Cryptopleurum coomani d’Orchymont, 1926

Jia, Fenglong & Zhang, Ruijuan, 2017, A review of the genus Cryptopleurum from China (Coleoptera: Hydrophilidae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 57 (2), pp. 577-592 : 583

Cryptopleurum coomani d’Orchymont, 1926

( Figs 17‒23 )

Cryptopleurum Coomani d’Orchymont, 1926: 229 . Cryptopleurum coomani: HANSEN (1999: 309) : catalogue.

Type locality. Vietnam, Tonkin, Lac Tho (near Hoa Binh).

Type material examined. PARATYPE: male ( ISNB): Coll. A. d’Orchym. // LACTHO / Tonkin / de Coomani // A. D’Orchymont det. [handwritten] / Cryptopleurum [handwritten] / Coomani (handwritten)/ Co-type d’Orchym // Coll.A. Knisch / COTYPUS.

Additional material examined. CHINA: GUANGDONG: 1 male and 2 females ( SYSU): China, Guangdong, Gaoming, Yangmei town (transcribed from Chinese), 23.62ºN 113.42ºE, 23‒26.iv.2006, lgt. Fenglong Jia (transcribed from Chinese).

Redescription. Length 1.9–2.0 mm. Pronotum with distinct double-sized punctures, slightly shagreened between punctures ( Fig. 23 ). Elytra with intervals distinctly elevated from base to apex ( Figs 17, 19 ), but distinctly broader than those of C. sulcatum , each elytral interval with dense irregular punctures at least on basal half ( Figs 17, 20 ), seventh and eighth striae very close and in a same groove, interval eight not elevated, punctural striae distinctly narrower than other intervals ( Fig. 20 ). Elevation of metaventrite strongly shagreened between coarse punctures. Aedeagus ( Fig. 21 ). Dorsal view: Paramere ca. 1.4× as long as phallobase, gradually narrowed from base to middle and almost parallel from base to subapex, apex narrowly rounded and curved inwards subapically, with membrane inwards subapically; median lobe ca. 10× as long as width at midlength, distinctly narrowed about apical third, ca. as wide as paramere apically.

Differential diagnosis. This species is similar to C. sulcatum , but can be easily distinguished from the later by each elytral interval having dense irregular punctures at least on the basal half ( Fig. 20 ), the punctural striae are distinctly narrower than the intervals ( Fig. 20 ), and elytral intervals are highly convex but not costate.

Biology. Chinese specimens were collected in excrements of cattle that is not too fresh, but is wet enough.

Distribution. Previously only known from Vietnam. First record for China (Guangdong).

Figures

Figs 17–23. Cryptopleurum coomani d’Orchymont, 1926. 17–19 – habitus (17 – dorsal; 18 – ventral; 19 – lateral view). 20 – dorsolateral part of right elytron (A – seventh stria; B – eighth stria). 21 – aedeagus (dorsal, lateral and ventral view). 22 – meso- and metaventrite. 23 – pronotal punctation.