ch. 33 deuterostome echinodermata Flashcards
phylums of deuterostomes
cordata and echinodermata
classes of echinodermata
- asteroidea
- ophiuroidea
- echinodea
- Crinoidea
- holothroidea
ex. of asteroidea
sea star
ex. of ophiurodiea
brittle star
ex. of echinodea
sea urchins
ex. of crinoidea
sea lillies
holothroidea
sea cucumber
phylum echinodermata characteristics
- modified radial symmetry
- cephalization absent
- endoskeleton covered with spines
- water vascular system
- no excretory organs
- complete digestive system
- autotomy
symmetry of phylum echinodermata
- modified radial symmetry - 5 parts
- secondary - larvae are bilateral
does echinodermata have a brain
no - has simple nervous system
endoskeleton of echinodermata
covered with spines and pedicellariae
water vascular system of echinodermata
tube feet function in movement, gas exchange, and feeding
how do respiration and excretion occur in echinodermata?
by diffusion
autotomy
intentionally detach body part that will later regenerate
auto
self
tomy
cutting
how do echinodermata reproduce
sexually - external fertilization
asteroidea
- regenerate lost arm
- feed on bivalves by prying them open and external digestion
ophiuroidea
brittle star
aster
star
ophis
snake
echninoidea
- sea urchins and sand dollars
- no arms but have 5 rows of tube feet
crinoidea
- sea lilies
- both use arms in suspension feeding
krinon
lily
erchin
spiny
holothuroidea
- sea cucumbers
- very reduced endoskeleton
- 5 rows of tube feet
- breach through anus
holo
whole
