The world's largest species of sea urchin is the giant red sea urchin (Mesocentrotus [=Strongylocentrotus] franciscanus). Native to shallow waters in the north-east Pacific Ocean …

Sea urchins are found in every ocean and in every climate, from the tropics to the polar regions, and inhabit marine benthic (sea bed) habitats, from rocky shores to hadal zone depths. The …

It is found on the seabed in the tropical eastern Pacific Ocean including Mexico, Panama, Ecuador and the Galápagos Islands. Tripneustes depressus is the largest sea urchin species …

The red sea urchin is the largest sea urchin in the class Echinoidea, which consists of about 940 species of sea urchins and sand dollars worldwide (Follo and Fautin 2001). The maximum size …

The red sea urchin is the largest of the sea urchins, with a maximum “test”, or outer skeleton, diameter of more than 18 cm and a maximum spine length of 8 cm. Their test is made up of 10 …

2025年1月11日 · Most sea urchins measure 3 to 10 cm (1 to 4 in) across their test, though the largest species, the red sea urchin (Mesocentrotus franciscanus), grows up to 18 cm (7 in) in …

They are the largest urchin species found on the Pa­cific North­west coast, with the largest recorded test di­am­e­ters ap­proach­ing 19 cm (7.5 in in the very old­est spec­i­mens. A test is …

Description: This is the largest urchin found in the Pacific Northwest. Color of spines varies--may be red, brick red, pink, purple, or even maroon. Spines up to 7 cm long. Up to 20 cm diameter …

As an echinoderm, the red sea urchin is in the marine invertebrate group along with sea stars, brittle stars, and sea cucumbers. This is the largest species of sea urchin, and can grow to be …

2023年8月10日 · The largest sea urchin is the giant red sea urchin (Mesocentrotus franciscanus), averaging more than 18 cm in diameter, while the smallest sea urchin is a sand dollar …