Dungeness Crab Carapace
Scientific Name: Metacarcinus magister
Category: other
Brief Description
The discarded upper shell (carapace) of a Dungeness crab found on a sandy beach.
Characteristics
A broad, oval-shaped shell with a serrated front edge containing ten small teeth on each side of the eyes. It is typically brownish to purple in color with a granular texture.
Habitat
Intertidal and subtidal zones of sandy or muddy bays and the open ocean.
When to Find It
Carapaces are frequently found washed ashore after mass molting events, often in late spring or summer.
Conservation Status
N/A
Ecological Role
Crabs are important scavengers and predators; their discarded shells provide calcium back to the marine environment as they break down.
Easily Confused With
Red Rock Crab (Cancer productus), which has a thicker shell and darker red color, and Jonah Crabs, which have more robust claws and different shell serrations.
Observation Tips
Look for these along the high-tide line after a storm or during molting seasons. Be careful of sharp edges.
Interesting Facts
Finding a shell like this doesn't necessarily mean a crab died; crabs must shed their entire hard exoskeleton in a process called molting in order to grow larger.