MUSSELp

MUSSELpdb

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Unionidae

Margaritiferidae

Hyriidae

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Mycetopodidae

Iridinidae


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Species Richness & Endemism by
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Data last updated
Mon 1 Dec 2025

Publication Yen (1952): summary

publication summary

Full 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 = Hadrodon jurassicus

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

Hadrodon lateralis Yen, 1952 = Hadrodon lateralis

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

Unio mammillaris Yen, 1952 = Unio mammillaris

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

Hadrodon trigonus Yen, 1952 = Hadrodon trigonus

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

Unio stewardi utahensis Yen, 1952 = Pleurobema stewardi

Yen, 1952. U.S. Geol. Surv. Prof. Pap. 233-B: 36, pl. 3, figs. 3a-e.
(intro'd as intra-sp. of Unio stewardi White, 1876)

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
 
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