Unio delphinus Spengler, 1793
Spengler, 1793, Skr. Naturhist. Selsk. 3: 63, no. 28.

Unio delphinus — Spengler (1793), Simpson (1900), Simpson (1914), Araujo et al. (2009), ..., Bashê (2022), Wu et al. (2023), Dai et al. (2024), Wu et al. (2024)
Margaron (Unio) pictorum — Lea (1870)
Unio rostratus var. delphinus — Westerlund (1890)
Unio pictorum delphinus — Haas (1940), Haas (1969)

Unio mucidus Morelet, 1845
Morelet, 1845, Moll. Terr. Fluv. Portugal: 111, pl. 14, fig. 3.
Type(s): HOLOTYPE BMNH_92-2-4-1974, le Cavado, Portugal.

Unio mucidus — Morelet (1845), Westerlund (1890), Kobelt (1893)
Margaron (Unio) pictorum — Lea (1852), Lea (1870)
Unio pictorum — Reeve (1865), He & Zhuang (2013)
Unio (Mucidusiana) mucidus — Locard (1889)
Unio (groupe de l’U. mucidus) mucidus — Locard (1899)
Unio (sec. Lymnium) pictorum — Simpson (1900), Simpson (1914)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Fauna Europaea (2012), Lopes-Lima et al. (2017), Araujo et al. (2018)

Unio hispanus Rossmässler, 1844
‘Moq.-Tand. in litt.’ Rossmässler, 1844, Icon. Land- und Süssw.-Moll. 2 (6): 26, pl. 56, fig. 747.

Unio hispanus — Rossmässler (1844), Westerlund (1890)
Margaron (Unio) batavus — Lea (1852), Lea (1870)
Unio (Hispaniana) hispanus — Locard (1889)
Unio (Groupe de l’U. danielis) hispanus — Locard (1893)
Unio (groupe de l’U. hispanus) hispanus — Locard (1899)
Unio (sec. Lymnium) turtoni — Simpson (1900), Simpson (1914)
Unio requieni — Germain (1931)
Unio pictorum delphinus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009), Fauna Europaea (2012)
Unio mancus requienii — Prie (2012)

Unio dactylus Morelet, 1845
Morelet, 1845, Moll. Terr. Fluv. Portugal: 110, pl. 14, fig. 2.
(homonym of Unio dactylus Lea, 1840)
Type(s): HOLOTYPE BMNH_93-2-4-1587, Guadiana, near Castro, Portugal.

Unio dactylus — Morelet (1845), Westerlund (1890), Kobelt (1893)
Margaron (Unio) pictorum — Lea (1852), Lea (1870)
Unio pictorum — Reeve (1865)
Unio (groupe de l’U. dactylus) dactylus — Locard (1899)
Unio (sec. Lymnium) pictorum — Simpson (1900), Simpson (1914)
Unio pictorum delphinus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009), Fauna Europaea (2012)

Unio hispanicus Graëls, 1846
Graëls, 1846, Catal. Moll. Esp.: 22.
‘Moquin. Rossm.’ Lea, 1852, Synopsis Fam. Naiades: 30.
‘Moquin. Rossm.’ Lea, 1870, Synopsis Fam. Naiades: 48.
(error for Unio hispanus Rossmässler, 1844)

Unio hispanicus — Graëls (1846)
Unio (groupe de l’U. hispanus) hispanus — Locard (1899)

Unio requienii var. arcuata Drouët, 1857
Drouët, 1857, Étud. Naïades. France, Unio: pl. 7, fig. 3.
de Joannis, 1859, Ann. Soc. Linn. Maine-et-Loire 3: 291, pl. 11, fig. 2.
(misidentified reference to Unio arcuata Jacquemin, 1835)

Unio requienii var. arcuata — Drouët (1857)
Unio requienii var. arcuatus — de Joannis (1859)
Unio (Cyrtusiana) sousanus — Locard (1889)
Unio (groupe de l’U. cyrtus) sousanus — Locard (1899)
Unio (Cyrtusiana) souzanus — Germain (1904)
Unio requieni — Germain (1931)

Unio hispanus Lowe, 1860
Lowe, 1860, unknown publication: 176.
(reference to Unio hispanus Rossmässler, 1844)

Unio hispanus — Lowe (1860)
Unio letourneuxi — Westerlund (1890)
Unio elongatulus durieui — Daget (1998)

Unio hyperephanus da Silva e Castro, 1885
da Silva e Castro, 1885, Bull. Soc. Malac. France 2: 289.
Castro in Locard, 1899, Conchyliol. Portug.: 244.

