GENERAL HISTOLOGY

Detailed explanation-1: -Cephalopods are a group of molluscs that include the pearly chambered Nautilus, squids, and the octopus. They can be divided into three categories: the Nautiloidea (chambered Nautilus), the Ammonoidea (the extinct ammonites), and the Dibranchiata (squids, the extinct belemnites, and octopuses).

Detailed explanation-2: -The phylum Mollusca is the second-largest animal phylum, with over 100, 000 species. The molluscs include many familiar animals, including clams, snails, slugs, and squid, as well as some less familiar animals, like tusk shells and chitons (Fig. 3.51 A).

Detailed explanation-3: -cephalopod, any member of the class Cephalopoda of the phylum Mollusca, a small group of highly advanced and organized, exclusively marine animals. The octopus, squid, cuttlefish, and chambered nautilus are familiar representatives.

Detailed explanation-4: -ark shell (family Arcidae) cockles (family Cardiidae) coquina clam (genus Donax) gaper clams (Tresus nuttallii and Tresus capax) geoduck (Panopea generosa) jingle shells (family Anomiidae) mussels (families Mytilidae and Unionidae) genus Nuculana. More items