Ctenoplus neosiamensis, Fuller & Platia, 2006

Fuller, E. & Platia, G., 2006, A revision of the click beetle genus Ctenoplus Candèze, 1863 (Coleoptera: Elateridae, Synaptina), Zootaxa 1217 (1), pp. 1-76 : 43-44

Ctenoplus neosiamensis n. sp.

Figures 21 , 73 , 95 , 109 , 115

Diagnosis

Small, black and red Ctenoplus ( Fig. 115 ) with rounded apices of the elytra and serrate intermediate antennomeres. This species in similar to C. siamensis n. sp. but can be distinguished by the colour of the antennae, the shape of antennomeres 5–8 and the male genitalia. In C. neosiamensis , the basal three antennomeres are yellowish­red and the remaining antennomeres are black, antennomeres 5–8 are slightly longer than distal width ( Fig. 21 ) and the lateral margins of the parameres are concave ( Fig. 73 ). In C. siamensis , all antennomeres are brownish­yellow to brown, intermediate antennomeres are about 1.5–2X as long as distal width ( Fig. 22 ), and the lateral margins of the parameres are straight ( Fig. 74 ). These two species are sympatric.

Description

Generally as in C. collaris except as noted below.

Head and elytra black; pronotum, hypomeron, prosternum between anterior lobe and posterior margin of procoxal cavities red; abdomen, venter of meso­ and metathorax, and rest of prothorax reddish black; basal 2 or 3 (asymmetrical) antennal segments and legs yellowish red; setae yellowish to brownish­black on body, brown on elytra, lateral pronotal setae bright yellow, discal pronotal setae brown to brownish­black on most specimens. Length: 6.0– 7.5 mm; width: 1.5–2.0 mm.

Head. Eyes relatively small: ocular index, male 72–83, female 76–78. Antenna, Fig. 21 ; male antennomeres 4–11 with fine, moderately long, erect setae along anterior margin.

Prothorax. Prosternum: punctures somewhat larger than in C. collaris ; prosternal spine: ventral surface narrowed posterad procoxae, thus ventral surface narrower than dorsal surface in ventral aspect, ventrolateral carinae not extended anterad procoxal cavities, more convergent posterad procoxae, remaining separate almost to ventral apex.

Mesothorax. Scutellum flat. Mesepisternum glabrous except along anterior margin. Elytra: shape of posterior 1/2 as in C. siamensis (c.f. Fig. 63 ) except apex with small sutural tooth, apices slightly dehiscent; interval punctures larger, subequal in size to midline pronotal punctures, separated by 1.5–2X own diameters.

Metathorax. Metasternum lacking lateral submarginal groove; punctures along midline about 1/2 size of lateral punctures, simple, separated by about own diameters.

Abdomen. Male genitalia, Fig. 73 . Female genitalia, Fig. 95 ; spermatophore present in bursa and most of tubular extension in specimen illustrated; bursal plates attenuated posteriorly along ventral surface of bursa; free spines of bursa enclosing base of tubular extension; tubular extension: relatively long, bearing single band of spines, basal spines same length and thickness as free spines on bursa, grading into short, thorn­like spines with wide conical bases distally; sac­like spermatheca present.

Material examined and range

13♂, 2♀. [ THAILAND:] Holotype male: “NW THAILAND, 19.19N 97.59E, Mae Hong Son, Ban Huai Po , 1600–2000m, 9– 16.5.1991, L. Dembický leg.” [ NHMW] . Paratypes. 1♂: same locality and elevation as holotype but collected “8– 18.5.1992, J. Horak leg” [ CCW] ; 3♂: same data as holotype but collected by J. Horak [ CCW, CSV, CHP] ; 1♂, “THAILAND bor occ., 30.4– 14.5. 1991, Mae Hong Son env., Ban Huai Po, 1800m, Jan Farkač leg.” [ ERFC] ; 3♂, 1♀: “NW THAILAND Mae Hong Son Prov., BAN HAUI PO 1600m, 15– 19.5.1996, leg Bíly” [ CCW, ERFC] ; 1♂: “Thai 25.5.1991, FANG 300m, 19°55’N 99°12’E, David Král lgt”/ “Thailand ‘91, ‘Ihanon Thong Choi’, D. Král & V. Kuban ” [ CSV] ; 2♂, 1♀: “NE [sic] Thailand , 1– 15.5.1991, Mae Hong Son, Ban Haui Po 800–1600 m, S. Bíly leg” [ CBP, CCW] ; 1♂: “ Thai 18–24.iv.1991, LANSANG n.p. 500m, 16°48’N 98°57’E, David Král lgt.”/ “Thailand ‘91, ‘Ihanon Thong Choi’, D. Král & V. Kuban” [ CSV]. This species has been collected in northwest Thailand ( Fig. 109 ) .

