Research Article |
Corresponding author: Milosz Mazur ( milosz@uni.opole.pl ) Academic editor: Miguel Alonso-Zarazaga
© 2016 Milosz Mazur.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Mazur MA (2016) A new genus and nine new species of Eugnomini (Coleoptera, Curculionidae) from New Caledonia. ZooKeys 554: 87-118. https://doi.org/10.3897/zookeys.554.6120
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The genus Rasilinus gen. n. is described (type species Rasilinus tchambicus sp. n.). Nine new species: Rasilinus bicolor sp. n., R. bifurcatus sp. n., R. bimaculatus sp. n., R. grandidens sp. n., R. longulus sp. n., R. subgemellus sp. n., R. subnodulus sp. n., R. tchambicus sp. n., R. virgatus sp. n. are described from New Caledonia. Illustrations of the external morphology, male and female terminalia, dorsal habitus colour photographs of the adults, key to species and distribution map of the new genus Rasilinus are provided.
Coleoptera , Curculionidae , Curculioninae , Eugnomini , Rasilinus , new genus, new species, New Caledonia, distribution, key to species
The Eugnomini is a small, poorly studied tribe of the speciose family Curculionidae. The classification, biogeography, and biology of most species are poorly known. Currently, Eugnomini comprises about 200 known species included in 28 genera and is primarily an Old World group occurring in New Zealand (19 genera), Australia (five), New Caledonia (three) and New Guinea (one) (
This paper presents descriptions of a new genus and nine species of Eugnomini from New Caledonia along with a key to all new species.
This study is based on 37 specimens. Holotypes are deposited in the
DBUO
Department of Biosystematics, Opole
MNHW
USMB
Natural History Department of
Measurements were taken using a calibrated stereomicroscopic grid eyepiece (C–W10xB/22) and stereomicroscope NIKON SMZ–800. Genitalia preparations were made according to the standard method of macerating the separated abdomen for 5–10 minutes in a hot KOH solution. Photographs were taken using the camera a CANON Power Shot A640 camera connected with the stereomicroscope and processed using the Helicon Focus v. 4.50 and PhotoFiltre v. 6.1 software programmes.
The nomenclature of the male terminalia and abbreviations of particular measurements (partly modified) follows
apw pronotum width at anterior margin;
arw width of rostrum apex;
bew width of elytral base (measured through the middle of humeral calli);
bpw pronotum width at the base;
el elytra length, measured in top view in a position when the base and apex of elytra are at the same level;
eyl eye length, measured in top view, when the head is positioned horizontally;
frw minimum frons width;
hl head length;
hw head width, measured across the middle of the eyes;
lb length of body exclusive of rostrum;
mew maximum elytra width;
mith minimum height of tooth on hind femur, measured from basal part of femur (shorter edge);
mpw maximum pronotal width;
pl pronotum length;
ptbl protibia length;
ptbmw maximum width of fore tibia;
mth maximum height of tooth on hind femur; measurement from apex of femur (longer edge);
rl rostrum length, measured in top of view, when base and apex of rostrum are in the same level;
scl antennal scape length.
The nomenclature of antennal parts follows Lyal (http://weevil.info/glossary-weevil-characters).
All dimensions are given in millimetres.
Rasilinus tchambicus sp. n. Gender masculine.
Body massive; elytra narrowed, smooth, without any tubercles or spines, not covered with adjacent scales, sculpture of elytra clearly visible; hind femora stout, strongly clavate with large tooth, their basal part stout.
