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Phylogeny Echinoderms - Chordata

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ClassArticulata Phylum Echinodermata, "Brittle Stars", most diverse, smaller than starfish, no ambulacral groove, bursal sacs
SuperOrderEiphausiacea Phylum Arthropoda, Subphylum Crustacea, "Krill", marine, filter feeders, highest number in Anartica
ClassInsecta "Phorons" all marine, worm-like, U-shaped gut
ClassAscidiacea "Moss Animals", Colonial, sessiles, mostly marine, polymorphic zooids in colony, no circulatory, no excretory, no respiratory
ClassChilopoda "Arrow Worms", planktonic, active predators, hermaphroditic
ClassInarticulata Phylum Chordata, Subphylum Urochordata, "Sea Squirts", sessile, colonial marine
ClassOphiuroidea Phylum Bryozoa, all marine species, circular lophophore, polymorhpic, chitonious zooecium
PhylumBrachiopoda Phylum Echinodermata, "Sea Lilies", oldest, most primative group, sessile and deep water, ossicles form stalk
ClassHolothuroidea Subphylum Uniramia, segmented, uniramous appendages, terrestial and cryptics
ClassEchinoidea Phylum Arthropoda, Subphylum Uniramia, 750,000 species, spiracles for respiration, flight
ClassEnteropheusta Phylum Hemichordata, primative, worm-like, live in deep water in Sounthern Hemisphere
ClassCrinoidea Phylum Echinodermata, "Sea Cucumbers", greatly prolonged, 5 rows of tube feet, deposit feeders, internal madroporite
ClassDiplopoda Phylum Arthropoda, Subphylum Uniramia, "Millipedes", posses diplosegments and repugnantoral glands for defense
PhylumSipuncula "Peanut Worms", all benthic marine, detritous feeders, no gass echange or circulatory system,similar to Annelids
MyriapodousArthropods Phylum Bryozoa, non-polymorphic, all freshwater, U-shaped lophophore, gelatinous colony, most primative
PhylumPhoronia Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, mostly marine, well developed abdomen, 8 segments
ClassAsteroidea "Velvet Worms", very ancient group, living fossils, mostly tropical areas, internal segmentation
ClassPhylactolaemata Phylum Arthropoda, Subphylum Uniramia, "Centipedes", active predators, scretes poison with maxillpedes
ClassPterobranch "Spiny-Skinned", 3 compartment coelom, pentamerous radial symmetry, internal skeleton, water vascular system
PhylumEchinodermata Phylum Brachiopoda, incomplete digestive tract, CaCO3 shell, Terebratella
PhylumOnychophora Phylum Hemichordata, "Acorn Worms", live in mud flats and are deposit feeders
PhlyumChaetognatha Phylum Echinodermata, "Starfish", oral surface faces down,
ClassGymnodaemata Phylum Brachiopoda, valves held by muscles, complete digestive tract, CaPO4 shells, Lingula
OrderDecapoda Phylum Echinodermata, "Sea Urchins", globular shapes, fused ossicles, spines for defense
PhylumBryozoa "Lamp Shells", all marine, ancient group with 2 compartmental coelom

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