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Summary phylogenetic hypothesis of the Echinodermata, based on David and Mooi (1997), Littlewood et al. (1997), and Sumrall and Sprinkle (1997). Note that the phylogenetic position of most fossil echinoderms is still uncertain, and a number of additional extinct taxa will be added to this tree in the future.
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tolweb.org/Echinodermata
tolweb.org/Echinodermata
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A nyone who has been to the beach has probably seen starfish or sand dollars. The more intrepid beachcomber may find brittle stars, sea cucumbers, or sea urchins. ... These and many other organisms, living and extinct, make up the Echinodermata, the largest phylum to lack any freshwater or land representatives.
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www.ucmp.berkeley.edu/echinodermata/echinodermata.html
www.ucmp.berkeley.edu/echinodermata/echinodermata.html
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Echinoderms have been compared to living, moving castles. Castles are made of interlocking blocks, with a single main entrance and numerous slit windows for air and for defense. Echinoderm skeletons are made up of ... Source: Hyman, L. H. 1955. The Invertebrates. Volume IV: Echinodermata. McGraw-Hill, New York.
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www.ucmp.berkeley.edu/echinodermata/echinomm.html
www.ucmp.berkeley.edu/echinodermata/echinomm.html
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Echinodermata has approximately 7000 described living species and about 13,000 extinct species known from the fossil record. This phylum is the largest without any freshwater or terrestrial forms. (Brusca and Brusca, 2003;
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animaldiversity.ummz.umich.edu/site/accounts/informatio...
animaldiversity.ummz.umich.edu/site/accounts/information/Echinodermata.html
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Echinodermata includes the starfish, sea urchins, brittle stars, sea cucumbers and feather stars. Just like the name says they have spines or spicules on their skins to a varying degree in the different groups. ... The usually have a radial symmetry with no anterior or posterior, but radiating out from a central point.
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library.thinkquest.org/26153/marine/enchino.htm
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Classification of Echinoderms ... Things To Know About Echinoderms ... Phylum Echinodermata - echinoderms...
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www.bio200.buffalo.edu/labs/echinoderms.html
www.bio200.buffalo.edu/labs/echinoderms.html
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An introduction to the biology, classification and ecology of Sea-cucmbers, Sea-stars, Sea-urchins and Starfish of the phylum Echinodermata ... Characteristics of Echinodermata:-; 1)Possess 5-rayed symmetry, mostly radial, sometimes bilateral. 2)Body has more than two cell layers, tissues and organs. 3)Body cavity a...
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www.earthlife.net/inverts/echinodermata.html
www.earthlife.net/inverts/echinodermata.html
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Sea and Sky's Echinoderms page 1 contains information about the cushion star, sunflower starfish, pacific starfish, orange starfish, and short-spined starfish. ... The echinoderms are a group of animals that includes starfish, urchins, feather stars, and sea cucumbers. They are simple Although a sea urchin looks round,
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www.seasky.org/reeflife/sea2d.html
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Members of the phylum Echinodermata are exclusively marine and most of them are bottom dwellers. The most striking characteristic of most species of this group is the pentamerous radial symmetry. This symmetry, however, has been secondarily derived from a bilateral ancestral form and is lost in some recent species.
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nlbif.eti.uva.nl/bis/echinodermata.php
nlbif.eti.uva.nl/bis/echinodermata.php
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