The Pinnidae are a taxonomic family of large saltwater clams sometimes known as pen shells. They are marine bivalve molluscs in the order Pteriida. The shells of bivalves in this family are …

The pen shell (Atrina rigida) has two thin-walled, fan-shaped shells and is one of the largest bivalves (two shells) in the world, reaching lengths up to 10 inches (250 millimeters).

A large, brown fan-shaped bivalve that anchors itself down into the sand with an enormous tuft of silk byssus threads. Historians suggest that the “Golden Fleece” was made from Pen Shell silk.

Nov 12, 2025 · When you visit the beaches of Sanibel and Captiva, you will inevitably be greeted by an abundance of pen shells littered throughout the wrack line. Two species of these …

Dec 19, 2025 · mollusk, any soft-bodied invertebrate of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.

Pinnidae, the pen shells, have thin, fan-shaped, translucent shells. The outer shell may have radial ribs and or small scales or spines. The inside has a shiny, iridescent part called the …

Pinna bicolor, also known as bicolor pen shell, razorfish, razor clam, or pen shell, is a species of large saltwater clam in the family Pinnidae. It is commonly found in shallow waters up to 50 m …

Atrina rigida, commonly called the rigid pen shell, is a species of bivalve mollusc in the family Pinnidae. The rigid shell has a pair of thick spiny valves held together by ligaments that run …

Pinna carnea, commonly called the amber pen shell, is a species of bivalve mollusc in the family Pinnidae. The amber pen shell has a pair of long, thin translucent valves held together by …

Natural Abalone Sea Shell Inlay with Pure Platinum Plating. Handcrafted, Limited Edition, Serialized. Need help?