Ch 5: Phylum Ctenophora Flashcards
1
Q
what type of symmetry do ctenophores have?
A
bilateral
2
Q
body layers (3)
A
- ectoderm
- thick mesoglea with amoeboid cells
- endoderm
3
Q
are the epithelial cells attached to anything?
A
yes; basal lamina and neighbouring cells
4
Q
do ctenophores have muscles?
A
yes; in the mesoglea (suggests triploblasticness)
5
Q
ctenophore features (6)
A
- planktonic, transparent zooplankton eaters
- 1cm in size
- have 2 long tentacles that bear threadlike prehensile retractable tentilla
- comb rows are bioluminescent
- hermaphrodites with direct development
- have statocysts
6
Q
where do the tentacles go?
A
retract into 2 sheaths on aboral side
7
Q
what are collocytes?
A
sticky cells on the tentilla that can shoot out sticky threads
8
Q
how do ctenophores do gas exchange?
A
diffusion via SA
9
Q
how do ctenophores get rid of nitrogenous wastes?
A
anal pore and digestive system
10
Q
how do ctenophores avoid predation?
A
being seethrough
11
Q
ctenophore locomotion?
A
via rows of cilia
12
Q
ctenophore gut
A
thru gut with anal pore
