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Echinoderm Characteristics Copyright © McGraw-Hill Education Echinoderms are Deuterostomes Echinoderms are deuterostomes – a major transition in the phylogeny of animals. The approximately 6000 living species of echinoderms are marine animals.
Echinoderm Characteristics Copyright © McGraw-Hill Education Body Structure Characterized by spiny endoskeleton The endoskeleton consists of calcium carbonate plates covered by a thin layer of skin. The skin contains pedicellariae, small pincers that aid in catching food and in removing foreign materials from the skin. Echinoderms have radial symmetry as adults. Larvae have bilateral symmetry.
Echinoderm Characteristics Copyright © McGraw-Hill Education Body Structure Water-vascular system The water-vascular system is a system of fluid-filled, closed tubes that work together to enable echinoderms to move and get food. The opening to the water-vascular system is called the madreporite, which draws water into the body. Water moves through a series of canals to the tube feet – tubes with suction-cuplike structures at the end, which echinoderms use for movement, food collection, and respiration. At the opposite end of the tube foot is a muscular sac called the ampulla, which expands and contracts to extend the tube foot.
Echinoderm Characteristics Copyright © McGraw-Hill Education Body Structure Feeding and digestion Echinoderms have a variety of feeding strategies beyond tube feet. Sea lilies and feather stars extend their arms to trap food. Sea stars can push their stomachs out of their mouths and coating their prey in digestive enzymes. Brittle stars trap organic matter in mucus on their arms. Sea urchins use teethlike plates to scrape algae off rocks.
Echinoderm Characteristics Copyright © McGraw-Hill Education Body Structure Respiration, circulation, and excretion Echinoderms use tube feet for respiration. Oxygen diffuses from the water through the thin membranes of the tube feet. Circulation takes place in the body coelom and the water-vascular system. Excretion occurs by diffusion through thin body membranes.
Echinoderm Characteristics Copyright © McGraw-Hill Education Body Structure Response to stimuli Have both sensory and motor neurons Sensory neurons respond to touch, chemicals dissolved in the water, water currents, and light. Many echinoderms can also sense the direction of gravity.
Echinoderm Characteristics Copyright © McGraw-Hill Education Body Structure Movement The structure of the endoskeleton is important for determining the type of movement an echinoderm can undertake. Swimming Crawling Burrowing
Echinoderm Characteristics Copyright © McGraw-Hill Education Body Structure Reproduction and development Most echinoderms reproduce sexually. Echinoderms can regenerate lost body parts.
Echinoderm Characteristics Copyright © McGraw-Hill Education Echinoderm Diversity Reproduction and development Living classes of echinoderms include: Asteroidea, the sea stars Ophiuroidea, the brittle stars Echinoidea, the sea urchins Crinoidea, the sea lilies and feather stars Holothuroidea, the sea cucumbers Concentricycloidea, the sea daisies
Echinoderm Characteristics Copyright © McGraw-Hill Education Echinoderm Diversity Sea stars Five arms arranged around a central disk Found in shallow coastal waters and tide pools Important marine predator
Echinoderm Characteristics Copyright © McGraw-Hill Education Echinoderm Diversity Brittle stars Arms are thin and very flexible, without suckers on tube feet. Move by rowing themselves quickly over the bottom rocks and sediments Feed on small particles suspended in the water
Echinoderm Characteristics Copyright © McGraw-Hill Education Echinoderm Diversity Sea urchins and sand dollars Sea urchins burrow into rocky areas. Can be herbivorous grazers or predators. Sand dollars can be found in shallow water burrowing into the sand. Filter organic particles.
Echinoderm Characteristics Copyright © McGraw-Hill Education Echinoderm Diversity Sea lilies and feather stars Sessile for part of their lives. Can detach themselves and move elsewhere Capture food by extending their tube feet and arms into the water where they catch suspended organic materials
Echinoderm Characteristics Copyright © McGraw-Hill Education Echinoderm Diversity Sea cucumbers Some tube feet are modified to form tentacles to trap suspended food particles. Only echinoderm to have respiratory organs in the form of respiratory trees, which also function in excretion When threatened, it can cast out some of its internal organs through its anus.