Size 2.5–3.6 mm. Body stout, distinctly convex transversally. Rostrum dorsoventrally flattened, as long as head or slightly longer; dorsal surface covered with white, more or less protruding, elongate scales, sometimes mixed with additional white scales which are suboval and adjoining. Antennae inserted on apical part of rostrum; funicle with seven antennomeres; scape reaching posterior margin of eye. Scrobe deep in lateral view with sharp edges; partly visible in dorsal view of rostrum; not passing along ventral part and not reaching front margin of eyes. Eyes weakly to strongly convex. Frons narrower than base of rostrum. Pronotum subquadrate. Elytra widest at basal half, distinctly and regularly narrowed to apex; apically truncate or rounded; humeral calli weakly or strongly prominent, posterior calli absent. Surface of elytra glabrous, more or less shining; intervals wider than striae with single line of short, protruding, inclined backward setae; entire surface in some species covered with extremely small, hardly visible, piliform setae. Second pair of wings well developed. Front coxae contiguous. Trochanters small, fusiform. Posterior margin of metaventrite with distinct line of dense, closely adjoining, white scales. All femora covered with sparse, elongate scales. Outer margin of tibiae covered with white, elongate scales. Hind femora broadened, clavate with enlarged tooth; dorsal surface with contrasting, transverse stripe of white scales (except R. subnodulus sp. n.); posterior margin of tooth on hind femora with two types of piliform setae: one short and straight and other elongate and hooked apically. Hind tibiae strongly curved. Segments of front and middle tarsi similar in length; first tarsal segment of hind tarsi elongate, as long as 2+3 or longer. Male pygidium (tergite VIII) with two narrow processes on ventral side. Tegmen with elongate or very short parameres. Penis well sclerotised, most species with fully sclerotised base of pedon (here, basal part of pedon is the anterior ventral margin of the penis body between the apodemes) and variable, well visible structures in internal sac.
The generic name is derived from the Latin adjective rasilis (smooth) and refers to the elytral sculpture. Gender masculine.
Detailed biology unknown. Other members of Eugnomini have been reared from dead wood, subcortical tissues, live stems, galls, leaves or fruits of many species of plants in different families (e.g.
One of the smallest members of new genus. The following combination of characters allows this species to be distinguished from its congeners: rostrum short and relatively thin with compare to its congeners, almost as long as head; pronotum wider than long; elytra weakly narrowed; minute tooth on fore and middle femora; apodemes much longer than aedegal pedon; tegmen with completely separated parameroid lobes.
Body length (lb)ca. 2.50 mm.
Body colour and vestiture (Fig.
Dorsal habitus colour photographs of New Caledonian species from the genus Rasilinus gen. n. 1 Rasilinus bicolor sp. n., paratype, ♀, Mandjélia (MNHW) 2 R. bifurcatus sp. n., holotype, ♂, Auopinié, (
Head, rostrum and antennae (Figs
Antennae (37–45) and abdominal sternites (46–48): 37 Rasilinus bicolor sp. n. 38 R. bifurcatus sp. n. 39 R. bimaculatus sp. n. 40 R. grandidens sp. n. 41 R. longulus sp. n. 42 R. subgemellus sp. n. 43 R. subnodulus sp. n. 44 R. tchambicus sp. n. 45 R. virgatus sp. n. 46 R. bimaculatus sp. n. 47 R. subgemellus sp. n. 48 R. subnodulus sp. n.
Legs: Rasilinus bicolor sp. n.: 49 front leg 50 middle leg 51 hind leg R. bifurcatus sp. n.: 52 front leg 53–middle leg 54 hind leg R. bimaculatus sp. n.: 55 front leg (minute tooth marked by arrow) 56 middle leg 57 hind leg R. grandidens sp. n.: 58 front leg 59 middle leg 60 hind leg R. longulus sp. n.: 61 front leg 62 middle leg 63 hind leg R. subgemellus sp. n,: 64 front leg 65–middle leg 66 hind leg.
Pronotum (Figs
Elytra (Figs
Legs (Figs
Legs (67–75) and tarsal claws (77–85): Rasilinus subnodulus sp. n.: 67 front leg 68 middle leg 69 hind leg R. tchambicus sp. n.: 70 front leg 71 middle leg 72 hind leg R. virgatus sp. n.: 73 front leg 74 middle leg 75 hind leg 76 hind femora, dorsal view of: a –Pactola (Pasc.) and b–Rasilinus gen. n. 77 R. bicolor sp. n. 78 R. bifurcatus sp. n. 79 R. bimaculatus sp. n. 80 R. grandidens sp. n. 81 R. longulus sp. n. 82 R. subgemellus sp. n. 83 R. subnodulus sp. n. 84 R. tchambicus sp. n. 85 R. virgatus sp. n.
