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SQUID, CUTTLEFISH, OCTOPUS (Cephalopoda)
Biodiversity > Marine Life > Molluscs > Squid, cuttlefish, octopus

Squid, Cuttlefish and Octopus (Class Cephalopoda) are the most highly evolved molluscs and are probably the most intelligent invertebrates. The head is partially or fully fused with the foot, which is usually modified into 8 or 10 arms and tentacles around the mouth, each having suckers or hooks. These suction discs are used to catch fish and invertebrates, and the parrot-like beak and radula are used to eat the flesh. The shell is greatly reduced or absent, except in the tropical Nautilus, which is also unusual in possessing tentacles that lack suckers. Cephalopods have a well-developed brain and nervous system and complex sensory organs that allow them to respond rapidly to their environment. The eyes of most species are particularly well developed and allow colour vision.

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