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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 .
Pisaster giganteus: Knobby sea star, giant spined star Pisaster ochraceus: Ocher sea star Pycnopodia helianthoides: Sunflower sea star Class Ophiuroidea, brittle stars
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.
The Kellet's whelk does not display an avoidance response in the presence of the sea star Pisaster giganteus. [1] The sea star is eating the bivalve Chama pellucida while three Kelletia kelletii are attempting to get to the prey. An avoidance response is a response that prevents an aversive stimulus from occurring. It is a kind of negative ...
Predators of Norrisia norrisii include sea otters, starfish such as Pisaster ochraceus and Pisaster giganteus, [15] California spiny lobster Panulirus interruptus, [16] and drilling mollusks such as octopus [12] [17] and moon snails.