Abdomen (Fig.
Terminalia. Male pygidium, ventral view (86–92), female pygidium, dorsal view (93), female abdominal tergite VIII, dorsal view (94–98) and last ventrite of male (99): 86 Rasilinus bicolor sp. n. 87 R. bifurcatus sp. n. 88 R. bimaculatus sp. n. 89 R. subgemellus sp. n. 90 R. subnodulus sp. n. 91 R. tchambicus sp. n. 92 R. virgatus sp. n. 93 R. grandidens sp. n. 94 R. bicolor sp. n. 95 R. grandidens sp. n. 96 R. longulus sp. n. 97 R. subnodulus sp. n. 98 R. tchambicus sp. n. 99 R. bifurcatus sp. n.
Male terminalia (Figs
Male terminalia. Aedeagus, dorsal and lateral view (100–106) spiculum gastrale, dorsal view (107, 108, 110, 111) spiculum gastrale, dorsal and lateral view (109, 112, 113): 100 Rasilinus bicolor sp. n. 101 R. bifurcatus sp. n. (e–endophallus with characteristic sclerites) 102 R. bimaculatus sp. n. 103 R. subgemellus sp. n. 104 R. subnodulus sp. n. 105 R. tchambicus sp. n. 106 R. virgatus sp. n. 107 R. bicolor sp. n. 108 R. bifurcatus sp. n. 109 R. bimaculatus sp. n. 110 R. subgemellus sp. n. 111 R. subnodulus sp. n. 112 R. tchambicus sp. n. 113 R. virgatus sp. n.
Terminalia. Male tegmen (114–120), female ovipositor (121–125) and spermatheca (126–130) : 114 Rasilinus bicolor sp. n. 115 R. bifurcatus sp. n. 116 R. bimaculatus sp. n. 117 R. subgemellus sp. n. 118 R. subnodulus sp. n. 119 R. tchambicus sp. n. 120 R. virgatus sp. n. 121 R. bicolor sp. n. 122 R. grandidens sp. n. 123 R. longulus sp. n. 124 R. subnodulus sp. n. 125 R. tchambicus sp. n. 126 R. bicolor sp. n. 127 R. grandidens sp. n. 128 R. longulus sp. n. 129 R. subnodulus sp. n. 130 R. tchambicus sp. n.
Female (Figs
Holotype, ♂: apw 0.45; arw 0.25; bew 1.10; bpw 0.60; el 1.50; eyl 0.25; frw 0.15; hl 0.35; hw 0.45; lb 2.45; mew 1.10; mith 0.15; mpw 0.60; mth 0.30; pl 0.50; ptbl 0.55; ptbmw 0.10; rl 0.35; scl 0.45.
Paratypes, ♂/♀: apw 0.45–0.50/0.55; arw 0.25–0.30/0.30; bew 1.10–1.25/1.30–1.35; bpw 0.60–0.70/0.70–0.75; el 1.50–1.80/1.90–2.00; eyl 0.25/0.25; frw 0.15/0.15; hl 0.35–0.40/0.35; hw 0.35–0.45/0.45–0.50; lb 2.45–2.80/2.75–2.90; mew 1.10–1.25/1.35–1.45; mith 0.15–0.20/0.20; mpw 0.60–0.70/0.70–0.75; mth 0.30–0.40/0.35; pl 0.50–0.55/0.60–0.65; ptbl 0.55–0.70/0.65; ptbmw 0.10–0.15/0.15; rl 0.35/0.40; scl 0.45–0.55/0.55.
Holotype, ♂– -21.58536/165.79319, Col d’Amieu 500m (3,0 km to gate), 16.11.2008, leg. M. Wanat (
Paratypes: 1♂–21037.632'S 165045.830'E, Farino env. Les Grandes Fougéres, rainforest, netting, biting, 12.03.2008 467m, leg. R. Dobosz & T. Blaik; 5915/11630 (BMNH); 1♂,1♀–21.61176/165.75406, Farino, Parc des Grandes Fougéres, 400m Camp de la Houe, 13.11.2008, leg. M. Wanat (MNHW); 1♀–21035.1'S 16504’, Col d’Amieu 490m (3,5 km from gate), 6–7.01.2007 (loc 3), leg. M. Wanat (MNHW); 1♂–-21.58536/165.79319, Col d’Amieu 500m, (3,0 km to gate), 16.11.2008, leg. M. Wanat (MNHW); 1♀–Col d’Amieu, Forestry Station, 18–21 Oct 1978, J.S. Dougdale; malaise trap; N.Z. Arthropod Collection
A toponymical adjective, after Tchamba, where some of the paratypes were collected.
