Velatida
In the following article, we will explore the impact of Velatida on contemporary society and how it has evolved over the years. Since its emergence, Velatida has sparked constant debate in different areas, generating both admiration and controversy. Through detailed analysis, we will examine the different aspects surrounding Velatida, from its relevance in popular culture to its influence on current trends. Likewise, we will investigate the various opinions and perspectives that exist around Velatida, with the aim of offering a complete and enriching panorama.
| Velatida | |
|---|---|
| |
| Pteraster capensis | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Asteroidea |
| Order: | Velatida Perrier, 1884 |
| Families | |
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5, see text | |
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).
Taxonomy
New molecular evidence now suggests a relationship between some velatid and valvatid families.
List of families according to World Register of Marine Species:
- Caymanostellidae Belyaev, 1974
- Korethrasteridae Danielssen & Koren, 1884
- Myxasteridae Perrier, 1885
- Pterasteridae Perrier, 1875
- †Tropidasteridae Wright, 1880
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-
Myxaster sp., Myxasteridae -
Hymenaster sp., Pterasteridae
References
- ^ "Asterozoa: Fossil groups: SciComms 05-06: Earth Sciences". Palaeo.gly.bris.ac.uk. 2005-11-22. Retrieved 2010-07-30.
- ^ Mah, Christopher L. "Velatida". www.accessscience.com.
- ^ "The World Asteroidea Database - Velatida". Marinespecies.org. Retrieved 2010-07-30.
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