Ophidiaster granifer
From Wikipedia, the free encyclopedia
| Ophidiaster granifer | |
|---|---|
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Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Asteroidea |
| Order: | Valvatida |
| Family: | Ophidiasteridae |
| Genus: | Ophidiaster |
| Species: | O. granifer |
| Binomial name | |
| Ophidiaster granifer | |
| Synonyms[1] | |
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Ophidiaster granifer, the grained seastar, is a species of starfish in the family Ophidiasteridae. It is found in the Red Sea and the Indo-Pacific and is the only known species of starfish to reproduce by parthenogenesis.
Biology
No male Ophidiaster granifer has ever been identified and all known adults are female.[4] As far as is known, Ophidiaster granifer is the only member of the phylum Echinodermata to reproduce exclusively by parthenogenesis. In this species, eggs are liberated into the sea in a synchronous spawning event but no fertilisation takes place. The eggs are large, with a diameter of 0.6 millimetres (0.024 in) and the mother attaches some of them to the underside of boulders. Here they develop until they undergo metamorphosis into juvenile starfish. Other eggs are planktonic and drift with the currents. In either case, the larvae are lecithotrophic and feed off the yolks of their eggs. This reproductive strategy may be linked to the starfish's low fecundity rate and its low population density.[4]