Enochrus (Hydatotrephis) liangi Jia & Zhao, 2007

Jia, Fenglong & Lin, Renchao, 2015, Additions to the review of Chinese Enochrus, with description of a new species (Coleoptera, Hydrophilidae, Enochrinae), ZooKeys 480, pp. 49-57 : 50

Taxon classification Animalia Coleoptera Hydrophilidae

Enochrus (Hydatotrephis) liangi Jia & Zhao, 2007 Figs 1, 2, 6-11, 18

Enochrus (Hydatotrephis) liangi Jia and Zhao 2007: 252.

Type material.

Holotype: female (SYSU): CHINA: Guizhou: Leishan County: Fangxiang: female, 14. ix. 2005, Coll. Shuang Zhao.

Additional material examined.

18 males and 14 females (NMPC, SYSU): China, Jiangxi Province, Jing’an county, Daqishan forest farm, ca. 28.67°N, 115.07°E, 350 m a.s.l., in a natural pool, 18.vii.2014, Renchao Lin leg [with Chinese and English labels]; 1 female (SYSU): China, Sichuan Province, Leshan, Emeishan, Qingyinge, 29°34'N, 103°07'E, 750 m, 7.vi.2014, Renchao Lin lgt.

Diagnosis.

Head with large preocular spots, reaching frontoclypeal suture posteriorly and reaching inner margin of eyes inwards (Fig. 9), sometimes each preocular spot separated into two spots by a black patch (Fig. 7), or preocular spots connected medially (Fig. 8). Elytron black with posterior half yellow, and yellow colour extends anteriorly as broad band along the lateral margin (Figs 1, 10). Maxillary palps yellow, not dark apically, subequal to the width of head anterior to eyes (Fig. 6). Elytron with a short series of punctures in front of sutural stria, which are same size as other serial punctures (Fig. 10). Fifth abdominal ventrite with apical emargination fringed with stiff yellowish setae (Fig. 11). Aedeagus similar to Enochrus (Methydrus) japonicus (Sharp, 1873) (Fig. 19), with parameres curved outwards apically, median lobe narrow with sharp apex (Fig. 18). The colour is very similar to Enochrus (Holcophilydrus) laoticus Hebauer, 2005 and the latter also with parameres curved outwards subapically. However, Enochrus laoticus Hebauer with 10 elytral series of punctures; mesosternal process conical, not depressed laterally; median lobe of aedeagus broader and with small emargination apically, as long as parameres.

Description of male.

External morphology identical with female. Male genitalia: phallobase slightly longer than parameres. Parameres broad, longer than median lobe, obliquely truncated inwards and strongly bent outwards apically. Median lobe narrower than parameres, gradually narrowed from base to apex, sharp apically (Fig. 18).

Distribution.

China (Guizhou, Sichuan, Jiangxi). New for Sichuan and Jiangxi.

Habitat.

The series from Jiangxi was collected at margin of natural pools with mud sediment and sparse grass. Lots of Enochrus japonicus (Sharp) were also collected in the same pool.