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Phylum Echinodermata “Spine skin” Marine (or estuarine) Water vascular system Pentaradial symmetry
Echinodermata 6500 species living 13,000 from fossils Classes: Crinoidea, Stelleroidea, Echinoidea, Holothuroidea
Water vascular system Fluid-filled canals that lead to tube feet Sea star: madreporite, stone canal, ring canal, radial canal, ampulla, tube feet
Water vascular system Tiedemann’s body: Contains phagocytes; remove foreign matter such as bacteria from incoming seawater
Water vascular system Ambulacral ossicles support ampullae and tube feet Contraction of ampulla moves fluid to tube feet Muscles in tube feet for retracting HPhAGyDceLo
Water vascular system Cilia on inner surface of tube feet circulate water Gas exchange Fluid similar to seawater; contains coelomocytes, proteins, K ions
Class Crinoidea Lily-like Feather stars and sea lilies Oldest of living echinoderms
Class Crinoidea Feeding, repro structures at top of stalk Complete digestive system in calyx: mouth – intestine, anus ch?v=s1xfRc4SDsw
Class Crinoidea Arms have ambulacral groove with mucus- secreting glands adjacent. Food particles stick in mucus, flicked to the ambulacral groove, then mouth
Class Stelleroidea Armed echinoderms Brittle stars, sea stars
Brittle stars and basket stars ~ 2100 described Joints allow flexibility Tube feet present Sensitive to light – oral surface mj8ZYysrmxU
Brittle stars and basket stars Tube feet through small holes Digestive system mostly in disc – no anus Bursal slits for water exchange
Deposit feeders, suspension feeders, carnivores, scavengers Many are nocturnal Many live in associations Brittle stars and basket stars
Sea stars ~ 1600 species Arms not as distinct from disc as in brittle stars Move slowly with tube feet Tube feet move individually
Sea stars Digestion: lower cardiac stomach digests food Upper pyloric stomach for secreting enzymes and absorption
Pedicellariae: stalked or sessile
Concentricycloids – sea daisies Recently (1986) discovered echinoderms > 1000 m New Zealand, Bahamas –Tube feet arrangement different
Class Echinoidea: spine-like Sea urchins, sand dollars < 1000 species
Class Echinoidea: spine-like Ossicles form test Complex system of ossicles and muscles for grazing = Aristotle’s lantern
Spines attach to skeleton – ball and socket joint Toxins Ossicles flat and joined = inflexible
Class Echinoidea: spine-like Tube feet in 5 double rows of plate Pedicellariae – globular forms have toxin
Feeding and digestion: Aristotle’s lantern Teeth protruded to scrape algae or consume food Species w/o lantern usually detritivores
Mouth – esophagus – intestine – anus WVS m/watch?v=D3W4OCn HyCs
Class Holothuroidea: sea cucumbers ~ 1200 species
Ossicles microscopic Multiple shapes
Tube feet modified into tentacles around mouth Mostly deposit-feeders, few filter-feeders
Digestion system: elongated Mouth – esophagus – stomach – intestine – cloaca – anus WVS – madreporite in coelomic cavity = no outside connection
Respiratory tree: connects to cloaca – water supply Expulsion of internal organs
Echinoderm repro + development: Some are asexual Most are dioecious Multiple gonads, gametes into seawater = external fert
Distinctive ciliated larval form in each class Free-swimming, planktonic Metamorphosis into adult
Echinoderm NS No brain 3 nerve networks Ectoneural = ring around esophagus: receives sensory input
Echinoderm NS Hyponeural = circumoral nerve: motor function Entoneural = associated with aboral end, neurons from stalk down arms
Echinodermata Spiny Skinned. Echinoderms *6000 living species 20,000 extinct species *all oceans, all depths *Planktonic larvae - bilateral symmetry *adult.
Chapter 16-The Echinoderms Phylum Echinodermata- Spiny- skinned animals of-animals-phylum-echinodermata-video.htm.
