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

Data last updated
Mon 1 Dec 2025

Bivalvia | ... | Hyrioidea | Hyriidae | Hyriinae | Rhipidodontini | Diplodon rotundus

nominal species Unio quadrans Lea, 1860

Unio quadrans Lea, 1860 = Diplodon rotundus

Lea, 1860. Proc. Acad. Nat. Sci. 12: 306.
Lea, 1860. Jour. Acad. Nat. Sci. 4 [O. 8]: 360 [42], pl. 61, fig. 185.
Type(s): HOLOTYPE ANSP_125601, Texas.

= Diplodon rotundus

Taxonomic Opinions

+ Diplodon fontainianus (Orbigny, 1835) — Simone, 2006

+ Diplodon (Rhipidodonta) fontainianus (d’Orbigny, 1835) — Haas, 1969

+ Diplodon rotundus rotundus (Wagner, 1827) — Parodiz, 1968

+ Diplodon (Cyclomya) fontainianus (d’Orbigny, 1835) — Haas, 1931

+ Diplodon (Cyclomya) fontainianus (Orb.) — Haas, 1930

= Diplodon (s.s.) quadrans (Lea, 1860) — Simpson, 1914

= Diplodon (s.s.) quadrans (Lea, 1860) — Simpson, 1900

= Unio quadrans Lea — Singley, 1893

= Unio quadraus [sic] Lea — B.H. Wright, 1888

= Margaron (Unio) quadrans (Lea) — Lea, 1870