The genus Laccobius in China: new species and new records (Coleoptera: Hydrophilidae)

Abstract

The species of the water scavenger beetle genus Laccobius Erichson, 1837 occuring in China are reviewed. Two new species are described: Laccobius (Glyptolaccobius) qinlingensis sp. nov. (Shaanxi) and L. (Cyclolaccobius) hainanensis sp. nov. (Hainan). Five species are recorded for the first time: Laccobius (Dimorpholaccobius) bipunctatus (Fabricius, 1775), L. (D.) striatulus (Fabricius, 1801) and L. (Compsolaccobius) pallidissimus Reitter, 1899 (all from Xinjiang), L. (Microlaccobius) tonkinensis Gentili, 1979 (Shaanxi), and L. (Compsolaccobius) decorus (Gyllenhal, 1827) (Qinghai). Additional faunistic data from China are provided for the following species: L. (Cyclolaccobius) hingstoni Orchymont, 1926, L. (C.) nitidus Gentili, 1984, L. (C.) politus Gentili, 1979, L. (C.) yunnanensis Gentili, 2003, L. (Dimorpholaccobius) simulans Orchymont, 1923, L. (s.str.) binotatus Orchymont, 1934, L. (s.str.) cinereus Motschulsky, 1860, L. (s.str.) colon (Stephens, 1829), L. (s.str.) inopinus Gentili, 1980, L. (s.str.) minutus (Linnaeus, 1758), L. (s.str.) nobilis Gentili, 1979, L. (Microlaccobius) elegans Gentili, 1979, L. (M.) florens Gentili, 1979, L. (M.) formosus Gentili, 1979, L. (M.) hammondi Gentili, 1984, L. (M.) himalayanus Gentili, 1988, and L. (M.) nepalensis Gentili, 1982. An updated checklist of Laccobius species occurring inChina is provided.

Molecular phylogeny, evolution and classification of the Hydrophilidae (Coleoptera)

“…The genus Laccobius, the largest in the tribe with more than 250 species, occurs primarily in streams but occasionally in hygropetric habitats (in Southeast Asia only) and rarely in lentic situations (e.g. Perkins, 1976, Boukal et al, 2007Jia et al, 2013; Fikáček, personal observation). The genera Arabhydrus, Hydrophilomima, and Pelthydrus are likewise predominantly stream inhabitants (Hansen & Schödl, 1997;Fikáček et al, 2010;M.…”

A new species of Laccobius Erichson, 1837 (Hydrophilidae, Coleoptera) from the Chinese Himalaya, with comments on taxonomic status of subgenera Glyptolaccobius Gentili, 1989 and Cyclolaccobius Gentili, 1991 and additional faunistic records from China

“…Since the species of the genus Laccobius Erichson, 1837 occurring in China and neighboring areas were reviewed by Gentili (1995, 2003) and Jia et al (2013a), and only three species of this genus were described from this region more recently (Jia et al 2013b; Gentili 2015; Zhang and Jia 2017). The fauna of the eastern Himalayas and neighboring mountain systems have not yet been investigated properly and the discovery of additional species is expected.…”

A new species of Laccobius Erichson, 1837 from China <br />(Coleoptera: Hydrophilidae)

“…The subgenus Cyclolaccobius Gentili of the genus Laccobius Erichson, 1837 was erected by Gentili (1991) and originally included 17 species. Since then, 15 new species have been described from the Oriental, Afrotropical and Palearctic regions (Gentili 1995, 1996, 1997, 2003, 2012, Hebauer & Wang 1998, Kamite et al 2007, Short & Hebauer 2006, Short & Fikáček 2011, Jia et al 2013. Three species, assigned previously to the subgenus Glyptolaccobius, 1989, by Gentili & Fikáček (2009), were also recently transferred to the subgenus Cyclolaccobius by Fikáček (2011) andGentili (2012).…”

“…Three species, assigned previously to the subgenus Glyptolaccobius, 1989, by Gentili & Fikáček (2009), were also recently transferred to the subgenus Cyclolaccobius by Fikáček (2011) andGentili (2012). Currently, a total of 35 species of Laccobius (Cyclolaccobius) are known of which 26 species occur in the Oriental region, five in the Afrotropical region, two in the Palearctic region (Pakistan and Honshu, Japan), and three in the border area between the Oriental and Palearctic regions (L. zugmayeri Kniz, 1910 and L. hingstoni d'Orchymont, 1926 occurring in the Himalaya and Tibetan Plateau, and L. nitidus Gentili, 1984 occurring in southern China) (Hansen 1999, Jia et al 2013.…”