Unio hyperephanus — da Silva e Castro (1885), Westerlund (1890)
Unio (Hispaniana) hyperephanus — Locard (1889)
Unio (groupe de l’U. hispanus) hyperephanus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio nevesi da Silva e Castro, 1885
da Silva e Castro, 1885, Bull. Soc. Malac. France 2: 290.

Unio nevesi — da Silva e Castro (1885), Westerlund (1890)
Unio (groupe de l’U. mucidus) nevesi — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio simoesi da Silva e Castro, 1885
da Silva e Castro, 1885, Bull. Soc. Malac. France 2: 292.

Unio simoesi — da Silva e Castro (1885), Westerlund (1890)
Unio (Mucidusiana) simoesi — Locard (1889)
Unio (groupe de l’U. mucidus) simoesi — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio (hispanus var.?) sevillensis Kobelt, 1887
Kobelt, 1887, An. Soc. Españ. Hist. Nat. 16: 437.
Kobelt, 1888, Icon. Land- und Süssw.-Moll. 3: 56, pl. 89, fig. 496.
(intro'd as intra-sp. of Unio hispanus Rossmässler, 1844)

Unio (hispanus var.?) sevillensis — Kobelt (1887)
Unio (hispanus var.) sevillensis — Kobelt (1888)
Unio sevillensis — Westerlund (1890)
Unio pictorum delphinus — Haas (1940), Haas (1969)

Unio chlorellus Locard, 1889
Castro in Locard, 1889, Contr. Faune Malacol. Franc. 13: 158 [52].
(error for Unio chorellus Locard, 1899)

Unio chlorellus — Locard (1889)

Unio oncomenus Locard, 1889
Castro in Locard, 1889, Contr. Faune Malacol. Franc. 13: 152 [46].
(error for Unio oncomensis Locard, 1899)

Unio oncomenus — Locard (1889)

Unio sousanus Locard, 1889
Drouët, 1857, Étud. Naïades. France, Unio: pl. 7, fig. 3 [as ‘Unio requienii var. acruata’].
de Joannis, 1859, Ann. Soc. Linn. Maine-et-Loire 3: 291, pl. 11, fig. 2 [as ‘Unio requienii var. acruatus’].
‘Castro’ Locard, 1889, Contr. Faune Malacol. Franc. 13: 165 [59].
‘Castro’ Locard, 1893, Coqu. Eau Douce Saumâtre France: 197, fig. 211 [as ‘souzanus’].
‘Castro’ Locard, 1899, Conchyliol. Portug.: 258.
Type(s): LECTOTYPE MNHN_22545, le Rhône, à Valence (Drôme).

Unio sousanus — Locard (1889)
Unio (Cyrtusiana) sousanus — Locard (1889)
Unio arcuatus — Westerlund (1890)
Unio (Groupe de l’U. gestroianus) souzanus — Locard (1893)
Unio (groupe de l’U. cyrtus) sousanus — Locard (1899)
Unio (Cyrtusiana) souzanus — Germain (1904)
Unio requieni — Germain (1931)
Unio elongatulus requienii — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)
Unio mancus requienii — Prie (2012)

Unio subhispanus Locard, 1889
‘Castro’ Locard, 1889, Contr. Faune Malacol. Franc. 13: 171 [65], 253 [147].
‘Castro’ Locard, 1893, Coqu. Eau Douce Saumâtre France: 200.
‘Castro’ Locard, 1899, Conchyliol. Portug.: 244.
Type(s): LECTOTYPE MNHN_22562, La Loire, à Saint-Gemmes, près Angers.

Unio subhispanus — Locard (1889), Westerlund (1890)
Unio (Hispaniana) subhispanus — Locard (1889), Germain (1904)
Unio (Groupe de l’U. danielis) subhispanus — Locard (1893)
Unio (groupe de l’U. hispanus) subhispanus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)
Unio mancus requienii — Prie (2012)

Unio hispanus var. sphenoides Westerlund, 1892
Westerlund, 1892, An. Soc. Españ. Hist. Nat. 21: 390.
(intro'd as intra-sp. of Unio hispanus Rossmässler, 1844)

Unio hispanus var. sphenoides — Westerlund (1892)
Unio pictorum delphinus — Haas (1940), Haas (1969)

Unio cameratus Drouët, 1893
Drouët, 1893, J. de Conch. 41: 169.
Drouët, 1893, Mém. Acad. Sci. Dijon 4: 183, pl. 2, fig. 8.

Unio cameratus — Drouët (1893), Kobelt (1903)
Unio (groupe de l’U. mucidus) cameratus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio decurtatus Drouët, 1893
Drouët, 1893, J. de Conch. 41: 170.
Drouët, 1893, Mém. Acad. Sci. Dijon 4: 185, pl. 1, fig. 9.

