Kitten's Paw Shell, also known as Atlantic White Kitten's Paw
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Plicatula, Species: Plicatula gibbosa · Pectinidae (Scallop family) and Plicatulidae (Kitten's paw family) · Bivalve (two-shelled), whole shell, irregular fan shape
Species
Plicatula gibbosa
Shell Type
Bivalve (two-shelled), whole shell, irregular fan shape
Family
Pectinidae (Scallop family) and Plicatulidae (Kitten's paw family)
Size
Approximately 0.5 to 1 inch in length, which is average for this species. Adults typically range from 0.5 to 1.25 inches.
Color & Pattern
Off-white to grayish base color with subtle reddish-brown or purple radial streaks and banding. The colors appear natural but slightly weathered from surf action. Interior is smooth with a matching muted tone and prominent hinge teeth.
Rarity
Common
Habitat
Found attached to hard substrates, rocks, coral, or other shells in shallow subtidal to moderately deep offshore waters. Marine environment.
Geographic Range
Western Atlantic Ocean, ranging from North Carolina through Florida, the Gulf of Mexico (including Texas), and the Caribbean down to South America.
Description
A charming and sturdy small bivalve characterized by its roughly triangular to fan-like shape and distinct, strong plications or ribs radiating from the umbo. The margins are conspicuously toothed or crenulated, interlocking tightly when closed. Its textured exterior features rough growth lines crossing the prominent ribs.
Key Features
Strong, interlocking radial ribs (folds), a prominent and asymmetrical umbo, powerful internal hinge teeth characteristic of the Plicatulidae family, and a strongly crenulated margin.
Collector Value
Low to moderate value. While widely collected by beachcombers due to their appealing shape and size, they are common enough that individual specimens hold little monetary value, though pristine paired valves are appreciated in craft and starter collections.
Condition Notes
Good condition, showing minor natural beach wear on the exterior ribs and margins, intact structure, and no major cracks or bore holes.
Interesting Facts
Unlike free-swimming scallops, Kitten's Paws cement themselves directly to hard surfaces using their right valve early in life, much like oysters. Their common name comes from the paw-like appearance of the shell with its prominent ridges resembling toes.
Ecological Role
Acts as part of the benthic filter-feeding community, helping to clear particulate matter from the water column. Serves as a food source for carnivorous gastropods, crabs, and fish.
Similar Species
Atlantic Wing Oyster (Pteria colymbus) and various small juvenile scallops, but distinguished by the heavy, interlocking plications and the lack of a true byssal notch or wing structure.
Beach Finding Tips
Look along shell lines on high-energy sandy and shelly beaches, especially after storms or heavy high tides. Scrutinize shelly drift debris where small micro-shells accumulate.
Notes
Surfside Beach Texas