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Pisaster giganteus, the giant sea star, giant spined star, or knobby sea star is a species of sea star that lives along the western coast of North America from Southern California to British Columbia. It makes its home on rocky shores near the low tide mark. It preys on mollusks. It can grow as large as 24 in (61 cm) in diameter.
Pisaster (from Greek πίσος, "pea", and ἀστήρ, "star" [1]) 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.
Pisaster ochraceus, generally known as the purple sea star, ochre sea star, or ochre starfish, is a common seastar found among the waters of the Pacific Ocean. Identified as a keystone species , P. ochraceus is considered an important indicator for the health of the intertidal zone .
Starfish, such as the ochre sea star (Pisaster ochraceus) and the reef sea star (Stichaster australis), have become widely known as examples of the keystone species concept in ecology. The tropical crown-of-thorns starfish ( Acanthaster planci ) is a voracious predator of coral throughout the Indo-Pacific region, and the Northern Pacific ...
The madreporite's function in maintaining fluid has been experimentally tested on Pisaster ochraceus, wherein sea stars with blocked madreporites were unable to readjust their body volume after exposure to hyperosmotic conditions. [3]
P. giganteus may refer to: Pisaster giganteus , the giant sea star, a sea star species found along the western coast of North America Pteropus giganteus , the Indian flying-fox, a bat species found in Bangladesh, China, and India
The leg of this Pisaster ochraceus sea star in Oregon is disintegrating as a result of sea star wasting syndrome. Sea star wasting disease or starfish wasting syndrome is a disease of starfish and several other echinoderms that appears sporadically, causing mass mortality of those affected. [1]
Ambulacral is a term typically used in the context of anatomical parts of the phylum Echinodermata or class Asteroidea and Edrioasteroidea. [1] [2] Echinoderms can have ambulacral parts that include ossicles, plates, spines, and suckers.