iNat·91616GenusMollusca5,095 field observationsThe Nature Library · Open stacks
- Animals
- ›Molluscs
- ›Bivalves
- ›Autobranchia
- ›Heteroconchia
- ›Freshwater Mussels and Brooch Clams
- ›Freshwater Mussels
- ›Unionoidea
- ›River Mussels
- ›Ambleminae
- ›Quadrulini

Quadrula
Quadrula is a genus of freshwater mussels, aquatic bivalve mollusks in the family Unionidae native to rivers of the American Midwest and mid-south. All have thick nacreous shells with well-developed hinge teeth, many also with external shell sculpturing of nodules or lumps.
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Where it lives
Recorded sightings
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geo-referenced records in GBIF, from museums, herbaria and field observers.
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In the stacks
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Every page naming Quadrula in the Biodiversity Heritage Library →
This page is assembled live from iNaturalist, GBIF, Wikipedia, the Source Library and the Internet Archive. It is not yet part of the hand-edited codex. iNaturalist taxon 91616.



