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Echinoidea    
海胆纲

海胆纲

Echinoidea
n 1: sea urchins and sand dollars [synonym: {Echinoidea}, {class
Echinoidea}]


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  • Sea urchin - Wikipedia
    Sea urchins or urchins ( ˈ ɜːr tʃ ɪ n z ) are echinoderms in the class Echinoidea About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal zone to deep seas of 5,000 m (16,000 ft) [ 1 ]
  • 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)
  • ADW: Echinoidea: INFORMATION
    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
    Echinoids are the sister taxa to holothuroidians within the Echinozoa clade Like other extant echinoderms, species in this mobile class primarily exhibit pentaradial symmetry—some have evolved bilateral symmetry—and use a water vascular system for movement and food capture
  • Echinoidea Profile: Facts About the Class Echinoidea - ThoughtCo
    The Class Echinoidea contains some familiar marine creatures - sea urchins and sand dollars, along with heart urchins These animals are echinoderms, so they are related to sea stars (starfish) and sea cucumbers
  • Introduction to the Echinoidea - University of California . . .
    Introduction to the Echinoidea Left: A long-spined sea urchins on a coral reef at Contadora Island, off the Pacific Coast of Panama Center: Unidentified sand dollar skeleton with spines removed Right: Living heart urchin, Brissus laticarinatus, from the eastern coast of Thailand
  • Echinoidea - an overview | ScienceDirect Topics
    Echinoderms (Phylum Echinodermata) are a diverse, exclusively marine group of invertebrates that consists of over 13,000 extinct species (15 classes) and 7,000 extant described species within five classes (Asteroidea, Echinoidea, Holothuroidea, Ophiuroidea and Crinoidea) Echinoderms are ubiquitous within the marine environment, and members of





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