Rasilinus longulus, 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 : 99-102

Taxon classification Animalia Coleoptera Curculionidae

Rasilinus longulus sp. n. Figs 5, 14, 23, 32, 41, 61 ‒63, 81, 96, 123, 128, 133

Diagnosis.

The following combination of characters allows this species to be distinguished from its congeners: rostrum elongate, distinctly curved laterally; ventral margin of fore and middle femora glabrous, without teeth; tarsal claws untoothed; base of sternite VIII in female as enlarged plate with distinctive, deep recess.

Description.

Body length (lb)ca. 3.50 mm.

Body colour and vestiture (Fig. 5). Pronotum and elytra dark brown to blackish; head, rostrum and legs brighter; scape yellowish, funicle and club darker, brown. Dorsal surface of rostrum and outer margin of fore and middle tibiae with elongate, white scales. Hind femora with distinct transverse stripe composed of small, suboval, white scales. Pronotum entirely covered with short, indistinct, brown scales. Elytral intervals with line of protruding, elongate, dark scales.

Head, rostrum and antennae (Figs 23, 32, 41). Head subquadrate (hw/hl 0.90-1.00). Forehead flat. Eyes weakly convex laterally; protruding above margin of head in lateral view; half as long as head (eyl/hl; ca. 0.50); lateral margin of head strongly narrowed from base to hind margin of eyes. Vertex with sparse punctation, space between punctures rough, matt. Rostrum with length nearly 2 × its apical width (rl/arwca. 1.70), curved laterally; dorsal part with two types of scale: one short and adjacent and other elongate, strongly protruding; middle of rostrum with asetose longitudinal line. Funicle shorter than scape; desmomere 1 ca. 1.50 × as long as 2; 2 almost 2 × longer than 3; 3-7 slightly longer than wide. Club 2 × as long as it is wide, as long as desmomeres 3-7.

Pronotum (Figs 14, 23). Slightly longer than wide (mpw/plca. 1.15); side almost parallel, subapically distinctly narrowed; base and apical margin straight. Surface distinctly rough, matt.

Elytra (Figs 14, 23). Elongate (el/mewca. 1.65), widest at about one–third of length; distinctly narrowed to apex. Striae with small, elongate punctures; apically with punctures disappearing, forming indistinct line. Intervals rugose, flat.

Legs (Figs 61-63, 81). Femora robust; front and middle with ventral margin glabrous, without tooth. Tibiae elongate, slender; fore and middle straight, hind regularly curved. Claws untoothed, only broadened basally.

Abdomen. Elongate, ca. 1.20 × longer than wide. First suture obsolete along whole length. Sutures between ventrites 2-5 strongly depressed medially. Last ventrite subtriangular, widely rounded apically.

Female terminalia (Figs 96, 123, 128, 133). Abdominal tergite VIII massive, distinctly longer than wide; apex widely rounded, covered with long setae. Ovipositor slender, almost straight. Spermatheca L–shaped. Sternite VIII with long, thin apodeme; base with enlarged, suboval plate, deeply recessed medially.

Male. Unknown.

Measurements. Holotype, ♀/paratypes, ♀: apw 0.65/0.60-0.65; arw 0.35/0.30-0.35; bew 1.50/1.45-1.50; bpw 0.85/0.80-0.85; el 2.40/2.30-2.35; eyl 0.25/0.25; frw 0.15/0.15; hl 0.50/0.50-0.55; hw 0.50/0.45-0.50; lb 3.50/3.55-3.60; mew 1.50/1.45-1.50; mith 0.25/0.25; mpw 0.85/0.80-0.85; mth 0.45/0.45; pl 0.75/0.75; ptbl 0.80/0.80; ptbmw 0.10/0.10; rl 0.60/0.60; scl 0.65/0.60-0.65.

Type material.

Holotype, ♀ - 21°11'S / 165°17'E, Aoupinie, 850-900 m., 18.01.2007, forest, leg. M. Wanat & R. Dobosz (MNHN).

Paratype: 1♀, No. 8683, 20°58'S × 165°17'E, 500 m, Pic d’Amoa, N slopes, 10-24 Nov. 2001, leg C. Burwell & G. Monteith, malaise trap (QM); 1♀, No. 12003, 21°35'S × 165°51'E, 780 m, Mt. Rembai, top junction, 19 Dec 2004, leg. G. Monteith, beating, rainforest (QM).

Etymology.

The specific epithet is derived from the Latin adjective longus (long) and diminutive ending -ulus and refers to the elongate rostrum.

Distribution.

New Caledonia (main island, north and south provinces).