CHAPTER 22 Echinoderms Phylum Echinodermata Characteristics All members have a _____________________ skeleton Spiny endoskeleton consists of ____________________ Unique _______________-_____________________ system Possess _______________________ and dermal ______________________ ______________________ symmetry in adults Phylum Echinodermata: Diversity Asteroids or _______________________ Mostly ________________________ Ophiuroids or ________________________ Move by bending their __________________________ muscular arms May be scavengers, browsers, or commensal Holothurians or ______________________ Mostly ________________________ or deposit feeders Echinoids or _________________________ Found on hard bottoms while sand dollars prefer sand substrate Feed on _______________________ Class Asteroidea Diversity Common along __________________________ and may aggregate on rocks Some live on muddy or sandy bottoms, or among _____________________ reefs Approximately 1500 living species Range from a centimeter across to about a ________________ across and may be brightly colored Form and Function External Features Have a _______________________ disc with tapering arms extending outward Body is flattened and flexible, with a pigmented and ciliated _______________________
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
CHAPTER 22
Echinoderms
Phylum Echinodermata
Characteristics
All members have a _____________________ skeleton
Spiny endoskeleton consists of ____________________
Unique _______________-_____________________ system
Possess _______________________ and dermal ______________________
______________________ symmetry in adults
Phylum Echinodermata: Diversity
Asteroids or _______________________
Mostly ________________________
Ophiuroids or ________________________
Move by bending their __________________________ muscular arms
May be scavengers, browsers, or commensal
Holothurians or ______________________
Mostly ________________________ or deposit feeders
Echinoids or _________________________
Found on hard bottoms while sand dollars prefer sand substrate
Feed on _______________________
Class Asteroidea
Diversity
Common along __________________________ and may aggregate on rocks
Some live on muddy or sandy bottoms, or among _____________________ reefs
Approximately 1500 living species
Range from a centimeter across to about a ________________ across and may be brightly colored
Form and Function
External Features
Have a _______________________ disc with tapering arms extending outward
Body is flattened and flexible, with a pigmented and ciliated _______________________
Mouth is on the _________________________ or ________________ surface
______________________________ runs from the mouth to the tip of each arm
Usually there are _________ arms but there may be more
Ambulacral groove bordered by rows of ___________________ feet
_________________________ nerve located in center of each ambulacral groove
Under the nerve is an extension of the coelom and the _________________ canal of the water-
vascular system
_______________________ or other dermal tissue covers these structures
_______________________ surface is spiny
At base of spines are groups of ____________________-like pedicellariae
Keep the body surface free of ____________________
___________________ (dermal branchiae or skin gills) are soft projections
Function in _________________________
On the aboral side is a circular __________________________
Sieve leading to the water-vascular system.
Endoskeleton
Under the epidermis is the mesodermal _________________________
Small calcareous plates or _____________________
Bound together by an unusual form of mutable (change) collagen termed
___________________ collagen
Ossicles penetrated by meshwork of spaces filled with fibers and dermal cells, the
________________________
Muscles in the body wall move rays and partially close ambulacral grooves
Coelom, Excretion, and Respiration
Spacious body coelom filled with ____________________ is one coelomic compartment