Phylum Echinodermata Flashcards
level of organization in Echinodermata
organ system
What class does Asterias belong to?
Asteroidea
What class does Arabacia belong to?
Echinoidea
symmetry of Echinodermata
- adult form: radial
- larval form: bilateral
What organism is this?
Asterias
skeletal system of Echinodermata
ossicles and spines (calcareous plates)
excretory system of Echinodermata
lack specialized excretory structures
circulatory system of Echinodermata
reduced
What specimen is this?
Arabacia
digestive system of Echinodermata
complete (stomach, caeca)
nervous system of Echinodermata
nerve ring
body cavity of Echinodermata
triploblastic
reproductive system of Echinodermata
sexual reproduction: dioecious
method of locomotion for Echinodermata
water vascular system (fun fact: this network produces hydrostatic section necessary to anchor themselves & pry open shells for food as well)