Echinoderm Characteristics Copyright © McGraw-Hill Education Echinoderm Diversity Sea daisies Less than 1 cm in diameter Disc-shaped with no arms Tube feet are located around the edge of the disc
Echinoderm Characteristics Copyright © McGraw-Hill Education Ecology of Echinoderms Echinoderm benefits Sea cucumbers and sea urchins are sources of food. Important in ecosystem balances, especially in controlling algal growth. Bioturbators – stir up sediments on the ocean floor, suspending nutrients into the water column
Echinoderm Characteristics Copyright © McGraw-Hill Education Ecology of Echinoderms Echinoderm harm When populations grow overly large, sea stars or sea urchins can disrupt ecosystems Can destroy habitats such as coral reefs and kelp forests
Click on a lesson name to select. Section 1: Echinoderm Characteristics Section 2: Invertebrate Chordates Chapter 27 Echinoderms and Invertebrate Chordates.
Chapter 16-The Echinoderms Phylum Echinodermata- Spiny- skinned animals of-animals-phylum-echinodermata-video.htm.
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,
Echinodermata Spiny Skinned. Echinoderms *6000 living species 20,000 extinct species *all oceans, all depths *Planktonic larvae - bilateral symmetry *adult.
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.
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.
Phylum Arthropoda. Several million species. Hard exoskeleton.
Phylum Echinodermata. Introduction n Echinodermata are all marine, triploblastic unsegmented coelomates n Phylum has 3 unique features: u pentagonal symmetry.
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.
Sea Stars Sea stars, or starfishes, or starfish are echinoderms, which means spiny-skinned. They are a very strange group of animals!
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:
Animal kingdom groups (phyla). What is an animal? Heterotroph (consumer, not decomposer) Heterotroph (consumer, not decomposer) Multicellular Multicellular.
CHAPTER 2 Section 1. Background information about Mollusks – They belong to the phylum Mollusca – Live nearly everywhere on Earth – Most live in water.
1. Chordate Characteristics Characteristics of Chordates A chordate is an animal that in some stage of development has: 1. Notochord- dorsal rod of specialized.
Section 26.1 Summary – pages Sponges are asymmetrical aquatic animals that have a variety of colors, shapes, and sizes. Many are bright shades.
1 Invertebrates. 2 Animal Characteristics All organisms in this kingdom have these common characteristics: All organisms in this kingdom have these common.
By: Bailey Wing, Kaylie Deswart. Cnidaris/Jellyfish B.W *Definition-a animal with tentacles that’s able to sting its prey or predators. *Body System-they.
Invertebrates By Alenna Naeve A.N. Arthropods/Arachnids Definition : An animal that has a jointed exoskeleton. Body systems: They breathe through organs.
Phylum Porifera. The word porifera originates from Latin and refers to the organism having a body full of _____. It literally means "pore bodied" or "pore.
Sponges Echinoderms Tunicates Lancelets Fish Amphibians Reptiles Birds Mammals Cnidarians Flatworms Roundworms Mollusks Annelids Arachnids Crustaceans.
Definition: A type of animal that filters the water it lives in to get food. Body Systems: Their symmetry is asymmetrical and they don’t have any body.
Kingdom Animalia. Bellringer 3/22/11Copy questions and answer on page Which of these organisms do you think are animals? 2. On what characteristics.
ECHINODERMATA By: Laura Hein, Jaeyoung Kim Period 3 Rall
Freshwater Ecosystems Objectives Describe the factors that determine where an organism lives in an aquatic ecosystem. Describe the littoral zone and.
CHAPTER 26 Sponges, Cnidarians, Flatworms, and Roundworms.
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 4: Ecosystems & Communities. Section 4.1 – The Role of Climate In Earths atmosphere, temperature, precipitation, and other environmental factors.
Compare and Contrast the Frog and Perch. What is an Animal? Chapter 25.1.
The Animal Kingdom. Characteristics of Animals Multicellular eukaryotes Heterotrophic Gametic Life Cycle (dipoid/meiosis/gametes/fertilization/zygote/
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