no photo — written note
Insects
Thick triangular brown mussel, a mainstay of Indiana rivers.
Field facts
HabitatRiffles and runs with stable gravel
RangeStatewide
When to lookYear-round
StatusSecure (Indiana DNR / IUCN Red List)
Look-alikesRound Pigtoe, Threeridge
Field note: Mussels can live decades and record river history in their growth rings.
Lesson
Watching responsibly
Mussel beds mark healthy river bottom; avoid anchoring on them.
Your records
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