Acronymolpus turbo, Samuelson, G. Allan, 2015

Samuelson, G. Allan, 2015, Acronymolpus, a new genus of Eumolpinae, endemic to New Caledonia (Coleoptera, Chrysomelidae), ZooKeys 547, pp. 93-102 : 95-96

Taxon classification Animalia Coleoptera Chrysomelidae

Acronymolpus turbo sp. n. Fig. 2 A–B

Description

(Holotype). Body robust, broadest across elytral posthumeral area, then strongly tapered to preapical region. Coloration reddish-piceous with paler yellowish apical elytral disc; antenna orange-testaceous. Dorsum glabrous. Body length 3.1 mm; body breadth 2.0 mm.

Head: frontal surfaces with general isodiametric sculpture; frons with several large, deep punctures above; oblique suture weak internally, becoming deeper along upper eye margin; vertex bearing several large punctures on each side of shallow coronal suture which ends near mid vertex; interantenal space rough, about 2.6 × as broad as transverse diameter of antennal socket; antennal socket and orbit subequal in breadth; interocular space about 1.3 × as broad as maximum diameter of eye; eye subovate, narrowed below; gena 0.5 × as deep as eye.

Antenna: slender, nearly reaching elytral apex; relative lengths of segments (cmm): 28: 16: 21: 21: 24: 24: 36: 32: 32: 34: 40; apical 2 segments heavier than preceding ones.

Prothorax: 0.55 × as long as broad; lateral margin slightly narrowed basally to mid-point, then more convexly narrowed to acutely produced anterior angle; disc closely and confusedly punctate; punctures deep and commonly 3-4 × as large as raised interspaces; only the antebasal area narrowly impunctate.

Elytron: robust basally across humeral region, then strongly narrowed posteriorly to preapical area, marked by an apical explanate margin originating at preapex of 7th interstrial interval; humerus briefly pustulate and smooth, and slightly heavier than inner basal costae; disc densely punctate-subtuberculate on inner part of basal disc where punctures are confused and about 1.5 × as large as pronotal ones; elytral interstices generally swollen, with a hint of microsculpture but nearly smooth and shining.

Ventral surfaces: prosternum nearly flat, surface ± rough and punctulate; hypomeron with fairly heavy isodiametric sculpture, surface impunctate; metasternum with slightly smoother sculpture, sparsely micropunctate; metacoxa nearly touching posterior margin of abdominal ventrite 1; relative lengths of ventrites (cmm): 40: 6: 6: 10: 18; surfaces subshining with hint of sculpture and sparsely micropunctate; first ventrite strongly inclined between coxae, surface irregular slightly swollen medially on inclined part, median area apparently lacking setose patch; last ventrite lacking median impression before apex.

Legs: slender; femora weakly subclavate; metatibia linear, as long as femur.

Measurements: BL 3.1 mm; BB 2.1 mm; HB 104 cm; IAS 26 cm; AS 10 cm; ORB 10 cmm; IOS 52 cmm; EYE 40 × 34 cmm; GENA 20 cmm; PNL 92 cm; PNB 168 cmm.

Paratype.

Essentially identical to holotype. BL 3.0 mm; BB 2.0 mm.

Holotype.

NEW CALEDONIA: Sarramea, Col d’Amieu, 2-23.xii.2005, Cazères, Mille, and Kataoui collectors (CXMNC/ MNHN); Paratype, same locality but 2-30.xi.2005, Cazeres, Mille, and Kataoui coll. (CXMNC).

Remarks.

Differs further from its close relative, Acronymolpus joliveti , sp. n., by having closer discal puncturation of the pronotum. The name refers to the stout, ± conical form of the elytra.