Rasilinus subgemellus, Mazur, Milosz A., 2016

Mazur, Milosz A., 2016, A new genus and nine new species of Eugnomini (Coleoptera, Curculionidae) from New Caledonia, ZooKeys 554, pp. 87-118 : 102

Taxon classification Animalia Coleoptera Curculionidae

Rasilinus subgemellus sp. n. Figs 6, 15, 24, 33, 42, 47, 64 ‒66, 82, 89, 103, 110, 117

Diagnosis.

The species is unique within the genus in having a pair of small nodules at the middle of the first ventrite of male; rostrum with distinct median keel; regularly rounded lateral margin of pronotum and parameroid lobes of tegmen with a pair of very short, sclerotised processes.

Description.

Body length (lb)ca. 3.60 mm.

Body colour and vestiture (Fig. 6). Pronotum, elytra and tibiae dark brown to blackish; femora brown with darker base and apex. Scape of antennae orange, funicle and club darker. Dorsal part of rostrum covered with white, suboval scales. Tarsus with strongly elongated, white scales, sometimes much longer than length of tarsomeres. Hind femora with distinct, transverse, wide stripe composed of small, suboval, white scales. Intervals with line of elongate, strongly protruding, dark scales. Abdomen dark orange, apical margins of ventrites and pair of nodules much darker.

Head, rostrum and antennae (Figs 24, 33, 42). Head subquadrate (hw/hlca. 1.10). Forehead slightly concave. Eyes relatively small, weakly convex laterally; slightly protruding above margin of head in lateral view; approximately as long as half-length of head (eyl/hlca. 0.40). Vertex distinctly convex, with irregular, dense punctation, strongly scabrous; lateral margin broadened, widely rounded near base. Rostrum almost as long as it is double width at apex (rl/arwca. 1.85), as long as head, weakly curved laterally; medially with distinct, protruding keel. Funicle shorter than scape; desmomere 1 strongly elongate, as long as 2-4 taken together; 2 slightly longer than 3; 3-7 slightly longer than wide. Club 2 × than wide, as long as desmomeres 3-7.

Pronotum (Figs 15, 24). Distinctly wider than long (mpw/plca. 1.25); laterally regularly rounded, narrowed subapically. Surface strongly rough, matt.

Elytra (Figs 15, 24). Elongate (el/mewca. 1.55), widest across humeral calli, weakly narrowed to middle of length, strongest apically. Striae narrow, composed of small punctures, slightly concave only at apical part. Intervals wide, flat, strongly rugose, shining.

Legs (Figs 64-66, 82). Fore and middle legs elongate, slender; femora with tooth at ventral side; tibiae slightly bisinuate, narrowed subapically. Hind tibiae regularly curved. Claws untoothed, basally distinctly, regularly broadened.

Abdomen (Fig. 47, 89). Slightly longer than wide. First ventrite with two distinct nodules; suture distinct laterally, medially obsolete. Sutures between ventrites 2-5 strongly depressed. Last ventrite wider than long; apical margin straight. Pygidium of male subquadrate, dorsal surface with sparse punctation. Apical margin with elongate setae. Ventral processes relatively small; with few, sparse setae.

Male terminalia (Figs 103, 110, 117). Aedegal pedon longer than apodemes, basal part unsclerotised, extended into pair of processes; apex strongly narrowed, acuminate. From lateral view curved irregularly with slightly upturned apex. Tegmen with subcircular tegminal ring; tegminal apodeme thin and short; parameroid lobes indistinct, composed of two fully separated, short processes, each surrounded by thin membrane. Basal part of sternite VIII irregularly bifurcate; hemisternites on sternite IX irregular, well visible.

Female. Unknown.

Measurements.

Holotype, ♂: apw 0.70; arw 0.35; bew 1.60; bpw 0.95; el 2.50; eyl 0.30; frw 0.20; hl 0.65; hw 0.60; lb 3.60; mew 1.60; mith 0.25; mpw 1.00; mth 0.35; pl 0.80; ptbl 0.85; ptbmw 0.15; rl 0.65; scl 0.70.

Type material.

Holotype, ♂- Loyality Is., Lifu, nr. We(Oue), 2-35m, 26-28.III.1968; T.C. Maa, Collector, Bishop; N.Z. Arthropod Collection, private bag 92170, Auckland, New Zealand (MNHN).

Etymology.

The specific epithet is derived from the Latin prefix sub– (on the lower side, beneath) and Latin adjective gemellus (paired, double) and refers to the pair of nodules situated on the first segment of the male abdomen.

Distribution.

New Caledonia (Lifou Island).