AP BIOLOGY

CLASSIFICATION

NINE COMMON ANIMAL PHYLA

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which animal phylum do octopus and squid belong to?
A
mollusca
B
cnidaria
C
platyhelminths
D
annelida
Explanation: 

Detailed explanation-1: -Class Cephalopoda. The cephalopods are molluscs with large heads and tentacles. Examples of cephalopod molluscs include squid, octopus, cuttlefish, and nautilus (Fig. 3.65).

Detailed explanation-2: -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-3: -The octopus is an aquatic animal which has eight-limbed molluscs of the order Octopoda. They belong to the phylum Mollusca. It is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids.

Detailed explanation-4: -Squid, snails, and shellfish belong to a group of invertebrates called molluscs. These creatures have soft bodies and a muscular “foot” which they use to move around. All molluscs have a mantle, which is a skin-like body organ that covers most of their other organs.

Detailed explanation-5: -Snails and Slugs: Phylum Mollusca, Class Gastropoda.

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