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), ..., Lopes-Lima et al. (2024), Wu et al. (2024), 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), ..., Lopes-Lima et al. (2024), Wu et al. (2024), 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)