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nominal species Unio pseudolitoralis Clessin, 1877

Unio pseudolitoralis Clessin, 1877 = Unio crassus

Clessin, 1875. Verh. Ver. Naturgesch. Hamburg 2: 258 [as ‘pseudo-litoralis’]. [nomen nudum]
Clessin, 1877. Deutsche Excurs. Moll. Fauna: 469, text fig. 305 [as ‘pseudo-litoralis’].

Taxonomic Opinions

+ Unio crassus Philipsson in Retzius, 1788 — Lopes-Lima et al., 2024: suppl. append. 2, p. 4.

+ Unio (Crassiana) crassus Retzius, 1788 — Vinarski & Kantor, 2016: 25.

+ Crassiana crassa crassa (Philippson in Retzius, 1788) — Kantor et al., 2010: 259.

+ Crassiana crassa crassa (Philipsson in Retzius, 1788) — Kantor & Sysoev, 2005: 329.

+ Batavusiana (Crassunio) crassa (Phillipsson, 1788) — Zatravkin, 1987: 52.

+ Batavusiana (Crassunio) crassa (Philippson, 1788) — Stadnichenko, 1984: 68.

+ Unio crassus crassus Retzius — Haas, 1969: 45.

= Unio crassus var. pseudolitoralis Clessin, 1875 — Zhadin, 1965: 243, fig. 258.

+ Unio crassus crassus Retzius, 1788 — Haas, 1940: 129.

= Unio (s.s.) crassus var. pseudolitoralis Clessin, 1875 — Zhadin, 1938: 88, sp. 3a, fig. 22.

= Unio pseudolitoralis Clessin, 1875 — Westerlund, 1890: 63.

+ Unio crassus var. maximus Kobelt, 1872 — Kobelt, 1884: 67.

= Unio batavus var. pseudo-litoralis Clessin — Clessin, 1877: 469, fig. 305.