Unio decurtatus — Drouët (1893), Kobelt (1903)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio gravatus Drouët, 1893
Drouët, 1893, Unionidae de l’Espagne: 49.

Unio gravatus — Drouët (1893), Kobelt (1903)
Unio pictorum delphinus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio limosellus Drouët, 1893
Drouët, 1893, J. de Conch. 41: 169.
Drouët, 1893, Mém. Acad. Sci. Dijon 4: 184, pl. 12, fig. 4.

Unio limosellus — Drouët (1893), Kobelt (1903)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio souzanus Locard, 1893
‘Castro’ of Authors.
Locard, 1893, Coqu. Eau Douce Saumâtre France: 197.
Germain, 1904, Bull. Soc. Sci. Nat. Ouest France 4: 275 [37].
Germain, 1931, Faune de France 22: 737.
Haas, 1940, Zool. Ser. Field Mus. Nat. Hist. 24: 126.
(error for Unio sousanus Locard, 1889)

Unio souzanus — Locard (1893)

Unio abrantesianus Locard, 1899
Castro in Locard, 1899, Conchyliol. Portug.: 253.

Unio abrantesianus — Locard (1899)
Unio (groupe de l’U. rostrata) abrantesianus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio allenianus Locard, 1899
Castro in Locard, 1899, Conchyliol. Portug.: 255.

Unio allenianus — Locard (1899)
Unio (groupe de l’U. rostrata) allenianus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio barbozanus Locard, 1899
Castro in Locard, 1889, Contr. Faune Malacol. Franc. 13: 160 [54]. [nomen nudum]
Castro in Locard, 1899, Conchyliol. Portug.: 233.

Unio barbozanus — Locard (1899)
Unio (Mucidusiana) barbozanus — Locard (1889)
Unio (groupe de l’U. mucidus) barbozanus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio castroi Locard, 1899
Bourguignat in Locard, 1889, Contr. Faune Malacol. Franc. 13: 160 [54]. [nomen nudum]
Bourguignat in Locard, 1899, Conchyliol. Portug.: 234.

Unio castroi — Locard (1899)
Unio (Mucidusiana) castroi — Locard (1889)
Unio (groupe de l’U. mucidus) castroi — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio chasmirhynchus Locard, 1899
Castro in Locard, 1899, Conchyliol. Portug.: 246.

Unio chasmirhynchus — Locard (1899)
Unio (groupe de l’U. hispanus) chasmirhynchus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio chorellinus Locard, 1899
Locard, 1899, Conchyliol. Portug.: 228.

Unio chorellinus — Locard (1899)
Unio (groupe de l’U. courquinianus) chorellinus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio chorellus Locard, 1899
Castro in Locard, 1889, Contr. Faune Malacol. Franc. 13: 158 [52] [as ‘chlorellus’]. [nomen nudum]
Castro in Locard, 1899, Conchyliol. Portug.: 227.

Unio chorellus — Locard (1899)
Unio (Saint-Simoniana) chlorellus — Locard (1889)
Unio (groupe de l’U. courquinianus) chorellus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio cyrtus Locard, 1899
Castro in Locard, 1889, Contr. Faune Malacol. Franc. 13: 165 [59]. [nomen nudum]
Castro in Locard, 1899, Conchyliol. Portug.: 257.

Unio cyrtus — Locard (1899)
Unio (Cyrtusiana) cyrtus — Locard (1889)
Unio (groupe de l’U. cyrtus) cyrtus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio euchasmus Locard, 1899
Castro in Locard, 1899, Conchyliol. Portug.: 249.

Unio euchasmus — Locard (1899)
Unio (groupe de l’U. hispanus) euchasmus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio hypoxanthus Locard, 1899
Casto in Locard, 1899, Conchyliol. Portug.: 226.

Unio hypoxanthus — Locard (1899)
Unio (groupe de l’U. courquinianus) hypoxanthus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio mundanus Locard, 1899
Castro in Locard, 1899, Conchyliol. Portug.: 247.

Unio mundanus — Locard (1899)
Unio (groupe de l’U. hispanus) mundanus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio neothaumus Locard, 1899
Castro in Locard, 1899, Conchyliol. Portug.: 259.

Unio neothaumus — Locard (1899)
Unio (groupe de l’U. holandrei) neothaumus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio novus Locard, 1899
Castro in Locard, 1889, Contr. Faune Malacol. Franc. 13: 165 [59]. [nomen nudum]
Castro in Locard, 1899, Conchyliol. Portug.: 258.