New Caledonia (main island, north and south provinces).
Distinguished by the bicolored body with pronotum and basal part of elytra reddish and remaining parts of body black. Pronotal disc with subtriangular mark composed of white scales. Humeral calli strongly prominent.
Body length (lb) 2.55–2.90 mm.
Body colour and vestiture (Fig.
Head, rostrum and antennae (Figs
Pronotum (Figs
Elytra (Figs
Legs (Figs
Abdomen (Fig.
Male terminalia (Figs
Female (Figs
Holotype, ♂/paratype, ♀: apw 0.50/0.55; arw 0.25/0.30; bew 1.15/1.35; bpw 0.65/0.75; el 1.75/2.00; eyl 0.25/0.30; frw 0.15/0.15; hl 0.35/0.40; hw 0.25/0.30; lb 2.55/2.90; mew 1.15/1.35; mith 0.20/0.25; mpw 0.65/0.75; mth 0.30/0.35; pl 0.55/0.60; ptbl 0.60/0.70; ptbmw 0.15/0.15; rl 0.40/0.45; scl 0.55/0.55.
Holotype, ♂–20°33'S/164°48'E, 20-50 m., Cascade de Tao, humid forest along stream, 01.02. 2004, leg. M. Wanat (
Paratypes: 1♀– 20°23.9'S/164°31.9'E, Mandjélia (summit), 12.01.2007, 750-780 m, beating, montane forest, leg. M. Wanat & R. Dobosz (MNHW); 1♀– 20°33'S/164°46'E, Mt. Panié, 500–1000 m, E track, humid forest, 03.02.2004, leg. M. Wanat (MNHW).
This specific epithet is derived from the Latin prefix bi– (two), and noun color (color, pigment) and refers to the bicolored body. A noun in apposition.
New Caledonia (main island, north province).
The species can be distinguished from other species by the following combination of features: rostrum short and wide; eyes strongly convex laterally; lateral line of temples longer than length of eyes, distinctly divergent. Last abdominal ventrite apically with two shallow grooves bearing elongate setae. Parameroid lobes of tegmen separate to base. Internal sac of aedeagus with two, elongate, sclerites. Most similar to R. longulus sp. n. but can be easily distinguished by toothed tarsal claw (unarmed in R. longulus sp. n.), stronger convex eyes–hw/hl = 1.00 (R. longulus sp. n.–hw/hl = ca. 1.20) and shorter rostrum–rl/arw = 1.50 (R. longulus sp. n.–rl/arw = 1.70).
Body length (lb)ca. 3.20 mm.
Body colour and vestiture (Fig.
Head, rostrum and antennae (Figs
Pronotum (Figs
Elytra (Figs
Legs (Figs
Abdomen (Fig.
Male terminalia (Figs
Female. Unknown
Holotype, ♂: apw 0.60; arw 0.30; bew 1.30; bpw 0.75; el 2.15; eyl 0.25; frw 0.20; hl 0.55; hw 0.55; lb 3.20; mew 1.35; mith 0.25; mpw 0.80; mth 0.50; pl 0.65; ptbl 0.80; ptbmw 0.15; rl 0.45; scl 0.60.
Holotype, ♂– 22°11.0'S/165°17.6'E, Auopinié, 850–900 m., 18.01.2007, forest, leg. M. Wanat & R. Dobosz (
From the Latin prefix bi– (two), and noun furca (fork, two-pronged), refers to the two characteristic, elongate sclerites in the internal sac of aedeagus. An adjective.
New Caledonia (main island, north province).
