scallop southern queen scallop Zygochlamys delicatula A small pectinid species is distributed on the outer continental shelf along the east coast of the South Island, from Kaikoura down to Macquarie Island. There are nine other species in the genus, none of which have attracted commercial interest, probably because of their small size. chlamys delicatula gem scallop gem shellfish southern fan scallop tipa zygochlamys delicatula requires discussion