How to Distinguish from Similar Species: Mya truncata
and Platyodon cancellatus
have a truncate posterior end and rarely exceed 7 cm. This species may be found along with horse clams such as Tresus capax
and may look like a small individual of that species or especially like Tresus nuttallii
, but the horse clams such Tresus capax
have a chondrophore in BOTH valves and a large gape between the valves at the posterior end (photo).