Common Slipper Shell
Scientific Name: Crepidula fornicata
Category: shell
Brief Description
A rounded, convex marine gastropod shell known for its internal shelf that resembles a boat or slipper.
Characteristics
The shell is oval and highly convex with a smooth but often eroded surface. The interior features a white, horizontal shelf or deck that covers about half of the aperture. Color is typically tan or dull white with mottled brown streaks.
Habitat
Found in shallow coastal waters, estuaries, and bays, often attached to rocks, other shells, or submerged debris.
When to Find It
Can be found year-round on beaches as washed-up shells or in tide pools.
Conservation Status
N/A
Ecological Role
They are filter feeders that help clarify water. They often form stacks, with the largest (oldest) at the bottom being female and the smaller (younger) on top being male.
Easily Confused With
Eastern White Slipper Shell (Crepidula plana), which is much flatter and usually white. Other limpets lack the internal shelf.
Observation Tips
Look for these along the high-tide line on sandy or gravelly beaches. They are often found stacked on top of one another or attached to Horseshoe Crab shells.
Interesting Facts
This species is a sequential hermaphrodite, meaning individuals start their lives as males and later transition into females as they grow larger and older.