SIZE :
From 7.5 cm to 13 cm, up to 16 cm.
LIFE EXPECTANCY :
40 years, up to 92 years.
LIFE CYCLE :
Sexual maturity when the Stimpson’s surf clam reaches around 6 cm.
Individuals are either male or female.
Reproduction takes place between late June and late July. Adults release eggs and sperm into the water column in a synchronized manner. The fertilized eggs will release larvae, which live for several weeks in the open sea before settling to the bottom and beginning their sedentary shellfish life.