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Wed 1 October 2025

The Freshwater Mussels (Unionoida) of the World (and other less consequential bivalves)

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Publication R.I. Johnson (1999): summary
     publication summary

Complete Citation

Johnson, R.I. 1999. Unionidae of the Rio Grande (Rio Bravo del Norte) system of Texas and Mexico. Occasional Papers on Mollusks 6(77): 1-65. Available electronically.

Attributed Nominal Species

Unio bealii Singley, 1893
‘Lea’ Singley, 1893. Geol. Surv. Texas (1892): 321.
R.I. Johnson, 1999. Occ. Pap. Moll. 6(77): 35 [as ‘Unio beali’].

Unio heermanii B.H. Wright, 1888
‘Lea’ of Authors.
B.H. Wright, 1888. Check List N. Amer. Unionidae etc.: [3].
Singley, 1893. Geol. Surv. Texas (1892): 322.
R.I. Johnson, 1998. Occ. Pap. Moll. 5(76): 448.
R.I. Johnson, 1999. Occ. Pap. Moll. 6(77): 27.

Unio taumilipanus R.I. Johnson, 1999
‘Conrad’ R.I. Johnson, 1999. Occ. Pap. Moll. 6(77): 19.

Unio texasensis Lea, 1860
‘Lea’ of Authors.
Lea, 1860. Jour. Acad. Nat. Sci. 4 [O. 8]: 359.
Lea, 1870. Synopsis Fam. Naiades: 59.
B.H. Wright, 1888. Check List N. Amer. Unionidae etc.: [5].
Pilsbry & Rhoads, 1896. Proc. Acad. Nat. Sci. 48: 505.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 563.
Ortmann, 1915. Nautilus 28(12): 141.
Utterback, 1916. Amer. Midl. Nat. 4(9): 398.
Gordon et al., 1979. Bull. AMU (1979): 35, Table 3.
Cummings & Mayer, 1992. Freshw. Mussels Midwest (5): 134.
Vidrine, 1993. Histr. Distr. Freshw. Mussels LA: 169.
R.I. Johnson, 1999. Occ. Pap. Moll. 6(77): 34.
Bogan, 2010. FADA: [web].
ITIS, 2012. ITIS: [web].
Haag, 2012. N. Amer. Freshw. Mussels: 70 [as ‘Toxolasma texasensis’].
McMurray et al., 2012. Mo. Freshw. Mussels: 57 [as ‘Toxolasma texasense’].
Marshall et al., 2018. Amer. Malac. Bull. 36(1): 44.

Taxonomic Opinions

Anodonta (Pyganodon) grandis Say, 1829 = Pyganodon grandis
+ Anodonta lugubris Say, 1829
+ Anodonta bealei Lea, 1863

Anodonta (Utterbackia) imbecillis Say, 1829 = Utterbackia imbecillis

Cyrtonaias tampicoensis (Lea, 1838) = Mesonaias tampicoensis
+ Unio tecomatensis Lea, 1841
+ Unio grandensis Conrad, 1855
+ Unio berlandierii Lea, 1857
+ Unio saladoensis Lea, 1860
+ Unio heermannii Lea, 1861
+ Lampsilis (Cyrtonaias) tampicoensis kusteriana Frierson, 1927

Cyrtonaias tampicoensis (Lea, 1838) = Cyrtonaias berlandierii

Disconaias conchos Taylor, 1997

Lampsilis teres (Rafinesque, 1820)
+ Unio anodontoides Lea, 1831

Lampsilis teres fallaciosa (Smith, 1899) = Lampsilis teres

Megalonaias nervosa (Rafinesque, 1820)
+ Unio crassus var. giganteus Barnes, 1823
+ Unio eightsii Lea, 1860

Popenaias popei (Lea, 1857) = Popenaias popeii

Potamilus metnecktayi Johnson, 1998
+ Lampsilis salinasensis Metcalf, 1982

Potamilus purpuratus (Lamarck, 1819)

Quadrula apiculata (Say, 1829) = Quadrula quadrula
+ Unio speciosus Lea, 1862

Quadrula couchiana (Lea, 1860)

Quincuncina mitchelli (Simpson, 1896)
+ Unio taumilapanus Conrad, 1855
+ Unio tamaulipasensis Fischer & Crosse, 1894
+ Unio iheringi B.H. Wright, 1898
+ Unio (sec. Elliptio) mitchelli var. elongatus Simpson, 1914
+ Quincuncina guadalupensis Wurtz, 1950

Quincuncina mitchelli (Simpson, 1896) = Fusconaia mitchelli

Quincuncina mitchelli (Simpson, 1896) = Fusconaia iheringi

Toxolasma parvus (Barnes, 1823) = Toxolasma parvum
+ Unio haleianus Lea, 1842
+ Unio texasiensis Lea, 1857
+ Unio bairdianus Lea, 1857
+ Unio bealei Lea, 1862
+ Lampsilis (Carunculina) texasensis var. compressus Simpson, 1900
+ Lampsilis mearnsi Simpson, 1900

Toxolasma parvus (Barnes, 1823) = Toxolasma texasiense

Toxolasma parvus (Barnes, 1823) = Leaunio lienosus

Truncilla donaciformis (Lea)
+ Unio zigzag Lea, 1829
+ Unio macrodon Lea, 1859
+ Unio cognatus Lea, 1860

Truncilla donaciformis (Lea) = Truncilla cognata

Truncilla donaciformis (Lea) = Truncilla macrodon

Uniomerus tetralasmus (Say, 1831)
+ Unio declivis Say, 1831
+ Unio manubius Gould, 1855

Uniomerus tetralasmus (Say, 1831) = Uniomerus declivis

 
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