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Bio 106 Echinodermata facts!
Bio 106 Echinodermata facts!
14
Zoology
Undergraduate 2
11/14/2017

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Term
Phylum Echinodermata Animals
(7)
Definition
Sea stars
Brittle stars
Sand dollars
Sea urchins
Sea cucumbers
Feather stars
Sea lilies
Term
Echinodermata Symmetry
(2)
Definition
Young (bilateral symmetry)
Adults (pentaradial symmetry)
Term
Echinodermata Nervous System
(3)
Definition
No head or brain
No use for cephalization
Has nerve ring
Term
Echinodermata Skeleton
(2)
Definition
Endoskeleton
Composed of calcium carbonate ossicles
Term
Echinodermata Dermal Branchiae
(2)
Definition
"skin gills"
Allow gas exchange
Term
Echinodermata Respiratory and Circulatory Systems
Definition
No true system
Term
Echinodermata Coelom Evolution
Definition
Water Vascular System
Term
Water Vascular System
(2)
Definition
Uses sea water to generate hydraulic pressure
Powers tube feet for locomotion and capturing prey
Term
Echinodermata Deuterostomes
(3)
Definition
Develops anus first
Exhibit indeterminate development
Cells divide by radial cleavage
Term
Phylum Echinodermata
(5)
Definition
Class Crinoidea (Sea lilies, Feather stars)
Class Ophiuroidea (Brittle stars)
Class Echinoidea (Sea urchins and Sand dollars)
Class Asteroidea (Sea stars)
Class Holothuroidea (Sea cucumbers)
Class
Class
Term
Class Crinoidea Structure
(4)
Definition
Stalk present, attached to aboral surface
Mouth and anus both present on oral surface
Branched arms w/ feathery pinnules
Madreporite absent
Term
Class Ophiuroidea Structure
(4)
Definition
Long, slender arms distinct from central disc
Tube feet lack suckers, NOT used for locomotion
No ambulacral grooves
Madreporite on oral surface
Term
Class Echinoidea Structure
(4)
Definition
Spherical/disc shaped body w/o arms
Endoskeleton plates fused to form test
Tube feet w/ suckers
Well-developed, movable spines
Term
Class Holothuroidea Structure
Definition
Soft and cylindrical body w/o arms
Spines absent
Tube feet w/ suckers
Branching tentacles surround mouth
Madreporite internal
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