Sea urchin - Wikipedia Sea urchins or urchins ( ˈɜːrtʃɪnz ) are the class Echinoidea within the echinoderms
Echinoidea | INFORMATION | Animal Diversity Web - ADW There are approximately 940 species of echinoids distributed worldwide in marine habitats from the intertidal to 5000 meters deep Their fossil record is extensive due to their test (an internal skeleton), and dates back to the middle Ordovician period
Echinoidea - Digital Atlas of Ancient Life Echinoidea comes from the Greek word ‘echinos’ meaning “spiny” and includes the sea urchins, sand dollars, and heart urchins Echinoids are the sister taxa to holothuroidians within the Echinozoa clade
World Echinoidea Database - World Register of Marine Species Echinoids, or sea urchins (oursins [French], Seeigel [German], erizos de mar [Spanish]) constitute a group of exclusively marine invertebrates inhabiting the intertidal down to the deep-sea trenches They are characterized by a globose or flattened skeleton known as a test
What Are Echinoidea? Features, Life, Marine Role What Are Echinoidea? Echinoidea is a class within the phylum Echinodermata, encompassing familiar marine invertebrates such as sea urchins, sand dollars, and sea biscuits These animals are characterized by their radial symmetry, often exhibiting a five-part body plan, and a hard, spiny body
Echinoidea - an overview | ScienceDirect Topics Echinoidea is defined as a class within the phylum Echinodermata that includes marine animals such as sea urchins and sand dollars, characterized by their distinctive pentaradial symmetry and an endoskeleton made of calcium carbonate
What is a unique feature of Echinoidea? - The Institute for . . . The most distinctive and unique feature of Echinoidea, also known as sea urchins and sand dollars, is their specialized feeding apparatus: the Aristotle’s Lantern, a complex, five-toothed chewing structure
Sea urchin | Description, Anatomy, Facts | Britannica Sea urchin, any of about 950 living species of spiny marine invertebrate animals (class Echinoidea, phylum Echinodermata) with a globular body and a radial arrangement of organs, shown by five bands of pores running from mouth to anus over the test (internal skeleton)