Rasilinus subnodulus, 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 : 102-106

Taxon classification Animalia Coleoptera Curculionidae

Rasilinus subnodulus sp. n. Figs 7, 16, 25, 34, 43, 48, 67 ‒69, 83, 90, 97, 104, 111, 118, 124, 129, 134

Diagnosis.

The species is unique within the genus in having a strongly convex pronotum and elytral disc; large tubercle in the middle of first ventrite in male; internal sac with characteristic sclerite with two elongate lobes; tegmen with parameroid lobes completely divided into two, thin parameres. Spermatheca of female slender and strongly curved; apex of sternite VIII T–shaped with well-developed, split almost to base, hemisternites.

Description.

Body length (lb) 3.20-3.60 mm.

Body colour and vestiture (Fig. 7). Head, pronotum and elytra dark brown to blackish ventrally and dorsally. Legs varying from uniformly reddish to blackish with lighter medial part of femora or blackish basal part. Scape of antennae orange, funicle and club darker. Tarsi same colour as tibiae, sometimes last tarsomere lighter.

Head, rostrum and antennae (Figs 25, 34, 43). Head subquadrate (hw/hl ca 1.10). Forehead flat, wide (frw/hwca. 0.45). Eyes distinctly convex laterally; length approximately half length of head (eyl/hlca. 0.45). Vertex with distinctive, deep punctation, surface rough. Rostrum as long as head or longer (rl/hl 1.00-1.20), distinctly curved, punctures only laterally, glabrous medially and matt on apical third. Funicle as long as scape; desmomere 1 as long as 1-2 taken together; 2 longer than 3; 3-7 subquadrate. Club 2 × than wide, as long as desmomeres 3-7.

Pronotum (Figs 16, 25). Subquadrate (mpw/pl = 1.00-1.07); dorsally equilateral at base, strongly narrowed at apical half. Disc distinctly convex. Surface distinctly rough, densely punctate, matt.

Elytra (Figs 16, 25). Elongate (el/mew = 1.40-1.58), widest across humeral calli, regularly narrowed from base to apex. In lateral view distinctly convex. Striae narrow, composed of small punctures, becoming evidently smaller to obsolescent from middle of disc towards apex. Intervals wide, flat, glabrous, slightly shining.

Legs (Figs 67-69, 83). Fore tibiae distinctly narrowed apically; femora with minute tooth near midlength. Mid legs similar, tibiae weakly narrowed apically; femora with distinct tooth beyond midlength. Hind tibiae regularly curved. Claws weakly curved, basally with broadly rounded tooth and two pairs of elongate setae: one on bottom and second on upper side of the claw.

Abdomen (Figs 48, 90). Elongate, ca. 1.20 × as long as maximum width at base. First ventrite with one distinct median nodule. Sutures between ventrites 2-5 strongly depressed. Last ventrite wider than long, slightly narrowed apically. Pygidium of male longer than wide, apical margin straight with elongate setae; inner folds distinct, asetose.

Male terminalia (Figs 104, 111, 118). Aedegal pedon longer than apodemes; lateral margins parallel with weak concavity at middle of length; apex widely rounded. In lateral view nearly straight basally, curved more strongly distally, slightly narrowed apically; basal part sclerotised, narrowed, extended into prominent, acute process. Endophallus with well visible transfer apparatus with pair of prominent process. Tegmen well sclerotised, incised to the base parameroid lobes; tegminal apodeme stout, broadened apically, as long as diameter of tegminal ring. Basal part of sternite VIII arrow–shaped, hemisternites on sternite IX elongate, well visible.

Female (Figs 97, 124, 129, 134). Similar to male body shape but slightly larger. Rostrum more elongate than in male (rl/arw 1.50-1.70, in male ca. 1.40). First ventrite of abdomen without nodule, glabrous; last ventrite widely rounded. Abdominal tergite VIII wider than long with incrassate outer margin and elongate setae; surface sparsely punctate and with isolated short setae; apical margin rounded. Spermatheca strongly curved. Gonocoxite stout, conical. Apodeme of sternite VIII split into pair of short, acute processes connected with well-developed hemisternites.

