Taxonomic revision of the genus Elmomorphus Sharp, 1888. II. Redescription of the genus and review of the species from India, Nepal, Bhutan, Myanmar, China, Thailand, Laos, Cambodia, and Vietnam (Coleoptera: Dryopidae) Author Selnekovič, Dávid D930D757-D929-4248-A29C-A857E0505345 Department of Zoology, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovičova 6, SK- 842 15 Bratislava, Slovakia. david.selnekovic@uniba.sk Author Jäch, Manfred A. D749707A-8823-4110-8D51-BF5AF4E2820F Naturhistorisches Museum Wien, Burgring 7, A- 1010 Wien, Austria. manfred.jaech@nhm-wien.ac.at Author Kodada, Ján 6E88BFBB-8769-44EC-8285-29E357CEC064 Department of Zoology, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovičova 6, SK- 842 15 Bratislava, Slovakia. jan.kodada@uniba.sk text European Journal of Taxonomy 2024 2024-09-11 957 1 229 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2651/12247 journal article 10.5852/ejt.2024.957.2651 2118-9773 13773385 9957F2DF-3F31-4B58-84BC-2F8E0F45C6E3 Elmomorphus hongkong sp. nov. urn:lsid:zoobank.org:act: FBC10F6F-B308-4370-BA0E-77D64EAF03FA Figs 25–26 , 109D Differential diagnosis Elmomorphus hongkong sp. nov. ( Fig. 25 ) is characterised by the presence of plastron on the cranial surface (except for the semicircular area on the vertex), on the anterior angles of the pronotum, and on the lateral sides of the elytra. The body is small and broadly oval, and the elytron has nine longitudinal rows of large punctures and small punctures scattered on the interstices. This combination of characters is also shared by E. sulcatus sp. nov. and E. depressus sp. nov. , from which it differs in the shallow elytral striae. In E. hongkong , the plastron bands on the anterior elytral two-thirds are narrow, reaching only the eighth elytral row. The plastron bands in E. sulcatus and E. depressus are wider, reaching the sixth elytral row. The prosternal process has a slightly arched median keel, in contrast to E. depressus , which possesses a transverse depression posteriorly. The ventrites are covered with plastron, except for the median portion of the first ventrite, while in E. sulcatus , the plastron is missing on the median portions of the first two ventrites. The phallobase in E. hongkong is shorter (PhL/PrL: 1.93–2.02 (n=3)) than in E. sulcatus (PhL/ PrL: 1.40–2.00 (1.80 ±0.17, n=10)), and the parameres are different as well (see Fig. 26 ). Etymology The epithet is a noun in the nominative singular, standing in apposition to the generic name and refers to the type locality. Type material Holotype CHINA – Hong Kong • ♂ ; “HONGKONG (5) [CWBS 6] 1992 N.T.-Lam Tsuen Riv. 25.VI. leg. Jäch ”; NMW . Fig. 25. Elmomorphus hongkong sp. nov. , paratype, male from type locality (NMW), TL: 2.48 mm. Fig. 26. Elmomorphus hongkong sp. nov. , holotype (NMW), aedeagus. A . Lateral aspect. B . Ventral aspect. Scale bar: 0.1 mm. Paratypes CHINA – Hong Kong • 1 ♂ , 1 ♀ ; same collection data as for holotype; NMW • 1 ♂ ; “ HONGKONG (4) [CWBS 5] 1992 N.T.-Lam Tsuen Riv. 25.VI. leg. Jäch ”; NMW • 3 ♀♀ ; “ HONGKONG Tai Po Kau [ Nature Reserve ] 9.3.1978 , leg. Dudgeon (K)”; CKB , NMW . Type locality China , Hong Kong Special Administrative Region , New Territories, Tai Mo Shan Country Park, Lam Tsuen River, southwest of Tai Po New Town; ca 150–500 m a.s.l. ( CWBS 6; Jäch & Ji 1995 : fig. 8). Description Measurements (mm): TL: ♂♂ 2.31–2.55 (n=3), ♀♀ 2.53–2.94 (2.71 ±0.17, n =4); PL: ♂♂ 0.60–0.65 (n=3), ♀♀ 0.63–0.75 (0.69 ±0.05, n= 4); PW: ♂♂ 1.17–1.33 (n=3), ♀♀ 1.25–1.45 (1.35 ±0.08, n =4); EL: ♂♂ 1.71–1.89 (n =3), ♀♀ 1.89–2.19 (2.03± 0.12, n= 4); EW: ♂♂ 1.39–1.54 (n =3), ♀♀ 1.48–1.67 (1.56 ± 0.08, n=4); PhL: 0.46–0.51 (n=3); PrL: 0.24–0.25 (n =3). Body oval, moderately convex dorsally ( Fig. 25 ). Integument black; mouthparts, antennae and legs reddish brown. Pubescence consists of short sparse yellowish setae. Plastron on cranium except for triangular area on vertex, anterior angles of pronotum, narrow lateral portions of elytra, and on ventral surface except prosternal process, and median parts of metaventrite and ventrite 1. Dorsal head surface with round punctures, each slightly smaller than eye facet, separated by approximately one puncture diameter; plastron on entire surface except for triangular area on vertex. Labrum transverse, anterior margin broadly emarginate, exposed portion microreticulate, with small setiferous punctures; setae equal in length in both sexes. Anterior margin of clypeus straight. Eyes oval, interfacetal setae short; ID: ♂♂ 0.43–0.46 mm (n =3), ♀♀ 0.46–0.50 mm (0.48± 0.01, n=4); APD/ID: ♂♂ 1.64–1.73 (n=3), ♀♀ 1.62–1.75 (1.67± 0.05, n=4). Antennae 10-segmented, densely setose. Pronotum transverse, PW/PL: ♂♂ 1.94–2.05 (n =3), ♀♀ 1.93–2.00 (1.97± 0.03, n=4), rim of anterior margin as wide as an eye facet, interrupted in the middle; anterior angles deflexed, prominent; lateral pronotal sides convergent, moderately rounded; surface smooth, with round punctures; plastron present anterolaterally. Prosternal process wider than long, without groups of long setae in males; lateral edges divergent, straight; posterior edge rounded; lateral portions moderately raised; median keel rather flat. Scutellum wider than long, smooth, with round punctures, acute at apex. Glabrous area of metaventrite widening posteriorly; groups of long setae absent in both sexes; lateral margin of metaventral process raised and separated by shallow groove. Elytra broadly oval, moderately convex, widest close before middle, EL/EW: ♂♂ 1.22–1.23 (n=3), ♀♀ 1.27–1.32 (1.30± 0.03, n=4); surface weakly microreticulate, with small scattered punctures and with large deep punctures arranged in indistinct longitudinal rows, striae shallow; plastron confined to a very narrow lateral band almost reaching elytral base, expanding in apical quarter. Tibiae slightly curved; protibia ca 1.4 × as long as protarsus, PrTL/PL: ♂♂ 0.97–1.06 (n=3), ♀♀ 0.94–1.03 (0.98± 0.05, n=4). Terminal protarsomere about as long as all preceding segments combined. Ventrites covered with plastron except middle of ventrite 1. Ventrite 5 in females with minute apical excision. Aedeagus ( Fig. 26 ): phallobase rather robust, PhL/PrL: 1.93–2.02 (n =3); parameres expanded basally, moderately curved ventrad, apices rounded (lateral aspect); penis rounded apically; sclerotised fibula distinct. Secondary sexual dimorphism Ventrite 5 in females with minute apical excision. Distribution China ( Hong Kong ) ( Fig. 109D ).