Echinoderm

Parastichopus parvimensis

About P.parvimensis

The Warty Sea Cucumber (Parastichopus parvimensis) is a Sea Cucumber that can be found from the Gulf of Alaska to southern California. It is found from the low intertidal zone to a depth of 250 m. They are most abundant in areas with moderate current with cobbles, boulders or bedrock.

Amphiura filiformis

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One of the particular advantages of the sea urchin as an experimental system lies in the well defined phylogeny that surrounds it. A deep and diverse fossil record and extensive biochemical studies together establish confident divergence times for many points in the phylogenetic tree for echinoderms (see figure). Sea urchins have diverged from the reference species at intervals covering 265 million years. Sea stars, hemichordates and the chordate branch to which humans belong diverged earlier.

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Ophiothrix spiculata

The Spiny Brittle star, Ophiothrix spiculata Le Conte, 1851, is a member of the Ophiuroidea another of the five classes of echinoderms. Brittle stars have a central disk that is clearly separated from long flexible arms often covered with spines. O. spiculata ranges from Moss Beach, California to Peru including the Galapagos Islands. It lives from the low rocky intertidal, under rocks, in crevices, and in algal holdfasts to subtidal depths of ~2,000 meters. Little is known about reproduction but spawning has been noted in July at Pacific Grove, California.

Eucidaris tribuloides

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Lytechinus variegatus

About L.variegatus

Lytechinus variegatus Lamarck, 1816 is known as the green sea urchin or variegated sea urchin. It has many color morphs including white, green, purple, red, or pink or a combination of those colors. There are multiple subspecies for this species and the distribution details are in flux.

Patiria miniata

About P.miniata

Patiria miniata (Brandt, 1835) is commonly called the Bat star. It ranges from Sitka, Alaska to Baja, California. Its habitat is the low rocky intertidal and in the subtidal to 290m. P. miniata reproduces by broadcast spawning. Gravid individuals can be found throughout the year in California.

Strongylocentrotus purpuratus

About S.purpuratus