Velatida
The Velatida are an order of sea stars containing about 200 species in five families. These sea stars normally have thick bodies with large discs.
Species
マクヒトデ目
ORDER
- KingdomAnimalia
- PhylumEchinodermata
- ClassAsteroidea
- OrderVelatida
Habitatmarine
De Velatida zijn een orde van de zeesterren (klasse Asteroidea). De orde telt vier families. Families Caymanostellidae Belyaev, 1974 Korethrasteridae Danielssen & Koren, 1884 Myxasteridae Perrier, 1885 Pterasteridae Perrier, 1875 Peribolaster sp. (Korethrasteridae) Myxaster sp. (Myxasteridae) Hymenaster sp. (Pterasteridae) Afbeeldingen Pythonaster sp. Hymenaster sp.
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Article
3 sectionsContents
- Description and characteristics
- Taxonomy
- References
The Velatida are an order of sea stars containing about 200 species in five families. These sea stars normally have thick bodies with large discs.
== Description and characteristics == This order contains mostly deep or cold seas sea stars, often with a wide distribution (sometimes global). They have a pentagonal or star shape, with between 5 and 15 arms. Their skeleton is weakly developed, which confers them a good flexibility, and numerous papillae on the aboral surface allow them to breathe in poorly oxygenated waters. Their pedicellariae are often provided with spines. The smallest are Caymanostellidae (between 0,5 and 3 cm) and the biggest Pterasteridae (up to 30 cm).