Cybister laevis Falkenström, 1936

Jiang, Zhuo-Yin, Zhao, Shuang, Mai, Zu-Qi, Jia, Feng-Long & Hendrich, Lars, 2023, Review of the genus Cybister in China, with description of a new species from Guangdong (Coleoptera: Dytiscidae), Acta Entomologica Musei Nationalis Pragae 63 (1), pp. 75-102 : 80

Cybister laevis Falkenström, 1936

( Figs 5A–C ; 20A )

Cybister laevis Falkenström, 1936: 243 (orig. descr.).

Cybister tripunctatus var. laevis: GSCHWENDTNER (1938: 64) .

Type material. HOLOTYPE: ♀ ( NHRS), labelled: “Giufu-Shan [ Chongqing, Jinfoshan Mt. ] / Szechuan / Em. Reitter [p] // Cybister ♀ / laevis / Falk. [hw] / det. Falkenström [p] // Typus [red label with black frame, p] // 7533 / E91 + [blue label, p] // NHRS-JLKB / 000073974 [p]”.

Diagnosis. See Cybister tripunctatus lateralis . Ventral side yellowish.

Comments to classification. The female type specimen has smooth elytra without any striolae – a condition which can be observed also in all females of C. tripuncatus lateralis . Since it is an odd, old museum specimen, it has a yellowish ventral side, which is not the case for C. tripunctatus lateralis from China, where the ventral side is always black or ferruginous in freshly hatched specimens. The size ( 26 mm) and the coloration of the dorsal side also indicate that C. laevis is conspecific with the variable and widespread C. tripunctatus lateralis , as already suggested by GSCHWENDTNER (1938).

Distribution. China ( Chongqing) ( Fig. 20A ).

Figures

Fig. 5. Cybister laevis Falkenström, 1936 (holotype ♀). A – habitus in dorsal view; B – habitus in ventral view; C – labels. Scale bar: 5.0 mm.

Fig. 20. Map of distribution of Cybister in China.