Measurements.

Holotype, ♂: apw 0.65; arw 0.35; bew 1.45; bpw 0.80;el 2.20; eyl 0.25; frw 0.25; hl 0.50; hw 0.55; lb 3.50; mew 1.45; mith 0.25; mpw 0.80; mth 0.40; pl 0.75; ptbl 0.90; ptbmw 0.15; rl 0.50; scl 0.60.

Paratypes, ♂/♀: apw 0.65-0.70/0.75; arw 0.35/0.35-0.40; bew 1.45 –1.60/1.60– 1.65; bpw 0.80 –0.90/0.90– 1.00; el 2.20 –2.40/2.25– 2.60; eyl 0.25/0.25-0.30; frw 0.25/0.20-0.25; hl 0.40 –0.55/0.50– 0.60; hw 0.55 –0.60/0.55– 0.60; lb 3.25 –3.50/3.50– 3.60; mew 1.45 –1.60/1.60– 1.65; mith 0.25/0.25; mpw 0.80 –0.90/0.90– 1.00; mth 0.40 –0.45/0.40– 0.45; pl 0.75 –0.90/0.75– 0.80; ptbl 0.80 –1.00/0.95– 1.00; ptbmw 0.150.20/0.15-0.20; rl 0.45 –0.50/0.60– 0.65; scl 0.55 –0.65/0.65– 0.70.

Type material.

Holotype, ♂ - 21°11.0'S 165°17.6'E; Aoupinié, 700-900 m.; 18.01.2007, forest; leg. R. Dobosz & M. Wanat (MNHN).

Paratypes: 1♀-No. 11975; 20°58' S× 165°17'E, 480m.; Pic d’Amoa, north slope; 3 Jan 2005, rainforest; G. Monteith, beating (QM); 1♀-No. 11986; 21°09' S× 165°19'E, 500m.; Aoupinié, lower east road; 17Dec2004; G. Monteith, beating, rainforest (QM); 1♀-No. 11984; 21°09' S× 165°19'E, 500m.; Aoupinié, sawmill; 2 Jan 2005; G. Monteith, beating, rainforest (QM); 1♀-No. 11981; 21°09' S× 165°19'E, 500m.; Aoupinié, sawmill; 17 Dec 2004; G. Monteith, MV light, rainforest (QM); 1♀ –450– 550 m., 5.2.63, Kuschel leg.; Col. d.Rousseltes (NZAC); 2♀♀- 21°00.3'S 165°14.9'E; Tchamba ( Wâo Uni); 15.01.2007, refuge, 400 m.; night coll. (lamp & beating) leg. M. Wanat & R. Dobosz (MNHW); 1♀- 21°10.8'S 165°18.1'E; Aoupinié, 650 m.; 18.01.2007, night beating; leg. M. Wanat (MNHW); 3♂♂- 21°11.0'S 165°17.6'E; Aoupinié, 700-900 m.; 18.01.2007, forest; leg. R. Dobosz & M. Wanat (MNHW); 1♀ -21.14890/165.32348; Aoupinié (refuge), 400 m.; beating rainforest; 29.11.2008; leg. M. Wanat (MNHW); 1♀-20.95280/165.29135; Pic d’Amoa (Povila), 400 m., rainforest; 22.11.2008; leg. M. Wanat (MNHW); 1♂- 21°00.3'S 165°14.9'E; Tchamba ( Wâo Uni); 1.04.2008, day, rainforest; leg. T. Blaik (DBUO).

Etymology.

The specific epithet is derived from the Latin prefix sub– (on the lower side, beneath) and Latin noun nodulus (knob, tubercle) and refers to the distinct nodule situated on the first segment of the male abdomen. A noun in apposition.

Distribution.

New Caledonia (main island, north province).