriented in one plane; first and second ventrites elongate and fused, suture between them not visible, first ventrite about 2.1 times as long as metacoxal cavity; second ventrite subequal in length to first ventrite; third ventrite about 0.3 times as long as second ventrite; fourth ventrite equal in length to third ventrite; fifth ventrite 2.6 times as long as fourth ventrite, with anal setae.

Legs long. Metacoxae almost subglobular, reaching margin of elytra. Trochanters not separating femora and coxae. Femora thickened and punctate, without teeth; profemur 4.4 times as long as wide; metafemur 4.8 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 6.6 times as long as wide in middle; metatibiae 8.6 times as long as wide in middle. Tarsi quite long, pseudotetramerous; first and second tarsomeres trapezoidal; third tarsomere bilobed; fifth tarsomere long. Protarsi: first tarsomere 2.9 times as long as wide; second tarsomere 1.7 times as long as wide, 0.7 times as long as and subequal in width to first tarsomere; third tarsomere 1.1 times as long as wide, 1.1 times as long as and 1.7 times as wide as second tarsomere; fifth tarsomere 4.0 times as long as wide, 1.5 times as long as and 0.4 times as narrow as third tarsomere; mesotarsi: first tarsomere 1.7 times as long as wide; second tarsomere 1.3 times as long as wide, 0.8 times as long as and subequal in width to first tarsomere; third tarsomere equal in length and width, 1.5 times as long as and 2.0 times as wide as second tarsomere; fifth tarsomere 3.0 times as long as wide, 1.5 times as long as and 0.5 times as narrow as third tarsomere; metatarsi: first tarsomere 1.5 times as long as wide; second tarsomere 1.3 times as wide as long, 0.8 times as long as and subequal in width to first tarsomere; third tarsomere equal in length and width, 1.2 times as long as and 1.3 times as wide as second tarsomere; fifth tarsomere 3.7 times as long as wide, 1.8 times as long as and 0.5 times as narrow as third tarsomere. Claws free, without teeth.

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

Etymology. The species epithet is based on the Greek “akron” = tip and the Greek “lepidotos” = scaly, in reference to the curved scales that extend to the apex of the body.

Remarks. The new species is similar to Anchonus suillus (Fabricius, 1792) from Hispaniola, Guadeloupe, and Puerto Rico, but differs in having its body with curved scales extending to the apex, rostrum separated from the head by a weak furrow, thicker and larger tarsal claws, and a smaller body size.

Figures

FIGURE 1. Dorsal view of Anchonus acrolepidotus sp. nov. in Dominican amber. Bar equals 0.7 mm.

FIGURE 2. Drawing of dorsal view of Anchonus acrolepidotus sp. nov. in Dominican amber. Bar equals 1.0 mm.

FIGURE 3. Ventral view of Anchonus acrolepidotus sp. nov. in Dominican amber. Bar equals 0.7 mm.

FIGURE 4. Lateral view of Anchonus acrolepidotus sp. nov. in Dominican amber. Bar equals 0.7 mm.

FIGURE 5. Drawing of lateral view of Anchonus acrolepidotus sp. nov. in Dominican amber. Bar equals 1.0 mm.