4_Ctenophores Flashcards
What is the phylum known as comb bearing?
CTENOPHORA/ CTENOPHORES
Ctenophores are commonly known as?
“sea walnuts”
“comb jellies.”
Name derived from ‘______’— plates of fused cilia arranged in rows (comb rows or costae)
ctenes
GENERAL MORPHOLOGICAL FEATURES
of ctenophores?
- Biradial symmetry
- Dipoblastic
- Colloblasts (adhesives) instead of
nematocysts - Combs or ctenes around its body
Prey are caught by epidermal glue cells called __________ which contain
an adhesive material discharged on contact with prey
colloblasts
How many rows of combs (ctenes) arranged radially around body?
8
What is its locomotion?
planktonic and weak swimmers
Part of nervous and sensory organs, it is the apical sense organ and is found at the aboral end that controls the intensity of the activity of comb rows
Statolith
statolith – single sphere of CaCO3 that sits
atop 4 tufts of fused cilia called _____________ —each of which connects with
one comb row
balancers or springs
What one species has nematocyst in their
tentacles obtained from ingestion of cnidarian medusae—phenomenon known as ______
Haeckelia sp.
kleptocnidae
A sexual reproduction where gametes are shed out through the mouth; rarely internal fertilization (in some benthic species only)
External fertilization
What do you call the larva in ctenophores? in Cnidarians?
Cydippid larvae
Planula larvae
They don’t have true asexual reproduction?
True
What is called when colors generated by
diffraction of light
Iridescence
What results from a chemical
reaction which much of the excess energy
is given off as light
Bioluminescence
What are the possible functional significance of Iridescent and Bioluminescent?
o mate location and species recognition
o luring of prey
o startling of predators
o avoid detection of predators
What are the classes under Ctenophora?
Class Tentaculata
Class Nuda
Class Nuda:
Ctenophores without tentacles or oral
lobes
* 1 order – Order Beroida
* 8 comb rows are well developed
* food capture is aided with muscular lip
surrounding the mouth
* the mouth can be widened to
accommodate prey larger than the
predator
Order Beroida
What is the sexuality of ctenophores?
Hermaphroditic
