Review of the Asian Thaumastodinae (Coleoptera, Byrrhoidea, Limnichidae), with a phylogeny of the genera Author Yoshitomi, Hiroyuki text European Journal of Taxonomy 2019 2019-09-04 583 1 45 journal article 24720 10.5852/ejt.2019.583 104a1ea7-b7d6-45cd-9402-bc84ab16b143 3564532 4F834ADD-57E7-4CE3-B16A-127F1BE4AE14 Acontosceles borneensis sp. nov. urn:lsid:zoobank.org:act: 2582 F411-8790-4937-B6A0-248899FD9208 Figs 5A , 6 Etymology This species is named after its type locality. Material examined Holotype MALAYSIA • ♂ ; “SARAWAK: Nanga Pelagus 7-14. VIII. ‘58”; “ T. C. Maa Collector BISHOP”; BPBM . Paratypes MALAYSIA • 1 ♂ , 2 ♀♀ ; same collection data as for holotype ; BPBM • 1 ♀ ; same collection data as for preceding; EUMJ • 2 ♀♀ ; “BORNEO: SARAWAK Merirai Valley nr Kapit , 30-300m , 1-6. VII. 58 ”; “ T. C. Maa Collector BISHOP Mus.”; BPBM • 1 ♀ ; “BORNEO: SARAWAK Bau , Lake Area 29-30. VIII. 1958 ”; “ T. C. Maa Collector BISHOP”; BPBM . Description Male BODY. Oblong, subparallel-sided, slightly convex dorsally, weakly shiny, closely covered with suberect silver setae. Coloration of body blackish brown, but mouthparts and legs yellowish brown; elytra with obscure silver spots consisting of erect setae. HEAD. Moderate in size; frons and clypeus closely covered with erect, long silver setae; clypeus with straight anterior margin. Eyes large, prominent dorso-laterally. ANTENNAE. Reaching about proximal half of pronotum. PRONOTUM. Widest at basal third, densely bearing short yellowish setae and minute scale-like setae; PW/ PL 2.25–2.50 (2.34). Scutellum small, subtriangular. ELYTRA. Oblong, subparallel-sided near base to apical fifth, densely covered with short yellowish setae and minute scale-like setae, projecting ventrally in apical part; EL/ EW 1.59–1.80 (1.72); EL/ PL 4.17– 4.63 (4.39); EW/ PW 1.02–1.16 (1.10); TL/ EW 1.97–2.22 (2.11). ABDOMEN. Sternite VII ( Fig. 6A ) broad, gently arcuate along caudal margin, shallowly concave in median part, bearing about 20 long setae and three pairs of long and stout setae. Sternite VIII ( Fig. 6B ) membranous, bearing minute spines in apical parts. Sternite IX ( Fig. 6C ) moderately sclerotized, large, with small apical plates. AEDEAGUS ( Fig. 6 D–E). Long, well sclerotized, strongly curved ventrally; basal piece oblong, expanded basally, evenly curved ventrally; lateral lobes long and slender, serrate on dorso-lateral margins, curved ventrally; median lobe long and slender, about 0.6 times as long as lateral lobe, gently curved ventrally; ML/BL 0.36; ML/ LL 0.68. Female Sexual dimorphism distinct in the following characteristics: 1) frons and clypeus covered with short yellowish setae; 2) apical part of elytra projecting ventro-apically; 3) sternite VII ( Fig. 6F ) rather pointed on caudal margin, bearing about 40 long setae. Urosternite ( Fig. 6G ) well sclerotized, with long and slender apodeme; lateral projections stout, bifid in apical parts. Ovipositor ( Fig. 6H ) well sclerotized; coxite sparsely punctuate, pointed at apices; approximate ratio of coxite and baculus (n = 1) of 1.0:1.7. Measurements Unsexed (n = 4): TL 2.17–2.25 (2.21) mm; PW 0.90–1.00 (0.96) mm; PL 0.40–0.42 (0.41) mm; EL 1.75–1.85 (1.80) mm; EW 1.00–1.10 (1.05) mm. Distribution Malaysia ( Sarawak ). Remarks This species belongs to the hydroporoides species group judging from characteristics of the male genitalia.