two-hinged shell organisms including clams, mussels, oysters, scallops

tiny invertebrates that live in the spaces between sediment particles

flattened bodies covered by eight shell plates (Class Polyplacophora)

tubular structures in bivalve for moving water into and out of animal’s body

tissue found in molluscs responsible for forming shell

dark fluid produced by the ink gland of octopus, cuttlefish, and squid

muscle responsible for closing the two valves of a bivalve shell

opening to a gastropod shell

mollusk members called “head foot”, includes octopus, squid, and cuttlefish

tube-like structure used by ribbon worms to capture prey

small bristles in the skin of annelids for locomotion, anchorage, or protection

mollusk members called “stomach foot”, includes snails, limpets, whelks

evolutionary process whereby sense organs become concentrated in the head

pair of structures near bivalve’s mouth that move food into digestive system

partitions that separate the chambers of a nautilus shell

area around the hinge and oldest part of a bivalve shell

sac-like structure that stores food in annelids and birds

tough protein threads secreted by mussels to attach to surface

phyla of animals that includes snails, clams, octopus, and squid

brown-black pigment

muscular tube behind mouth that is part of digestive system in Planaria

structure in gastropods for closing their aperture

ribbon of tissue in molluscs with teeth for scraping, piercing, or tearing food