invertebrates phylum echinodermata
DESCRIPTION
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 PresentationTRANSCRIPT
Vocabulary0ssicle = 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
VocabularyPedicellariae = 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 Symmetry
Reproduction
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 feet
Water 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 Echinoderms
A. 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