(n.) Any large macrurous crustacean used as food, esp. those of the genus Homarus; as the American lobster (H. Americanus), and the European lobster (H. vulgaris). The Norwegian lobster (Nephrops Norvegicus) is similar in form. All these have a pair of large unequal claws. The spiny lobsters of more southern waters, belonging to Palinurus, Panulirus, and allied genera, have no large claws. The fresh-water crayfishes are sometimes called lobsters.

Chilopoda Chordata Dungeness crab Echiuroidea Ectoprocta Entoprocta Japanese crab Monoplacophora Nemertinea Phoronidea blue point clam coquillage crab crawdad crawfish crayfish gawk klutz langouste limpet littleneck clam looby lout lubber lug lummox lump mussel oaf oyster palooka periwinkle prawn quahog scallop shellfish shrimp snail soft-shell crab steamer whelk