Cephalopod
Cephalopod
Cephalopods (pronounced: /ˈsɛfələˌpɒd/, from the Greek words kephalē meaning "head" and pous meaning "foot") are a class of marine animals within the phylum Mollusca. They include species such as the octopus, squid, cuttlefish, and nautilus.
Etymology
The term "cephalopod" comes from the Greek kephalē, meaning "head", and pous, meaning "foot". This refers to the way the cephalopod's head is connected to its foot, which has been modified into a set of tentacles.
Characteristics
Cephalopods are characterized by bilateral body symmetry, a prominent head, and a set of tentacles or arms. They are known for their high intelligence compared to other invertebrates, with some species demonstrating complex behaviors such as problem-solving and tool use.
Most cephalopods are fast swimmers and many can change color and pattern, thanks to specialized cells in their skin called chromatophores. They also have well-developed senses, including advanced eyes similar to those of vertebrates.
Classification
Cephalopods are classified within the phylum Mollusca, which also includes other groups such as gastropods (snails and slugs), bivalves (clams, oysters, and scallops), and scaphopods (tusk shells). They are further divided into two subclasses: Coleoidea, which includes octopuses, squids, and cuttlefish, and Nautiloidea, which includes the nautilus.
Related Terms
- Mollusca: The phylum to which cephalopods belong.
- Octopus: A type of cephalopod known for its eight arms and high intelligence.
- Squid: A type of cephalopod known for its elongated body and ten arms.
- Cuttlefish: A type of cephalopod known for its unique internal shell, the cuttlebone.
- Nautilus: A type of cephalopod known for its external shell and primitive characteristics.
External links
- Medical encyclopedia article on Cephalopod
- Wikipedia's article - Cephalopod
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