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Articulata |
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Articulata [är‚tik·yə′läd·ə] (invertebrate zoology) A class of the Brachiopoda having hinged valves that usually bear teeth. The only surviving subclass of the echinoderm class Crinoidea. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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In the Articulata we can commence a series with an optic nerve merely coated with pigment, and without any other mechanism; and from this low stage, numerous gradations of structure, branching off in two fundamentally different lines, can be shown to exist, until we reach a moderately high stage of perfection. |
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