MUSSELpdb
Taxonomy
Species & Genus Richness of
freshwater mussels
by Taxonomy
Species & Genus Richness of
freshwater bivalves
by Family
Geography
Species Richness & Endemism of
freshwater mussels
by Geography
Data last updated
Mon 2 March 2026
Bivalvia | ... | Unionoidea | Unionidae | Ambleminae | Quadrulini | Uniomerus declivis
nominal species Unio excultus Conrad, 1838
Unio excultus Conrad, 1838 = Uniomerus declivis
Conrad, 1838. Monogr. Fam. Unionidae 2(11): 99, pl. 55, fig. 1.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 249.
Taxonomic Opinions
+ Uniomerus tetralasmus (Say, 1831) — Williams et al., 2014: 349.
= Uniomerus excultus (Conrad, 1838) — ITIS, 2012: [web].
+ Uniomerus tetralasmus (Say, 1831) — IUCN, 2012: [web].
+ Uniomerus tetralasmus (Say, 1830) — Williams et al., 2008: 746.
+ Uniomerus declivis (Say, 1831) — Graf & Cummings, 2007: 308.
+ Uniomerus tetralasmus (Say, 1830) — Parmalee & Bogan, 1998: 240.
+ Uniomerus declivis (Say, 1831) — Turgeon et al., 1998: 185.
= Uniomerus excultus (Conrad) — Williams et al., 1993: 14.
= Uniomerus excultus (Conrad, 1838) — Turgeon et al., 1988: 33.
= Uniomerus excultus (Conrad) — Davis, 1984: 631.
= Uniomerus excultus (Conrad) — Davis, 1983: 197, fig. 1C.
+ Uniomerus tetralasmus (Say, 1830) — Burch, 1975: 163.
+ Uniomerus tetralasmus (Say, 1831) — R.I. Johnson, 1972: 221.
+ Uniomerus tetralasmus (Say, 1831) — R.I. Johnson, 1970: 339.
+ Uniomerus tetralasmus (Say, 1831) — Haas, 1969: 209.
+ Elliptio (Uniomerus) tetralasmus (Say, 1831) — Frierson, 1927: 34.
+ Unio (sec. Uniomerus) tetralasmus Say, 1831 — Simpson, 1914: 705.
+ Unio (sec. Uniomerus) tetralasmus Say, 1830 — Simpson, 1900: 740.
+ Unio (s.s.) tetralasmus Say, 1831 — Call, 1900: 518.
+ Unio tetralasmus Say, 1830 — Call, 1895: 52, pl. 20, figs. 1-3.
+ Margaron (Unio) declivis (Say) — Lea, 1870: 54.
= Unio (Uniomerus) excultus Con. — Conrad, 1853: 249, 268.
+ Margaron (Unio) declivis (Say) — Lea, 1852: 33.
= Unio excultus Conrad, 1838 — Conrad, 1838: 99, pl. 55, fig. 1.
