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Pisaster
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Pisaster is a genus of Pacific sea stars that includes three species, P. brevispinus, P. giganteus, and P. ochraceus. Their range extends along the Pacific coast from Alaska to southern California in the intertidal zone. The largest individuals of Pisaster can reach diameters of up to 70 cm (28 in) across; they all develop five arms, but some may be lost from injury or disease, and occasionally the re-growth of an injured arm will result in an individual with more than five arms.

Sea stars in the genus Pisaster are all predators; the ochre sea star is the best-characterized of these, and is considered a "keystone" predator that controls the relative abundance of many other species in the ecosystem.

Species

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Pisaster: Brief Summary
provided by wikipedia EN

 src= Ochre Sea Star at low tide, Saltspring Island, British Columbia

Pisaster is a genus of Pacific sea stars that includes three species, P. brevispinus, P. giganteus, and P. ochraceus. Their range extends along the Pacific coast from Alaska to southern California in the intertidal zone. The largest individuals of Pisaster can reach diameters of up to 70 cm (28 in) across; they all develop five arms, but some may be lost from injury or disease, and occasionally the re-growth of an injured arm will result in an individual with more than five arms.

Sea stars in the genus Pisaster are all predators; the ochre sea star is the best-characterized of these, and is considered a "keystone" predator that controls the relative abundance of many other species in the ecosystem.

license
cc-by-sa-3.0
copyright
Wikipedia authors and editors
original
visit source
partner site
wikipedia EN
ID
24ffff9a5c2ccc2ad3ff32bd782168c8