Phylum Echinodermata BIO 2215 Oklahoma City Community College Dennis Anderson Phylum Echinodermata • • • • Radial symmetry No head or brain Spiny skin Water vascular system • No excretory organs • Deuterostome • Bilateral.
Download ReportTranscript Phylum Echinodermata BIO 2215 Oklahoma City Community College Dennis Anderson Phylum Echinodermata • • • • Radial symmetry No head or brain Spiny skin Water vascular system • No excretory organs • Deuterostome • Bilateral.
Phylum Echinodermata BIO 2215 Oklahoma City Community College Dennis Anderson 1 Phylum Echinodermata • • • • Radial symmetry No head or brain Spiny skin Water vascular system • No excretory organs • Deuterostome • Bilateral lavrae 2 Porifera Platyhelmithes Mollusca Arthropoda Cnidaria Nemertea Annelida Echinodermata Hemichordata Lophophores Chordata Protozoans 3 Class Asteroidea Star Fish • 5 or more tapering arms • Mouth on underside • Endoskeleton – Ossicles • Tube feet • Feed on molluscs and sea urchins 4 5 6 Aboral Surface Madreporite 7 Pedicellaria Spine Pedicellaria Dermal branchia 8 Class Asteroidea Tube feet and ambulacral groove Aboral surface Oral surface 9 Water vascular system Madreporite Stone canal Ring canal Tiedemann’s bodies Polian vesicles Radial canal Lateral canal Tube feet 10 Tube feet 11 Tube foot Ampulla Lateral canal Body wall Tube foot Retractor muscles Podial muscle Sucker 12 Movement of tube feet 13 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Water-Vascular System of a Sea Star 14 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Body Wall and Internal Anatomy of a Sea Star 15 16 Feeding 17 Class Ophiuroidea Brittle Stars and Basket Stars • Central disc with distinct arms • No pedicellariae • Tube feet lack suckers and ampulla 18 Brittle star Mouth Bursal slit 19 Basket Star 20 Class Echinoidea Sea Urchins • Shell (test) encloses body – Ossicles form plates • No arms • Long spines – Movement – Venom 21 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Internal Anatomy of a Sea Urchin 22 Class Echinoidea Sand Dollar • Burrow in sand 23 Sand dollar Gonopore Madreporite Ambulacral region Lunule 24 Class Holothuroidea Sea Cucumbers • Soft body with reduced ossicles • Tentacles near mouth • Respiratory tree – Breaths through anus 25 26 Class Cridoidea Feather Stars and Sea Lilies • Most primitive • Feather like arms used for suspension feeding – Plankton • Tube feet trap planktonic organism • Cilia in ambulacral grooves carry food to mouth 27 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Class Crinoidea: Sea Lily Attach to substrate with stalk 28 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Class Crinoidea: Feather Star Swim and crawl 29 Central disk Mouth Anus Pinnule 30 Ancestral Echinoderms 31 Ancestral Echinoderms 32 The End 33