Asteroidea
Asteroidea (pronounced: as-ter-oy-dea) is a class of echinoderms commonly known as sea stars or starfish. The name "Asteroidea" comes from the Greek words "aster" meaning star, and "eidos" meaning form or shape.
Etymology
The term "Asteroidea" is derived from two Greek words, "aster" which means star, and "eidos" which means form or shape. This is in reference to the star-like shape of these creatures.
Description
Asteroidea are characterized by their radial symmetry, usually with five arms, although some species have more. They have a central disc and multiple radiating arms. The underside of these arms contains tube feet with suction capabilities that they use for locomotion and catching prey.
Habitat and Distribution
Asteroidea are found in every ocean and in a variety of habitats, from tidal pools to the deep sea. They are most commonly found in rocky areas, especially on coral reefs.
Diet
Most species of Asteroidea are carnivores, feeding on mollusks such as clams and oysters. They have a unique feeding mechanism in which they can extend their stomachs out of their bodies and into their prey.
Reproduction
Asteroidea reproduce both sexually and asexually. In sexual reproduction, they release eggs and sperm into the water where fertilization occurs. Some species also have the ability to regenerate lost arms, and in some cases, a new individual can grow from a single lost arm.
Related Terms
- Echinoderm: The phylum that includes Asteroidea.
- Tube feet: Small, suction-cup like appendages used by Asteroidea for movement and feeding.
- Carnivore: An organism that primarily eats other animals.
External links
- Medical encyclopedia article on Asteroidea
- Wikipedia's article - Asteroidea
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