Phylum Echinodermata. Introduction n Echinodermata are all marine, triploblastic unsegmented coelomates n Phylum has 3 unique features: u pentagonal symmetry.
Echinoderms Spiny Skinned Animals. Echinoderm Characteristics Radial Symmetry ( aboral and oral sides) Radial Symmetry ( aboral and oral sides) All marine.
Echinoderms. Spiny skin Spiny skin Radial symmetry Radial symmetry Water vascular system Water vascular system.
Click on a lesson name to select. Section 1: Echinoderm Characteristics Section 2: Invertebrate Chordates Chapter 27 Echinoderms and Invertebrate Chordates.
1.Belong to phylum Mollusca which means “soft” in Latin. 2. They are soft-bodied animals that usually have an internal or external shell. 3. Includes snails,
Phylum Arthropoda. Several million species. Hard exoskeleton.
Sponges are sessile and have a porous body and choanocytes Sponges, phylum Porifera, live in both fresh and marine waters Sponges lack true tissues and.
ECHINODERMATA By: Laura Hein, Jaeyoung Kim Period 3 Rall
The Animal Kingdom. Characteristics of Animals Multicellular eukaryotes Heterotrophic Gametic Life Cycle (dipoid/meiosis/gametes/fertilization/zygote/
Chapter 13 Annelida: The Merametric Body Form. Phylum Annelida Segmented worms believed to have evolved in the sea where two-thirds still live Other one.
WORMS. Flatworms: Phylum Platyhelminthes Soft and Flat Soft and Flat Tissues and Internal Organ Systems Tissues and Internal Organ Systems 3 embryonic.
Kingdom Animalia. ~ Characteristics ~ Multicellular Multicellular Eukaryotic with no cell walls Eukaryotic with no cell walls Heterotrophs (consumers)
Section 27.1 Summary – pages Slugs, snails, squids, and some animals that live in shells in the ocean or on the beach are all mollusks. These.
Kingdom Animalia. Bellringer 3/22/11Copy questions and answer on page Which of these organisms do you think are animals? 2. On what characteristics.
WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.
INVERTEBRATES About 97 percent of all animals are invertebrates.
INVERTEBRATES CH Kingdom Animalia Major Characteristics= eukaryotic, multi-cellular, heterotrophic, lack a cell wall Invertebrates Include 95-97%
Chief Caretaker - Mr. E. Heinrichs To successfully visit the Virtual Zoo just click on the location you wish to explore. Learn all you can then visit.
Chapter 5 - Tissues Membranes, Muscle Tissues, and Nervous Tissues.
Johnson - The Living World: 3rd Ed. - All Rights Reserved - McGraw Hill Companies The Animal Body and How It Moves Chapter 22 Copyright © McGraw-Hill Companies.
CHAPTER 26 Sponges, Cnidarians, Flatworms, and Roundworms.
Classifying Animals- Ch. 19 Objectives: Learn how biologists classify animals with their features, obtaining and digesting food, and respiratory and circulation.
Simple Invertebrates Sponge Sponges are asymmetrical and do not have real tissue or organs. Cnidarians have radial symmetry and have a mouth, tentacles,
Introduction to Vertebrates. Vertebrate Vocabulary Chapters Chordate 2.vertebrate 3.vertebra (712) 4.agnathan (714) 5.ectothermic (724) 6.endothermic.
Click on a lesson name to select. Chapter 25 Worms and Mollusks Section 1: Flatworms Section 2: Roundworms and Rotifers Section 3: Mollusks Section 4:
Kingdom Animalia Ch. 12- Phylum Mollusca. Key Characteristics of Mollusks 2 nd largest animal phylum Marine, freshwater, and terrestrial Seven classes.
Sponges Phylum Porifera. SPONGES ARE STRANGE Only meet MINIMUM requirement for Kingdom Animalia –Multicellular, eukaryotic cells, heterotrophic, moves.
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