Painter's Mussel
Unio pictorum
This record describes Unio pictorum (species). Recorded family: Unionidae. Recorded order: Unionoida.
Identification and Appearance
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 with Unio tumidus. Lowland rivers, canals, lakes and reservoirs. Mainly found across England but not in Scotland nor the west of Wales.
Classification
Habitat and Range
Habitat
Lowland rivers, canals, lakes and reservoirs.
Seasonal Activity
All year.
Additional species information
Recorded status
Mainly found across England but not in Scotland nor the west of Wales.
About Unionoida: the wider group
Order-level background for Unionoida, the group containing Unio pictorum. Species-specific details appear above.
Group overview
This is a smaller arthropod order with specialized ecological roles. Arthropods are the most diverse animal phylum, comprising over 80% of all known animal species with approximately 1.2 million described species globally.
Ecological role of the group
Members of this order contribute to broader arthropod ecosystem functions including decomposition, predation, and serving as food sources for vertebrates. Arthropod biodiversity is essential for ecosystem resilience.
Economic and practical significance of the group
While this order has limited direct economic impact, arthropods collectively provide ecosystem services worth trillions of dollars annually through pollination, decomposition, pest control, and nutrient cycling.
Recorded sources for this group: General entomology and arthropod research. Imported estimates may describe particular regions or reporting periods.
Photos of Painter's Mussel (10)
Frequently Asked Questions About Painter's Mussel
What is Painter's Mussel?
Painter's Mussel (Unio pictorum) is a species in the family Unionidae, within the order Unionoida.
How big is Painter's Mussel?
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.
Where is Painter's Mussel found?
Habitat: Lowland rivers, canals, lakes and reservoirs.
When is Painter's Mussel active?
Painter's Mussel: seasonal activity - All year..