invertebrates phylum echinodermata

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Invertebrates Phylum Echinodermata. Vocabulary 0ssicle = protective spines on a sea star Ampulla = a bulb-like sac at the base of a tube foot that functions in movement Bipinnaria =free swimming larva. Vocabulary Pedicellariae = pincer-like structure that protects and cleans body surface - PowerPoint PPT Presentation

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Invertebrates Phylum

EchinodermataVocabulary

0ssicle = protective spines on a sea star

Ampulla = a bulb-like sac at the base of a tube foot that functions in movement

Bipinnaria =free swimming larvaVocabulary

Pedicellariae = pincer-like structure that protects and cleans body surface

Madreporite = sieve-like plate on the abdomen where water enters

General Characteristics

A. Undergo Metamorphosis - Bipinnaria to bottom-dwelling adult

B. Endoskeleton = internal skeleton

C. Water Vascular System - aids in movement and feeding

General Characteristics

D. Tube Feet = help with movement, feeding, respiration, excretion

E. Nervous System - no head or brain

F. Fossils - date back to Cambrian period (over 500 million years ago)

G. Radial SymmetryReproduction

A. Asexual = regeneration (if part of central disk is attached)

B. Sexual = releases eggs from holes under arm; eggs form tiny swimming larvae; larvae settle on bottom & develops into sea star

Water Vascular System

(network of canals where muscle contraction permits movement)

A. Water enters sieve plate; passes through madreporite and down a canal

B. Radial canals carry water to tube feetWater Vascular System

C. Muscles contracts forcing water into ampulla; creates suction; suckers grip surface

D. Ampullae contracts; water enters feet, releasing grip and feet extend

Other EchinodermsA. Crinoidea lily-like= sea lilies and feather stars

EchinodermsB. Asteroidea star-like = starfish; live in coastal waters and rocky shores

EchinodermsC. 0phiuroide snakelike = largest class; basket stars and brittle stars

EchinodermsD. Echinoidea hedgehog like = sea urchins & sand dollars

EchinodermsE. Holothuroidea = soft bodies; armless sea cucumbers

Radial CanalGonadsTubeFeetStomachSieve PlateDigestiveGlands