Ctenophorans Flashcards
1
Q
what are some general traits of Ctenophora?
A
- carnivorous
- has mesothelial muscles
- has neurons
- gut
- two layers (epidermis/gastrodermis) and mesoglea
- nerve network
- solitary
2
Q
what are some unique traits of Ctenophora?
A
- 8 rows of ctenes (cilia combs)
- colloblasts
- 2 tentacles (typically)
- biradial symmetry (tentacular and pharyngeal planes)
- striated muscle
- apical sense organ
- one way excretion through anal pores
3
Q
what are the five classes of Ctenophora?
A
- cydippida (round)
- beroida (round w/o tentacles)
- lobata (oblong)
- cestida (belt)
- platyctenida (pancake)
4
Q
what is the structure of the apical sense organ?
A
statolith attached to four balancers (cilia bundles)
5
Q
what is the structure of a colloblast?
A
adhesive granules at the head connected to a long straight filament and a spiraled contractile filament
