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 cephalopods are a diverse class of mollusks (a group that also includes snails and bivalves) that emerged during an explosion of animal diversity in the oceans during the Cambrian period, over 500 million years ago (mya). Today, scientists divide the living cephalopods into three groups, called superorders.

Detailed explanation-3: -The phylum Mollusca includes a wide variety of animals including the gastropods (“stomach foot”), the cephalopods (“head foot”), and the scaphopods (“boat foot”).

Detailed explanation-4: -A cephalopod is an animal belonging to the group Cephalopoda, containing octopus, squid, cuttlefish, nautilus, and kin. The word “cephalopod” is derived from Greek and means “head foot, ” which perfectly describes animals that have eyes just above their many limbs.