According to the World Register of Marine Species, the Pectinoidea include these families (all taxa marked † are extinct): •
Cyclochlamydidae •
Entoliidae •
Neitheidae † •
Pectinidae (scallops) •
Pleuronectitidae † •
Propeamussiidae some are known as glass scallops •
Spondylidae thorny oysters •
Tosapectinidae † ;Families brought into synonymy: • Propeamussidae: synonym of Propeamussiidae • Syncyclonematidae: synonym of Entoliidae ==References==