Unio novus — Locard (1899)
Unio (Cyrtusiana) novus — Locard (1889)
Unio (groupe de l’U. cyrtus) novus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio ocresanus Locard, 1899
Castro in Locard, 1899, Conchyliol. Portug.: 236.

Unio ocresanus — Locard (1899)
Unio (groupe de l’U. joannisi) ocresanus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio oncomensis Locard, 1899
Castro in Locard, 1889, Contr. Faune Malacol. Franc. 13: 152 [46] [as ‘oncomenus’]. [nomen nudum]
Castro in Locard, 1899, Conchyliol. Portug.: 225.

Unio oncomensis — Locard (1899)
Unio (Moreletiana) oncomenus — Locard (1889)
Unio (groupe de l’U. amblyus) oncomensis — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio paulinoi Locard, 1899
Locard, 1899, Conchyliol. Portug.: 242.

Unio paulinoi — Locard (1899)
Unio (groupe de l’U. dactylus) paulinoi — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio scalabisianus Locard, 1899
Castro in Locard, 1899, Conchyliol. Portug.: 254.

Unio scalabisianus — Locard (1899)
Unio (groupe de l’U. rostrata) scalabisianus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio schousboei Locard, 1899
Bourguignat in Locard, 1899, Conchyliol. Portug.: 250.

Unio schousboei — Locard (1899)
Unio (groupe de l’U. rostrata) schousboei — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio silvai Locard, 1899
Bourguignat in Locard, 1899, Conchyliol. Portug.: 235.

Unio silvai — Locard (1899)
Unio (groupe de l’U. mucidus) silvai — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio submucidus Locard, 1899
Castro in Locard, 1889, Contr. Faune Malacol. Franc. 13: 160 [54]. [nomen nudum]
Castro in Locard, 1899, Conchyliol. Portug.: 230.

Unio submucidus — Locard (1899)
Unio (Mucidusiana) submucidus — Locard (1889)
Unio (groupe de l’U. mucidus) submucidus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio taganus Locard, 1899
Servain in Locard, 1899, Conchyliol. Portug.: 252.

Unio taganus — Locard (1899)
Unio (groupe de l’U. rostrata) taganus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio tameganus Locard, 1899
Castro in Locard, 1889, Contr. Faune Malacol. Franc. 13: 146 [40]. [nomen nudum]
Castro in Locard, 1899, Conchyliol. Portug.: 221.

Unio tameganus — Locard (1899)
Unio (Ateriana) tameganus — Locard (1889)
Unio (groupe de l’U. ater) tameganus — Locard (1899)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio requienii taginus Kobelt, 1903
Kobelt, 1903, Icon. Land- und Süssw.-Moll. 10: 28, pl. 280, fig. 1796.
(intro'd as intra-sp. of Unio requienii Michaud, 1831; homonym of Unio littoralis taginus Kobelt, 1903)

Unio requienii taginus — Kobelt (1903)
Unio pictorum delphinus — Haas (1940), Haas (1969)
Unio delphinus — Araujo et al. (2009)

Unio subhispanicus Germain, 1931
‘Castro in Locard’ of Authors.
Germain, 1931, Faune de France 22: 737.
Prie, 2012, MalaCo 8: 432.
(error for Unio subhispanus Locard, 1889)

Unio subhispanicus — Germain (1931)
Unio requieni — Germain (1931)

Taxonomic History (since 1900)

Unio delphinus — Simpson (1900), Simpson (1914), Araujo et al. (2009), Khalloufi et al. (2011), ..., Bashê (2022), Wu et al. (2023), Dai et al. (2024), Wu et al. (2024)
Unio (sec. Lymnium) turtoni — Simpson (1900), Simpson (1914)
Unio (sec. Lymnium) pictorum — Simpson (1900), Simpson (1914)
Unio cameratus — Kobelt (1903)
Unio decurtatus — Kobelt (1903)
Unio gravatus — Kobelt (1903)
Unio limosellus — Kobelt (1903)
Unio requienii taginus — Kobelt (1903)
Unio (Cyrtusiana) souzanus — Germain (1904)
Unio (Hispaniana) subhispanus — Germain (1904)
Unio requieni — Germain (1931)
Unio subhispanicus — Germain (1931)
Unio pictorum delphinus — Haas (1940), Haas (1969)
Unio pictorum mucidus — Haas (1940), Haas (1969)
Unio elongatulus requienii — Haas (1940), Haas (1969)
Unio elongatulus durieui — Daget (1998)
Unio mancus requienii — Prie (2012)
Unio pictorum — He & Zhuang (2013)