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Phylum Echinodermata (Body Systems (water vascular system (WVS) (fluid…
Phylum Echinodermata
Body Systems
symmetry
secondary pentaradial
bilateral ancestors & larvae
excretion
WVS
gas exchange
WVS
locomotion
WVS
respiration
WVS
accessory structures
circulation
WVS
additional hemal system may help distribute nutrients
digestion
complete
nervous
radial
circumoral & circumanal nerve rings w/ radial nerves
water vascular system (WVS)
derived from coelom
fluid-filled canals that function hydrostatically
madreporite
stone canal
ring canal
radial canals
lateral canals
ampullae
1 more item...
may have Polian vesicles or Tiedemann's bodies
additional water storage
Body Structures
internal skeleton of calcium carbonate
continuous plates form a test
ossicles scattered through body wall
spines
central disk w/ projections
oral side
aboral side
ambulacra/amulacral grooves
pedicellaria
parasite defense
Reproduction
dioecious
external fertilization
various larval forms
asexual by fission or regeneration
Taxonomic Divisions
five classes of echinoderms
Crinoidea
arms w/ pinnules
no madreporite
Asteroidea
thick arms w/ organs
aboral madreporite
Ophiuroidea
thin arms w/o organs
oral madreporite
Echinoidea
hemispherical or flattened, continuous test
aboral madreporite
Holothuroidea
bilateral symmetry
internal madreporite
Development
early & late bipinnaria
brachiolaria
juvenile sea star
adult