Ordovician to recent

Phylum: Mollusca
Class: Bivalvia
Order: Ostreoida
Family: Pectinidae

Ribs
Growth lines
Characteristic 'fan' shape (Pecten only)

Original shell material

Pecten can escape attention predators by swimming away. They can swim in short bursts by clapping their two valves together quickly.

They live a nektobenthic lifestyle: sitting on the seafloor for the majority of the time, swimming to escape danger.

Watch a Pecten maximus swim: Video