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nominal species Unio crassus var. okae Kobelt & Haas, 1910

Unio crassus var. okae Kobelt & Haas, 1910 = Unio crassus

(intro'd as intra-sp. of Unio crassus Philipsson in Retzius, 1788)
Kobelt & Haas, 1910. Icon. Land- und Süssw.-Moll. 17: 58, index, pl. 480, fig. 2567.
HOLOTYPE SMF 10971, Oka River, Serpukhov, Russia.

Taxonomic Opinions

+ Unio crassus Philipsson, 1788 — Nagel, 2025: 133, fig. 99.

holotype SMF 10971/1, 1v — Russia, “bei Serpuchon an der Oka” [Serpuchow, 54°55’N 037°25’E; locality assumed to tbe identical to the one mentioned for Unio pictorum okae Kobelt, 1911] (coll. W. Kobelt ex W.A. Lindholm vi.1908)

+ Unio crassus Philipsson in Retzius, 1788 — Lopes-Lima et al., 2024: suppl. append. 2, p. 10.

+ Unio crassus gontieri Bourguignat — Haas, 1969: 53.

+ Unio crassus gontieri Bourguignat, 1856 — Haas, 1940: 131.

= Unio (s.s.) crassus var. okae Kobelt, 1911 — Zhadin, 1938: 89, sp. 3d, fig. 23.