Acronymolpus joliveti, 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

Taxon classification Animalia Coleoptera Chrysomelidae

Acronymolpus joliveti sp. n. Fig. 1 A–E

Description

(Holotype female). Body stout, fusiform, broadest across elytral humeral area, then strongly tapered to preapex. Body surfaces largely castaneous; elytron with inner interstices becoming paler orangish along apical half; antenna yellow- to orange-testaceous; legs castaneous. Dorsum glabrous; mesosternum and central part of abdominal ventrite 1 sparsely setose. Body length 3.3 mm; body breadth 2.2 mm.

Head: frontal surfaces smooth with hint of isodiametric sculpture; frons with a few large deep punctures mostly above middle; postantennal swellings ± triangular, surfaces nearly smooth; oblique suture becoming a deep sharp sulcus along upper eye margin; vertex with a few large deep punctures on each side near beginning of deep coronal suture; interantennal space flat, about 2.6 × as broad as transverse diameter of antennal socket; antennal socket and orbit with breadths subequal; interocular space about 1.4 × as broad as maximum eye diameter; eye subovate, moderately narrowed below; gena slightly over 0.6 × as deep as eye.

Antenna: slender, attaining apical 1/3 of elytron; relative lengths of segments (cmm units = 1/100 mm): 28: 14: 24: 26: 28: 28: 34: 34: 32: 32: 40; segments 3-6 slender, very slightly broadened apically; 7-10 distinctly heavier than preceding; last gradually thickened to apical 1/3, then narrowed to acute apex.

Prothorax: 0.57 × as long as broad; lateral margin moderately and evenly convex from base to apex; disc moderately punctate; central punctures somewhat ovate and commonly 1-2 × as large as interspaces; interspaces nearly smooth and shining with occasional micropunctures and nearly obsolete fine sculpture.

Elytron: smooth and shining; lateral margin beyond broad basal region strongly narrowed posteriorly to knob-like extremity at side of sutural apex; humerus weakly swollen, mostly smooth; discal punctures larger and deeper than pronotal ones and commonly 1-2 × as large as interspaces; interspaces commonly ± costate to subtuberculate.

Ventral surfaces: prosternum with surface dull-punctulate; hypomeron subshining, with obsolescent fine sculpture; metasternum broad, smooth-shining with fine sculpture, sparsely micropunctate; metacoxae nearly touching posterior margin of abdominal ventrite 1; relative lengths of abdominal ventrites (cmm): 48: 10: 10: 12: 20; surfaces subshining, with fine sculpture; first ventrite with median part acutely triangular and strongly inclined between coxae; last ventrite lacking median impression before apex.

Legs: slender; femora subclavate, smooth with obsolescent sculpture but sparsely punctulate; metatibia just as long as femur.

Measurements: BL 3.3 mm; BB 2.3 mm: HB 110 cmm; IAS 26 cmm; AS 8 cmm; ORB 8 cmm; IOS 58 cmm; EYE 41 × 31 cmm; GENA 26 cmm; PNB 176 cmm; PNL 102 cmm.

Paratype

(Female). Fig. 1 D–E. Essentially identical to holotype. Spermatheca J-shaped, slender, as figured. BL 3.2 mm; BB 2.15 mm.

Holotype

♀. NEW CALEDONIA: Vallée d’Amoa, 7.ii.1963, C.M. Yoshimoto collector (BPBM HT16,842); Paratype ♀, Mt Panie trail, 550 m, 9.ii.1963, G. Kuschel coll. (BPBM).

Remarks.

Near Acronymolpus turbo , sp. n. in general stature, including the close proximity of the metacoxae to the apical margin of the first abdominal ventrite; both species also have ornamentation on the elytral preapex - knob-like in this species and briefly explanate in Acronymolpus turbo . The name honors Prof. Pierre Jolivet of Paris, who has charted our knowledge of Chrysomelidae in general and of New Caledonia in particular.