Blood Ark

Lunarca ovalis

Markings and exact colorations may vary.

A stout ribbed ark named for the red blood of the living animal, unusual among clams.

Typical size
1.5–2.5 in
How often it turns up
Common
Collecting
Usually legal to collect

Empty valves are free to keep. Live arks should be left in place.

Handling
Safe to handle

How to tell it apart

  • Roughly oval, heavily ribbed valves
  • Straight hinge line with many small teeth
  • Often stained rusty or dark from sediment

Where to find these in Florida

Beaches rated very good or excellent for shells. Each page shows today’s score, the best window and access details.

Found one?

Photograph it and BeachNut ranks the likely matches with a confidence read, then logs it to your collection with the beach and date.

Browsing beaches and the full field guide is free. A free account logs unlimited finds and gives you three photo identifications a day.

More shells in the field guide

Browse every shells in the guide

Get Florida beachcombing tips

Occasional emails: what's washing up, shelling tips and new BeachNut features. No spam, unsubscribe any time.