species Unio ionicus Drouët, 1879: synonymy

Unio ionicus ‘Blanc, in litt.’ Drouët, 1879

(correct name for Unio jonicus ‘Drouët’ of Authors)
‘Blanc, in litt.’ Drouët, 1879. J. de Conch. 27: 329.
TYPE ANSP_332761, Santa Maura Is., Greece.

Unio crassus jonicus [sic] — Haas (1940), Haas (1969), Fauna Europaea (2012), Lopes-Lima et al. (2017)
Unio (Crassunio) crassus ionicus — Bank (2006)
Unio ionicus — Araujo et al. (2018), Graf & Cummings (2021), Príe et al. (2021), Lopes-Lima et al. (2021), Lyubas et al. (2022), Lopes-Lima et al. (2024), Hou et al. (2024), Nagel (2025), Campbell & Lydeard (2026), Prie et al. (2026)

Unio jonicus ‘Drouët’ of Authors

(error for Unio ionicus ‘Blanc, in litt.’ Drouët, 1879)
‘Drouët’ of Authors.
Kobelt, 1886. Icon. Land- und Süssw.-Moll. 2: 43.
Westerlund, 1890. Fauna Paläarct. Binnenconch. 2(7): 153.
Kobelt, 1893. Icon. Land- und Süssw.-Moll. 6: 87.
Haas, 1940. Zool. Ser. Field Mus. Nat. Hist. 24: 131.
Haas, 1969. Das Tierreich 88: 52.
Lopes-Lima et al., 2017. Biol. Rev. 92(1): 578.
Lyubas et al., 2022. Diversity 14(11), 935: Table S3.

Unio helenae Drouët, 1892

Drouët, 1892. J. de Conch. 40: 87.
‘Drouët in sched.’ Kobelt, 1893. Icon. Land- und Süssw.-Moll. 6: 87, pl. 173, fig. 1114.
SYNTYPE SMF 4471, Agios Mathaios, Greece.

Unio crassus jonicus [sic] — Haas (1940), Haas (1969), Fauna Europaea (2012)
Unio (Crassunio) crassus ionicus — Bank (2006)
Unio ionicus — Lopes-Lima et al. (2024), Nagel (2025)

Unio scissus Drouët, 1893

Drouët, 1893. J. de Conch. 41: 40.

Unio crassus bruguierianus — Haas (1940), Haas (1969)
Unio (Crassunio) crassus bruguierianus — Bank (2006)
Unio ionicus — Lopes-Lima et al. (2024)