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
Thu 18 Dec 2025

Bivalvia | Sphaerioida | Sphaerioidea | Sphaeriidae | Sphaeriinae | Sphaerium ryckholtii

nominal species Cyclas ryckholtii Normand, 1844

= Sphaerium ryckholtii

Taxonomic Opinions

= Sphærium ryckholtii Normand, 1844 — Prime, 1895