Classification of Echinoderms

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Information about Classification of Echinoderms

Published on October 7, 2013

Author: raniashok


PowerPoint Presentation: Classification of Echinoderms Mrs. Rani Ashok Asst. Prof. of Zoology Lady Doak College, Madurai – 2 Email: Phylum Echinodermata: Phylum Echinodermata Sub-phylum PELMETAZOA Mostly extinct Sedentary forms Pentamerous No tube feet Consists of 5 classes Sub-phylum ELEUTHEROZOA Mostly living Stalkless Pentamerous Oral side faces down Anus on aboral side Has tube feet Consists of 4 classes Sub-phylum PELMATAZOA: Sub-phylum PELMATAZOA Heterostelea Edrioasteroidea Blastoidea Cystodea Heterostelea Examples: Trochocystites Pentaremites Cryocinites Lepidodiscus Antedon Flexibilia Xenocrinus Extinct forms Extinct & Living forms Class Heterostelea: Non-porous theca Attached by stalk Eg : Trochocystites Class Heterostelea Class Blastoidea: Pentamerous theca Stemmed/ stemless Eg : Pentaremites Class Blastoidea Class Cystodea: Porous theca with polygonal plates Stalked/ stalkless Eg : Cryocrinites Class Cystodea Class Edrioasteroidea: Disc shaped Cushion shaped theca Anus & madreporite on oral surface Eg : Lepidodiscus Class Edrioasteroidea Class Crinoidea: Extinct stalked Living stalkless / free living Pentamerous Oral surface faces upwards Doliolaria larva seen Eg : Antedon , Flexibilia , Xenocrinus Class Crinoidea Sub-phylum PELMATAZOA: Sub-phylum PELMATAZOA Asteroidea Echinoidea Ophiuroidea Holothuroidea Examples: Asterias Pentaceros Astropecten Heliaster Ophioderma Asteronyx Melonechinus Echinus Hemiasters Antedon Flexibilia Xenocrinus Class Asteroidea: Star shaped hollow arms Has tube feet Madreporite present on aboral side Sessile/ pedunculate pedicellaria Branchiolaria larva seen Eg : Asterias , Pentaceros , Astropecten , Heliaster Class Asteroidea Class Ophiuroidea: Deep sea forms Distinct oral and aboral surfaces No ambulacral groove Madreporite on oral side Pleuteus larva seen Eg : Ophioderma , Asteronyx Class Ophiuroidea Class Echinoidea: Spherical disc-like body enclosed in shell with outer calcareous plates Has 5 ambulacral areas and inter- ambulacral areas Stalked pedicellariae Echinopleuteus larva seen Eg : Melonechinus , Echinus, Hemiaster Class Echinoidea Class Holothuroidea: Body elongated in oral- aboral axis Mouth surrounded by set of tentacles attached to water vascular system Tube feet help in locomotion Auricularia larva seen Eg : Holothuria , Cucumaria , Thyone , Synapta Class Holothuroidea Thank You: Thank You

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