Phylum Echinodermata Flashcards
1
Q
major characteristics of echinoderms (5)
A
- eucoelomate deuterostomes
- water vascular system (operates tube feet)
- calcareous endoskeleton
- pentaradial symmetry
- mutable collagenous tissue
2
Q
how are coelomic compartments of deuterostomes formed
A
arise from outpocketings of the archenteron in embryonic stages
3
Q
the calcareous ossicles of echinoderms are covered by:
A
epidermal epithelium
4
Q
pentaradial symmetry is thought to be an adaptation to:
A
sessile lifestyle
5
Q
larval stages of echinoderms exhibit what kind of symmetry?
A
bilateral
6
Q
adult stages of echinoderms exhibit what kind of symmetry?
A
pentaradial
7
Q
what is mutable collagenous tissue?
A
connective tissue that can rapidly change their tensile properties in response to signals to the nervous system
8
Q
what do the echinoids and holothuroids have in common
A
no arms
