Family Unionidae
Unionidae is a family in the order Unionoida. Browse 3 named species recorded in this family, or open an individual profile for its available identification and natural-history information.
Species in Unionidae (3)
Duck Mussel
Anodonta anatina
One of the largest of our freshwater bivalves, typically 75mm but up to 120mm in length. It has a thin shell and is generally slim when closed. Brown and yellow in colour. The hinge margin is notably angled from the mid-axis. The Swan Mussel, Anadont
Swan Mussel
Anodonta cygnea
This aquatic bivalve mollusc is a large species of freshwater mussel. The shell is thin but large (approximately 10 to 14cm when adult) and rather flat, even at the umbo. The shell colour is often pale greenish or brownish. Younger specimens can be d
Painter's Mussel
Unio pictorum
Typically 70-80mm long but can be over 100mm. Elongate with the length at least twice the height. The hinge is long, straight and horizontal. The shell is usually a yellow/olive colour with brown growth lines visible. It is only likely to be confused