MUSSELpdb | valid gen. Medionidus synonymy

	Home \| About \| Database \| Mussel of the Month \| Publications & Presentations


MUSSELpdb
	Introduction Browse d'basing


Taxonomy
	all genera Unionidae Margaritiferidae Hyriidae Etheriidae Mycetopodidae Iridinidae Species & Genus Richness by Taxonomy


Geography
	Summary North America Central America South America Afrotropics North Eurasia East Asia Australasia Species Richness & Endemism by Geography

Page last updated
Wed 1 October 2025

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

FM(U)otW(aolcb) is the web version of the MUSSEL Project Database. Follow the links to browse the data or use the custom Google search field. Either way, you win!

Search the database pages:

genus Medionidus Simpson, 1900: synonymy
6 Recent freshwater species (7 total species)

Medionidus Simpson, 1900
Simpson, 1900. Proc. Acad. Nat. Sci. 52: 77.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 588.
Simpson, 1914. Descr. Cat. Naiades: 245.
Type species: Unio conradicus Lea, 1834 (orig. desig.) = Medionidus conradicus

Medonidus Iredale, 1934
Iredale, 1934. Austral. Zool. 8: 76.
(error for Medionidus Simpson, 1900)

Taxonomic History (since 1900)

Medionidus — Simpson (1900), Simpson (1900), Ortmann (1912), Simpson (1914), Ortmann (1915), ... Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023), Hauck et al. (2023), FMCS (2025)
Unio — de Gregorio (1914), Henderson (1935)
Rhabdotophorus — Modell (1957)

"Making the world a better place, one mollusk at a time."
	The MUSSEL Project — Home Page https://musselpdb.org/. Site developed and maintained by Dan Graf & Kevin Cummings. Funded by The National Science Foundation.