Sea Urchin - View from Above

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Amphidotus cordatus or Echinocardium cordatum, commonly called a sea urchin, viewed from above. a, anterior ambulacrum, forming with b, b, anterolateral ambulacra, the trivium; c, c, two posterolateral ambulacra, forming the bivium; d, madreporic tubercle surrounded by genital pores; e, intrapetalous semita or fasciole; f, circumanal semita.” —Whitney, 1889

Keywords

sea urchin, urchin, hedgehog, pores, Echinocardium cordatum, amphidotus cordatus, bivium, globular animal, sea hedgehogs, trivium

Galleries

Sea Urchins and Sea Stars

Source

William Dwight Whitney, PhD, LLD The Century Dictionary: An Encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1895) 5800

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