Animal Div Ctenophores Lec 7

What are Ctenophores?

Comb jellies (comb bearers)- 8 comb rows with paddle-like ctenes (plates of cilia) for swimming

what are the characteristics of ctenophores

8 comb rows, Biradial symmetry, Colloblast cells (sticky; AKA"lasso cells"), Exclusively marine

how do carnivorous ctenophores eat?

muscular mouth lobes

what is kleptocnidism

Haeckelia rubra carries undischarged nematocysts after feeding on cnidaria medusa

the nervous system of ctenophores has a __________ similar to cnidarians

nerve net

what is a statocyst

-sense organ on the aboral pole
-determines equilibrium (up and down)
-contains a statolith (calcerous particle) that determines gravity

most ctenophores are ____________ (hermaphrodidic)

monoecious

how do ctenohpors reprodue sexually?

− Gametes shed into water via mouth; free swimming larva− Some undergo internal fertilization & brood their eggs!

T or F
Ctenophores can be mobile and sessile

true

what are the ctenophore body forms?

• Tentaculate (free-swimming)
• Lobate (free-swimming)
• Thimble-shaped (free-swimming)
• Ribbon (free swimming; VenusGirdle)
• Creeping sole (epibenthic, sessile

What are Xenacoelomorpha?

-no anus
-no nephridia
-bilateral
-triploblastic
-neither protostome or deuterostome
-basal sister group of bilaterians

T or F
nephrozoans include protostomes, deuterostomes and Xenacoelomorpha

false
only protostomes, deuterostomes