• (n. pl.) Alt. of Asiphonida
Asiphonata or Asiphonida is an order of lamellibranchiate, bivalve molluscs, destitute of the siphon or tube through which, in the Siphonata, the water that enters the gills is passed outwards. It includes the oysters, the scallop-shells, the pearl-oyster, the mussels, and in general the most useful and valuable molluscs.