It differs from other members of the new genus in having two characteristic spots in the middle of elytra. Body elongate; head behind eyes wide and stout with parallel lateral margin of vertex, eyes hardly concave; claws strongly curved with prominent, acute basal tooth.
Body length (lb)ca. 3.30 mm.
Body colour and vestiture (Fig.
Head, rostrum and antennae (Figs
Pronotum (Figs
Elytra (Figs
Legs (Figs
Abdomen (Fig.
Male terminalia (Figs
Female. Unknown
Holotype, ♂: apw 0.60; arw 0.35; bew 1.35; bpw 0.85; el 2.30; eyl 0.25; frw 0.20; hl 0.50; hw 0.55; lb 3.35; mew 1.35; mith 0.25; mpw 0.80; mth 0.45; pl 0.70; ptbl 0.75; ptbmw 0.15; rl 0.45; scl 0.60.
Holotype, ♂– No. 1194, 22°24.0'S × 164°31'E, 580 m., Mandjelia, lower creek, 12–13 Dec 2004, rainforest, leg. G.B. Monteith, beating (
From the Latin prefix bi– (two), and noun macula (spot), refers to the two characteristic spots in the middle of the elytra. An adjective.
New Caledonia (main island, north province).
This species is unique among members of the genus in having a blunt, large tooth on the basal part of the tarsal claws. Forehead and basal part of rostrum with suboval, white scales. Elytral striae composed of irregular punctures, from third striae outwards punctures fused into irregular line. Apical part of suture with stripe composed of fine, pale scales.
Body length (lb)ca. 2.60 mm.
Body colour and vestiture (Fig.
Head, rostrum and antennae (Figs
Pronotum (Figs
Elytra (Figs
Legs (Figs
Abdomen (Fig.
Female terminalia (Figs
Male. Unknown.
Holotype, ♀: apw 0.50; arw 0.25; bew 1.05; bpw 0.60; el 1.75; eyl 0.25; frw 0.15; hl 0.30; hw 0.45; lb 2.60; mew 1.05; mith 0.20; mpw 0.60; mth 0.25; pl 0.55; ptbl 0.60; ptbmw 0.10; rl 0.40; scl 0.45.
Holotype, ♀– 22°11'S/165°17'E, Aoupinie, 900–950 m., gate–meteo st., 8.02.2004, leg. M. Wanat (
The specific epithet derived from the Latin adjective grandis (big, large) and the noun dens (a tooth) and refers to the distinctly toothed claws. A noun in apposition.
New Caledonia (main island, north province).
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.
Body length (lb)ca. 3.50 mm.
Body colour and vestiture (Fig.
Head, rostrum and antennae (Figs
Pronotum (Figs
Elytra (Figs
Legs (Figs
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
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.
Holotype, ♀– 21°11'S/165°17'E, Aoupinie, 850–900 m., 18.01.2007, forest, leg. M. Wanat & R. Dobosz (
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 (
The specific epithet is derived from the Latin adjective longus (long) and diminutive ending –ulus and refers to the elongate rostrum.
New Caledonia (main island, north and south provinces).
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.
Body length (lb)ca. 3.60 mm.
Body colour and vestiture (Fig.
Head, rostrum and antennae (Figs
Pronotum (Figs
Elytra (Figs
Legs (Figs
Abdomen (Fig.
Male terminalia (Figs
Female. Unknown.
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.
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 (
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.
New Caledonia (Lifou Island).
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.
Body length (lb) 3.20–3.60 mm.
Body colour and vestiture (Fig.
Head, rostrum and antennae (Figs
Pronotum (Figs
Elytra (Figs
Legs (Figs
Abdomen (Figs
Male terminalia (Figs
Female (Figs
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.
Holotype, ♂– 21°11.0'S 165°17.6'E; Aoupinié, 700–900 m.; 18.01.2007, forest; leg. R. Dobosz & M. Wanat (
Paratypes: 1♀–No. 11975; 20°58'S×165°17'E, 480m.; Pic d’Amoa, north slope; 3 Jan 2005, rainforest; G. Monteith, beating (
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.
New Caledonia (main island, north province).
