Lab practical (Ctenophores)

Cteophores are

comb jellies

Ctenophores are simultaneous hermaphrodites. This means?

Have both male an female parts and can self fertilize

colloblasts

Adhesive cells lining the tentacles that help comb jellies catch prey

What differs ctenophores from cnidarians?

No alternation of generations, complete gut, no dimorphism, no colonial organization

Ctenes

Fused cilia that operate like paddles

The ctenophore body wall consists of

an outer epidermis and an inner gastrodermis separated by mesoglea

Comb rows

8 rows of fused cilia (ctene) that aid in movement

tentacle sheath

structure where the tentacle attaches to the main body of a ctenophore

Tentacle bulb

the base of the tentacle where the tentacle extends from the sheath

What differs ctenophore tentacles from cnidarian tentacles?

ctenophore tentacles are branched

Tentilla

the branches of ctenophore tentacles that bear colloblasts

photocytes

animal cells in which bioluminescence occurs

aboral organ

center for gravity detection and control of the comb rows

The aboral organ is composed of

calcareous statolith, balancer cilia, and two ciliary grooves.

Gonophores

where gametes are shed, located in the comb rows

Development of ctenophores

direct, and includes cydippid larvae which resemble the adult.

What type of symmetry do ctenophores have?

biradial