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Echinoderms (Phylum Echinodermata) are a phylum of marine animals. Echinoderms are found at every ocean depth, from the intertidal zone to the abyssal zone. Aside from the problematic Arkarua, the first definitive members of the phylum appeared near the start of the Cambrian period. The phylum contains about 7,000 living species, making it the second-largest grouping of deuterostomes, after the chordates; they are also the largest phylum that has no freshwater or terrestrial representatives. The word is derived from the Greek ἐχινοδέρματα (echinodermata), plural of ἐχινόδερμα (echinoderma), "spiny skin" from ἐχινός (echinos), "sea-urchin", originally "hedgehog," and δέρμα (derma), "skin". The echinoderms are important both biologically and geologically: biologically because few other groupings are so abundant in the biotic desert of the deep sea, as well as the shallower oceans, and geologically as their ossified skeletons are major contributors to many limestone formations, and can provide valuable clues as to the geological environment. Further, it is held by some that the radiation of echinoderms was responsible for the Mesozoic revolution of marine life. From Wikipedia under the
GNU Free Documentation License What are the similarities and differences of Echinodermata and Arthropoda? Q. mention of symmetry, body cavity, digestive tract, development, and circulatory system. Asked by Clever - Thu Apr 15 17:42:32 2010 - - 1 Answers - 0 Comments A. Echinoderms: 5-rayed symmetry, mostly radial. Most possess a through gut with an anus. Highly variable body shape, no head. Open circulatory system, though poorly defined. No excretory organs. Live in marine environments. Arthropods: Live in every possible habitat. Jointed external skeleton. Pairs of jointed appendages. Bilateral symmetry. Hope this helps! Answered by unknown - Thu Apr 15 17:59:15 2010 Which of the following animal groups includes terrestrial life forms-mollusca or Echinodermata? Q. Thank you. Asked by Sweety01 - Mon Mar 24 19:38:10 2008 - - 2 Answers - 0 Comments A. Mollusca. We have snails and slugs that live on land. They are mollusks. Answered by Amy Z - Mon Mar 24 19:41:22 2008 What is the literal meaning of the word echinodermata...i know the definition but i need the literal meaning?
Q. i need the literal meaning of the word itself not its defnition Asked by tibbies10 - Tue May 20 22:02:48 2008 - - 2 Answers - 0 Comments A. Echino = bones/spines Derm = skin -ata indicates a phylum So this is a phylum where its skin is bony/spiny Answered by Brad Feng - Tue May 20 22:07:47 2008 From Yahoo Answer Search: "Echinodermata"
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 news.google.com Wrightsville Beach Magazine Belonging to the phylum Echinodermata , to the class Echinoidea and to the order Clypeastroida, sand dollars are closely related to sea urchins and sea stars ... news.google.com Deep-Sea News (blog) Ameziane, N. & Roux, M. 1997 Biodiversity and historical biogeography of stalked crinoids ( Echinodermata ) in the deep sea. Biodiversity and Conservation 6, ... From Google News Search: "Echinodermata"  biochemicalsoul.com 366px x 550px | 154.20kB [source page] echinoderms are the asteroids starfish sea stars ophiuroids brittle stars echinoids sea urchins holothuroids sea cucumbers and crinoids feather stars sea lillies and such Click for larger Or Click HERE for super high resolution posters That s right folks I am now at least an honorary marine biologist kind of I don t know if the real marine  ucmp.berkeley.edu 399px x 502px | 92.10kB [source page] Almost all Echinoderms are bottom dwellers From Yahoo Image Search: "Echinodermata"  dungbeetle.vox.com Echinodermata Wed, 22 Jul 2009 16:39:53 GM 0_IMAGE_158.jpeg. Whoa... isn't it supposed to be summer? This is why I'm sick. I hope everyone else has good weather in their area! Read and post comments | Send to a friend. From Google Blog Search: "Echinodermata" |
California Academy of Sciences Echinoderm Webpage
Echinoderm Envenomations
Echinoderm Portal
