Atlantic Kitten's Paw (also known as Kitten's Paw)
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Plicatulidae, Genus: Plicatula, Species: Plicatula gibbosa · Plicatulidae (Kitten's Paw family) · Bivalve (two-shelled mollusk), single valve shown. Sub-ovate to triangular fan shape.
Species
Plicatula gibbosa
Shell Type
Bivalve (two-shelled mollusk), single valve shown. Sub-ovate to triangular fan shape.
Family
Plicatulidae (Kitten's Paw family)
Size
Approximately 0.75 to 1.0 inch (19-25 mm) in length, resting in the center of a human palm. This is within the average adult size range of 0.5 to 1.25 inches for this species.
Color & Pattern
Overall tan to yellowish-brown, brownish-orange coloration. The surface displays strong radial ribs with moderate erosion, giving it an earthy, slightly weathered appearance consistent with a beach-cast specimen.
Rarity
Common to Very Common along North Carolina beaches, especially after storms or high tides.
Habitat
Found in shallow subtidal marine waters, attached to rocks, shells, pilings, and hard substrate, ranging from shallow depths down to approximately 100 feet (30 meters).
Geographic Range
Western Atlantic Coast, ranging from North Carolina south through Florida, the Gulf of Mexico, the Caribbean, and down to Brazil. Finding it in Oak Island, NC aligns directly with its northern natural distribution boundary.
Description
A small, thick, sturdy bivalve valve resembling a feline paw. The exterior is marked by prominent, knobby radial ribs radiating from the beak toward the scalloped margin, textured with dense growth lines.
Key Features
Distinctive paw-like shape, thick heavy shell relative to its small size, strong radial plications (ribs) creating a wavy or scalloped edge, and a hooked or slightly curved beak area.
Collector Value
Low monetary value ($1 - $3) due to its abundance, but highly popular among beachcombers, craft enthusiasts, and local shell collectors for its cute, recognizable shape.
Condition Notes
Beach-worn condition with moderate surface erosion, softened rib spines, and water-softened coloration. Overall intact with no major fractures, making it a good, beach-found reference specimen (Grade: Fine/Good).
Interesting Facts
Kitten's Paws attach themselves to hard objects using a cement-like secretion from their right valve, similar to oysters. Their common name comes from their uncanny resemblance to tiny animal paws or toes when viewed exteriorly.
Ecological Role
Benthic filter feeder that removes plankton and organic detritus from the water column, helping clarify coastal water. Served as prey for drilling gastropods, sea stars, and crabs.
Similar Species
Spiny Jewelbox (Arcinella cornuta) which has larger, spikier spines and a different hinge structure, or small juvenile Scallops (Pectinidae) which have distinct lateral 'ears' missing in Kitten's Paws.
Beach Finding Tips
Look along the wrack line and in shell beds near the water line after low tide along South-facing North Carolina beaches like Oak Island. Their small, thick structure helps them survive wave action intact.
Notes
Oak Island NC