Turkey Wing (Alternate: Zebra Mussel or similar ark shell fragment)
Phylum Mollusca, Class Bivalvia, Order Arcida, Family Arcidae, Genus Arca, Species Arca zebra · Arcidae (Ark shell family) · Bivalve (two-shelled), fragment of a shell with fan/triangular morphology
Species
Arca zebra
Shell Type
Bivalve (two-shelled), fragment of a shell with fan/triangular morphology
Family
Arcidae (Ark shell family)
Size
Approximately 0.5 to 1 inch for the fragment visible, representing a portion of a shell that typically ranges 1 to 3 inches in total length as an adult.
Color & Pattern
Distinctive alternating zebra-like stripes of reddish-brown and whitish cream. Colors appear natural and glossy with crisp definition on the exterior surface.
Rarity
Common
Habitat
Found in shallow subtidal waters, attached to hard substrates like rocks, coral rubble, or oyster reefs using strong byssal threads. Exclusively marine.
Geographic Range
Western Atlantic Ocean, ranging from North Carolina through the Caribbean, Bermuda, and down to Brazil.
Description
An attractive bivalve fragment displaying strong radial ribs crossed by growth lines, creating a checkered texture. The striking reddish-brown and white zebra-striped pattern makes even fragments easily recognizable and visually appealing.
Key Features
Bold reddish-brown and white transverse banding, strong radial ribs, and the elongated, trapezoidal shape characteristic of ark shells.
Collector Value
Low commercial value due to being a fragment, but highly valued by beginner beachcombers for its striking color pattern.
Condition Notes
Fragmentary condition with worn edges, but the surface pattern and coloration remain vibrant and well-preserved. Grade: Fair to Good as a study fragment.
Interesting Facts
Ark shells possess a primitive form of hemoglobin containing red blood cells, which is unusual for bivalves and gives their soft tissue a reddish color.
Ecological Role
Acts as a filter feeder improving water quality, and provides habitat and attachment surfaces for various micro-organisms in hard-bottom marine communities.
Similar Species
Mossy Ark (Arca imbricata) which has a fuzzier periostracum and less distinct banding.
Beach Finding Tips
Look along high-tide shell lines on sandy and rocky Caribbean or Southeastern US beaches after storm events.