The following combination of characters allows this species to be distinguished from its congeners: head capsule almost quadrate; rostrum small, shorter than head capsule; elytra with stripe composed of pale scales at apical part of suture; tegmen with membranous parameroid lobes and dorsal part of tegminal ring bearing a pair of short, broadly rounded sclerotised lobes; aedeagus with complex transfer apparatus in endophallus; male pygidium with enlarged ventral lobes, occupying almost half area of inner part of pygidium.
Body length (lb)ca. 3.00 mm.
Body colour and vestiture (Fig.
Head, rostrum and antennae (Figs
Pronotum (Figs
Elytra (Figs
Legs (Figs
Abdomen (Fig.
Male terminalia (Figs
Female. Unknown.
Holotype, male: apw 0.55; arw 0.25; bew 1.30; bpw 0.75; el 2.00; eyl 0.30; frw 0.15; hl 0.45; hw 0.50; lb 3.00; mew 1.30; mith 0.20; mpw 0.75; mth 0.50; pl 0.55; ptbl 0.70; ptbmw 0.15; rl 0.40; scl 0.50.
Holotype, ♂– -22.03188/166.46738, Dzumac Mts 900m, Mt Ouin road junction, night beating, 29.10.2008, leg. M. Wanat (
The specific epithet is the Latin adjective virgatus (striped) and refers to the stripe of pale scales at the apical part of the suture.
New Caledonia (main island, south province).
The known species of the new genus Rasilinus can be separated as follows:
1 | Body bicoloured, apical part of elytra, legs and head dark brown to black; base of elytra and pronotum reddish (Fig. |
R. bicolor |
– | Elytra and pronotum uniformly brown to almost black (Figs |
2 |
2 | Elytra with pair of white spots medially (Figs |
R. bimaculatus |
– | Elytra without any spots | 3 |
3 | Apical part of elytral suture with a stripe composed of fine, white scales differing from those on elytral disc (Figs |
4 |
– | Apical part of elytral suture without distinctive scales forming a stripe | 5 |
4 | Elytra ca. 1.70 × as long as wide; tarsal claws strongly curved with broadened, stout, basal tooth (Fig. |
R. grandidens |
– | Elytra ca. 1.50 × as long as wide; tarsal claws weakly curved, distinctly broadened near base, without tooth (Fig. |
R. virgatus |
5 | Ventral margin of front femora with tooth | 6 |
– | Ventral margin of front femora unarmed | 8 |
6 | Rostrum elongate (rl/arwca. 1.85); median keel on rostrum present (Fig. |
R. subgemellus |
– | Rostrum shorter (rl/arw = 1.20–1.60); median keel on rostrum absent (Figs |
7 |
7 | Larger species (lb = 3,25–3.60); pronotum subquadrate (mpw/pl = 1.00 –1.07); first abdominal ventrite of male with a large median tubercle (Fig. |
R. subnodulus |
– | Smaller species (lb = 2.45–2.90); pronotum transverse (mpw/pl = 1.15–1.27); first abdominal ventrite of male without median tubercle | R. tchambicus |
8 | Middle femora with small tooth (Fig. |
R. bifurcatus |
– | Middle femora unarmed (Fig. |
R. longulus |
The new genus Rasilinus is superficially similar to the genus Koghicola Mazur, 2014 but can be easily distinguished by the absence of the prominent processes at the apex of the elytra and normal (not enlarged) trochanters (see Fig.
Most known species from the tribe Eugnomini that have been described so far come from New Zealand. From New Caledonia only two genera have been known for many years–the monotypic genus Callistomorphus Perroud, 1865 and three species from the genus Pactola Pascoe, 1876 (describe at the time as Macropoda Montrouzier, 1861, see
Fauna of New Caledonian Eugnomini have not been investigated in greater detail so far. Until now three more species of Pactola and one monotypic genus Koghicola Mazur, 2014b have been described (
A wide distribution of the tribe (from South America to Australian region) with many endemic genera and extremely intra- and interspecies variability causes many problems with redefinition of the tribe. Furthermore, many genera have not been described so far, so phylogeny, zoogeography and origin of the tribe still require further research.
I would like to thank Geoff Monteith (