Stephanasterias

Stephanasterias albula is a species of starfish in the family Asteriidae. It is the only species in its genus, Stephanasterias, which was described by Verrill in 1871. It has a circumboreal distribution and is found in the north west Atlantic Ocean, the north east Pacific Ocean, the Barents Sea and European waters.[2] It usually has eight arms and is white with a rough upper surface. It has been trawled from depths of 267 metres.[3]

Stephanasterias albula
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Asteroidea
Order:	Forcipulatida
Family:	Asteriidae
Genus:	Stephanasterias Verrill, 1871 [1]
Species:	S. albula
Binomial name
Stephanasterias albula (Stimpson, 1853) [2]
Synonyms[2]
Asteracanthion albulus Stimpson, 1853 Asteracanthion problema Steenstrup, 1854 Asterias albulua Stimpson, 1864 Asterias gracilis Perrier, 1881 Asterias problema Lutken, 1872 Nanaster albulus Perrier, 1894 Stephanasterias gracilis (Perrier, 1881) Stichaster albulus (Stimpson, 1853)

Biology

S. albula is an omnivore, predator and scavenger.[2] Reproduction is by fission. A crack develops across the disc and the animal divides into two halves. New arms develop on the injured surfaces. A lack of any juvenile or young specimens found leads to the view that there is no larval recruitment and that this species is one of very few sea star species that reproduces primarily by dividing.[4]

References

1. Stephanasterias Verrill, 1871 World Register of Marine Species. Retrieved 2011-09-30.
2. Stephanasterias albula (Stimpson, 1853) World Register of Marine Species. Retrieved 2011-09-27.
3. Stephanasterias albula (Stimpson, 1853) Retrieved 2011-09-27.
4. Mladenov, Philip V.; Sally F. Carson; Charles W. Walker (1986). "Reproductive ecology of an obligately fissiparous population of the sea star Stephanasterias albula Stimpson". Journal of Experimental Marine Biology and Ecology. 96 (2): 155–75. doi:10.1016/0022-0981(86)90240-6.