Etymology The species epithet is derived from ‘neo­’ + ‘siamensis’, denoting new siamensis.

Natural history

Specimens have been collected from 18 April to 25 May, and from 300 to 2000 m in elevation.

Figures

FIGURE 109. Distribution of Ctenoplus species.

FIGURES 15–30. Antenna of Ctenoplus species. 15, C. javanensis Cand.; 16, C. sumatrensis n. sp.; 17, C. sanguinolentus (Cand.); 18, C. sanguinolentoides n. sp.; 19, C. nitidipennis Schwarz; 20, C. indicus n. sp.; 21, C. neosiamensis n. sp.; 22, C. siamensis n. sp.; 23, C. rufoantennatus n. sp.; 24, C. castaneus (Fleut.); 25, C. coomani Fleut.; 26, C. divergens n. sp.; 27, C. alutaceus n. sp.; 28, C. semialutaceus n. sp.; 29, C. cateianus n. sp.; 30, C. dorsalis n. sp. Scale bar = 0.5 mm.

FIGURES 66–85. Male genitalia of Ctenoplus species, dorsal aspect unless otherwise specified. 66, C. javanensis Cand.; 67, C. sumatrensis n. sp.; 68, C. sanguinolentoides n. sp.; 69, C. nitidipennis Schwarz; 70, C. indicus n. sp.; 71, C. collaris Cand., a, dorsal, b, ventral; 72, C. pseudocollaris n. sp.; 73, C. neosiamensis n. sp.; 74, C. siamensis n. sp.; 75, C. rufoantennatus n. sp.; 76, C. castaneus (Fleut.), a, dorsal, b, lateral; 77, C. coomani Fleut.; 78, C. divergens n. sp.; 79, C. alutaceus n. sp., a, dorsal, b, lateral; 80, C. semialutaceus n. sp.; 81, C. balli n. sp.; 82, C. girardianus n. sp.; 83, C. gigas n. sp.; 84, C. cateianus n. sp.; 85, C. deceptus n. sp. Abbreviations: st, median struts; pa, parameres; ph, phallobase. Scale bar = 0.25 mm.

FIGURES 89–97. Female genitalia of Ctenoplus species. 89, C. sumatrensis n. sp.; 90, C. sanguinolentus Cand.; 91, C. sanguinolentoides n. sp.; 92, C. nitidipennis Schwarz; 93, C. indicus n. sp.; 94, C. collaris (Cand.); 95, C. neosiamensis n. sp.; 96, C. rufoantennatus n. sp.; 97, C. castaneus (Fleut.). Scale bar = 0.5 mm.

FIGURES 113–116. Ctenoplus species, habitus. 113, C. cateianus, n. sp.; 114, C. gigas n. sp.; 115, C. neosiamensis n. sp.; 116, C. sanguinolentoides n. sp.

FIGURES 60–63. apex of elytra of Ctenoplus species, dorsal. 64, 65: left elytron of Ctenoplus species, dorsal. 60, C. javanensis Cand.; 61, C. sanguinolentoides n. sp.; 62, C. collaris Cand.; 63, C. siamensis n. sp.; 64, C. balli n. sp.; 65, C. girardianus n. sp. Scale bar = 60–63: 0.5 mm; 64, 65: 1 mm.