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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 derives from the Greek εχινοδέρματα (echinodermata), plural of εχινόδερμα (echinoderma), "spiny skin" and that from εχινός (echinos), "sea-urchin", originally "hedgehog" + 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. Two main subdivisions of Echinoderms are traditionally recognised: the more familiar, motile Eleutherozoa, which encompasses the Asteroidea (starfish), Ophiuroidea (brittle stars), Echinoidea (sea urchins and sand dollars) and Holothuroidea (sea cucumbers); and the sessile Pelmatazoa, which consists of the crinoids and extinct Paracrinoids. Some crinoids, the feather stars, have secondarily re-evolved a free-living lifestyle. A fifth class of Eleutherozoa consisting of just two species, the Concentricycloidea (sea daisies), were recently merged into the Asteroidea. The fossil record contains a host of other classes which do not appear to fall into any extant crown group. From Wikipedia under the
GNU Free Documentation License Which of the nine major phyla have intracellular and which have extracellular digestion? Q. Btw the nine major phyla are Porifera, Cnidaria, Chordata, Mollusca, Arthropoda, Nematoda, Annelida, Platyhelminthes, and Echinodermata Asked by bbbaseball2 - Sun Sep 16 19:22:08 2007 - - 1 Answers - 0 Comments A. Porifera, Cnidaria, Chordata, Mollusca, Arthropoda, Nematoda, Annelida, Platyhelminthes, and Echinodermata Answered by ATP-Boy - Mon Sep 17 02:39:39 2007 IS there a website where i can get information on invertabrates? can someone give me info? Q. i need lots of facts on each phylum of invertabrates: Porifera, Cnidaria, Platyhelminthes, Nematoda, Annelida, Echinodermata, Mollusca, and Arthropoda. If any one has like useful facts on any of these phyla or a website with good info plz let me no! Asked by Diane - Sat May 2 16:13:37 2009 - - 1 Answers - 0 Comments A. try to check on this site it's help you Answered by black > > harp - Wed May 6 05:04:53 2009 Phyla order from Least to Most Complex?
Q. I need to put all the phylum in order from the least to most complex. These are the Phyla: -Echinodermata -Cnidaria -Platyhelminthes -Nematoda -Annelida -Arthropoda -Chordata -Mollusca If anyone could help me with this, it would be very appreciated! Asked by ranting_woman - Sat Aug 29 21:47:46 2009 - - 1 Answers - 0 Comments A. Most complex - Chordata, Arthropoda, Mollusca, Annelida, Nematoda, Platyhelminthes, Echinodermata Cnidaria Least complex This is a good guess - but may not be exact. Answered by Bryan - Sat Aug 29 22:00:01 2009 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"  e-dukasi.net 357px x 515px | 27.30kB [source page] Mengapa jenis hewan ini disebut Echinodermata Echinodermata berasal dari kata Yunani echinos artinya duri dan derma artinya kulit Jadi Echinodermata  homepage.uab.edu 406px x 640px | 31.40kB [source page] brachiolaria Growth of a Starfish Microscopy UK Ophiuroidea From Yahoo Image Search: "Echinodermata"  dungbeetle.vox.com Echinodermata hu, 20 Aug 2009 20:43:53 GM IMG00157-20090819-1055.jpeg. The Philippine coral reef exhibit at Cal Academy was pretty amazing except for the fact that it wasn't as big as I thought it would be. Read and post comments | Send to a friend. dungbeetle.vox.com Echinodermata Fri, 07 Aug 2009 18:32:17 GM Preparing for our Lake Tahoe trip by: going to the flea market to buy $20 suitcases. and helping fix my favorite person's bike. (we plan on biking a lot in tahoe!) My baby brother is also turning 18 this Saturday! I know he's taller a. ... dungbeetle.vox.com Echinodermata Fri, 03 Jul 2009 03:06:44 GM 0_IMAGE_145.jpeg. I love DVD Rental boxes! A dollar per rental! Totally beats Blockbuster's price which is around three something dollars. Only downside is they're only a 24 hour rental. I rented The Uninvited and He's Just Not Into You ... From Google Blog Search: "Echinodermata" |
Echinoderm Newsletter
California Academy of Sciences Echinoderm Webpage
