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The name echinoderm is from Ancient Greek ἐχῖνος (ekhînos) 'hedgehog' and δέρμα (dérma) 'skin'. [5] Echinoderms are bilaterians , meaning that their ancestors were mirror-symmetric. Among the bilaterians, they belong to the deuterostome division, meaning that the blastopore , the first opening to form during embryo development ...
Ctenocystoidea is an extinct clade of echinoderms, which lived during the Cambrian and Ordovician periods. Unlike other echinoderms, ctenocystoids had bilateral symmetry, or were only very slightly asymmetrical. They are believed to be one of the earliest-diverging branches of echinoderms, with their bilateral symmetry a trait shared with other ...
This list of prehistoric echinoderms is an attempt to create a comprehensive listing of all genera that have ever been included in the Echinoderms that have been preserved as fossils. This list excludes purely vernacular terms. It includes all commonly accepted genera, but also genera that are now considered invalid, doubtful ( nomina dubia ...
Hemichordata (/ ˌhɛmɪkɔːrˈdeɪtə / HEM-ih-kor-DAY-tə) is a phylum which consists of triploblastic, eucoelomate, and bilaterally symmetrical marine deuterostome animals, generally considered the sister group of the echinoderms. They appear in the Lower or Middle Cambrian and include two main classes: Enteropneusta (acorn worms), and ...
Helicoplacus. Helicoplacus (often misspelled Helioplacus) is the earliest well-studied fossil echinoderm. Fossil plates are known from several regions. Complete specimens were found in Lower Cambrian strata of the White Mountains of California. The animal was a cigar-shaped creature up to 7 centimetres (2.8 in) long that stood upright on one end.
Sea urchins, by Nick Hobgood (edited by Lycaon) Echinaster sepositus, by Poco a poco. Sphaerechinus granularis, by Poco a poco. Luidia senegalensis, by Andrea Westmoreland. Acanthaster brevispinus, by Matt Kieffer (edited by Cangadoba and Archaeodontosaurus) Anatomical diagram of a starfish, by Hans Hillewaert (edited by Slashme) Eucidaris ...
S. List of prehistoric sea cucumbers. List of prehistoric starfish genera. List of prehistoric stylophoran genera. Categories: Prehistoric echinoderms. Lists of prehistoric animals. Lists of echinoderms.
Category. : Echinoderms. Wikimedia Commons has media related to Echinodermata. Echinoderms (sea urchins, sea lilies, sea stars, crinoids, ...) are animals in the phylum Echinodermata. There are 5 subphyla, some of them being extinct: †Homalozoa, Crinozoa, Asterozoa, Echinozoa and †Blastozoa.
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