Pinnidae

Pinnidae is a family of marine bivalves known as pen shells. Its members have long, triangular shells and typically anchor upright in sediment using a byssus.

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Bivalvia: Bivalvia is a class of mollusks whose bodies are enclosed by two hinged shell valves. Pen shells are bivalves, sharing the paired-valve body plan.
Atrina: Atrina is a genus of pen shells with large, fan-shaped shells and species found in tropical and temperate seas. Its species show how Pinnidae’s upright, byssus-anchored body plan appears in a major genus.
Pinna nobilis: Pinna nobilis, the noble pen shell, is a large Mediterranean bivalve and the largest pen-shell species. This iconic species illustrates the family’s ecological and conservation significance.
Atrina fragilis: Atrina fragilis is a pen-shell species native to the northeastern Atlantic and parts of the Mediterranean. It provides a European example distinct from the Mediterranean noble pen shell.
Byssus: A byssus is a bundle of strong protein fibers that attaches certain bivalves to surfaces or sediment. Pen shells use byssal threads to anchor in sediment.
Pinna: Pinna is a genus of large pen shells, including species that live partly buried in soft seabeds. It is the genus behind the family’s common name, pen shells.
Pinnidae conservation: Pinnidae conservation concerns the protection of pen-shell species and the habitats and populations they depend on. Disease outbreaks and habitat pressures have made conservation central to the study of some pen shells.
Pinna rudis: Pinna rudis is a large pen-shell species found in the eastern Atlantic and Mediterranean region. Its broad distribution shows that Pinnidae extends beyond a single sea basin.
Pteriomorphia: Pteriomorphia is a major group of bivalves that includes scallops, oysters, mussels, and pen shells. Pinnidae belongs to this broad evolutionary group of mostly marine bivalves.
Molluscan mantle: The mantle is a tissue layer in mollusks that secretes the shell and often forms a cavity around the body. Mantle tissue produces the valves that protect a pen shell’s soft body.