MUSSELp
 
MUSSELpdb
 
 
Taxonomy
 
 
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:

Publication Yen (1952): summary
     publication summary

Complete Citation

Yen, T.-C. 1952. Molluscan fauna of the Morrison Formation. U.S. Geol. Surv. Prof. Pap. 233-B: 21-51.

Attributed Nominal Genera

Hadrodon Yen, 1952
Yen, 1952. U.S. Geol. Surv. Prof. Pap. 233-B: 37.
Type species: Hadrodon jurassicus Yen, 1952 (orig. desig.) = Hadrodon jurassicus

Attributed Nominal Species

Hadrodon jurassicus Yen, 1952
Yen, 1952. U.S. Geol. Surv. Prof. Pap. 233-B: 37, pl. 4, figs. 2a-f.

Hadrodon lateralis Yen, 1952
Yen, 1952. U.S. Geol. Surv. Prof. Pap. 233-B: 38, pl. 5, figs. 2a-f.

Hadrodon trigonus Yen, 1952
Yen, 1952. U.S. Geol. Surv. Prof. Pap. 233-B: 38, pl. 4, figs. 3a-f; pl. 5, figs. 1a-d.

Unio mammillaris Yen, 1952
Yen, 1952. U.S. Geol. Surv. Prof. Pap. 233-B: 36, pl. 4, figs. 1a-e.

Unio stewardi utahensis Yen, 1952
Yen, 1952. U.S. Geol. Surv. Prof. Pap. 233-B: 36, pl. 3, figs. 3a-e.

Taxonomic Opinions

Hadrodon jurassicus n. sp.

Hadrodon lateralis n. sp.

Hadrodon trigonus n. sp.

Unio baileyi Logan

Unio felchi White = Elliptio felchii

Unio iridoides White

Unio knighti Logan = Unio knightii

Unio lapilloides White

Unio macropisthus White

Unio mammillaris n. sp.

Unio nucalis Meek and Hayden

Unio stewardi White = Pleurobema stewardi

Unio stewardi utahensis n. sp. = Pleurobema stewardi

Unio toxonotus White = Lampsilis toxonotus

Unio willistoni Logan

Vetulonaia faberi Holt

Vetulonaia mayoworthensis Branson

Vetulonaia whitei Branson

 
NSF icon MUSSEL icon
"Making the world a better place, one mollusk at a time."