Ctenophora
Ctenophora
Ctenophora (pronounced: /tɪˈnɒfərə/), commonly known as comb jellies, is a phylum of invertebrate animals that live in marine environments worldwide. They are notable for their unique feature of 'combs', or groups of cilia that they use for swimming, and are the largest animals that swim by means of cilia.
Etymology
The term "Ctenophora" comes from the Greek words "κτείς" (kteis) meaning "comb" and "φέρω" (phero) meaning "to carry". This refers to the rows of cilia, known as 'combs', that the animals possess.
Anatomy
Ctenophores are characterized by their gelatinous bodies and the presence of ciliary combs, which are used for locomotion. They have a simple body plan that includes an oral (mouth) end and an aboral (opposite the mouth) end. The body contains an internal cavity known as the gastrovascular cavity, which functions in both digestion and circulation.
Classification
Ctenophores are classified within the phylum Ctenophora. There are approximately 100-150 known species, divided among two classes: Tentaculata, which have tentacles, and Nuda, which do not have tentacles.
Related Terms
- Cilia: Tiny hair-like structures present on the surface of all mammalian cells. They are also present in Ctenophores, arranged in comb rows, which they use for swimming.
- Invertebrate: Animals that do not have a backbone. Ctenophores are invertebrates.
- Marine biology: The study of organisms in the ocean or other marine bodies of water. As Ctenophora are marine creatures, they are a subject of study in marine biology.
- Phylum: A level of classification or taxonomic rank below Kingdom and above Class. Ctenophora is a phylum within the animal kingdom.
External links
- Medical encyclopedia article on Ctenophora
- Wikipedia's article - Ctenophora
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