species Unio tumidiformis Castro, 1885: synonymy

Unio eupygus da Silva e Castro, 1885

da Silva e Castro, 1885. Bull. Soc. Malac. France 2: 287.

Unio crassus batavus — Haas (1940), Haas (1969)
Unio tumidiformis — Reis & Araujo (2009), Araujo et al. (2009), Fauna Europaea (2012), Lopes-Lima et al. (2024)

Unio macropygus da Silva e Castro, 1885

da Silva e Castro, 1885. Bull. Soc. Malac. France 2: 286.

Unio crassus batavus — Haas (1940), Haas (1969)
Unio tumidiformis — Reis & Araujo (2009), Araujo et al. (2009), Lopes-Lima et al. (2024)

Unio sadoicus da Silva e Castro, 1885

da Silva e Castro, 1885. Bull. Soc. Malac. France 2: 284.

Unio crassus batavus — Haas (1940), Haas (1969)
Unio tumidiformis — Reis & Araujo (2009), Araujo et al. (2009), Fauna Europaea (2012), Lopes-Lima et al. (2024)

Unio tumidiformis da Silva e Castro, 1885

da Silva e Castro, 1885. Bull. Soc. Malac. France 2: 283.

Unio crassus batavus — Haas (1940), Haas (1969)
Unio tumidiformis — Reis & Araujo (2009), Araujo et al. (2009), Araujo et al. (2009), Bogan (2010), Khalloufi et al. (2011), ... Lyubas et al. (2022), Lopes-Lima et al. (2024), Hou et al. (2024), Campbell & Lydeard (2026), Prie et al. (2026)

Unio baeticus Kobelt, 1888

Kobelt, 1888. Icon. Land- und Süssw.-Moll. 3: 55, pl. 89, fig. 495.

Unio crassus batavus — Haas (1940), Haas (1969)
Unio tumidiformis — Reis & Araujo (2009), Araujo et al. (2009), Fauna Europaea (2012), Lopes-Lima et al. (2024)

Unio callipygus Drouët, 1893

Drouët, 1893. J. de Conch. 41: 172.
Drouët, 1893. Mém. Acad. Sci. Dijon 4: 203, pl. 2, fig. 1.

Unio callipygus — Kobelt (1903)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio tumidiformis — Reis & Araujo (2009), Araujo et al. (2009), Lopes-Lima et al. (2024)

Unio conimbricus Kobelt, 1893

Kobelt, 1893. Icon. Land- und Süssw.-Moll. 6: 99, pl. 180, fig. 1133.

Unio crassus batavus — Haas (1940), Haas (1969)
Unio tumidiformis — Reis & Araujo (2009), Araujo et al. (2009), Lopes-Lima et al. (2024)

Unio batavus Morelet, 1845

(misidentified reference to Mya batava Maton & Rackett, 1807)
Morelet, 1845. Moll. Terr. Fluv. Portugal: 109.

Unio tumidiformis — Araujo et al. (2009), Fauna Europaea (2012), Lopes-Lima et al. (2024)

Unio callypigus Araujo et al., 2009

(error for Unio callipygus Drouët, 1893)
‘Drouët’ Araujo et al., 2009. Iberus 27(2): 49.