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.