no photo — written note
InsectsSensitive species
Flattened riffle mussel restricted to swift clean water.
Field facts
HabitatSwift gravel riffles
RangeVery local, northern Indiana
When to lookYear-round
StatusFederally endangered (Indiana DNR / IUCN Red List)
Look-alikesClubshell, Snuffbox
Field note: Riffleshells clamp onto a darter's snout to load their larvae.
Lesson
Watching responsibly
Boots and silt kill riffle mussels; stay out of known beds.
This species is treated as sensitive: locations are generalised to county level and never routed to directly.
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