Ctenophora Flashcards
What is the literal meaning of ctenophora
Comb bearing
What are the common names for ctenophores ?
sea walnuts and comb jellies
What are there habitats ?
Marine. Found in poles to shallow waters.
Name the two classes of the phylum Ctenophora
Tentaculata & Nuda
(Ctenphores usually Transparent and fragile)
What is the symmetrical characteristics of ctenophora
Biradial or radial symmetry.
What germ layer do ctenophora have?
Diploblastic (they have two)
(They have a gelatin matrix like cnidaria; mesoglea)
They have a central cavity.
(T/ F)
T
What does the central cavity do?
The central cavity communicates with the exterior by the mouth and several anal pores.
Do they have organs?
They do not have distinct organs.
Where to ctenophora true musclar cells develop in?
(gelatin layer)
Mesoglea
What do muscle fibers make?
(what squidward had).
Tentacles.
Nervouc system have naked nerve cells/ True or False?
(Think transparency)
True
Describe their tentacles?
(housed in? how many? associated with mouth or no?)
Covered in sheath.
Not associated with mouth like cnidarians.
Typically have only two.
How many comb plates (aboral rows) do ctenophores have?
(think about squidward he’s an octopus so have how many? )
8 abordal rows
Where are the cilia fused to in ctenophora
Aboral Plates (comb plates)
(there are 8 plates)
What is the cilia called in ctenophora
Ctenes
Ctenes extend transversely from oral to aboral ends
(true or false)
true
What direction to the ctenes beat?
From aboral end to oral end
What direction is the movement?
Mouth first
WHAT DIRECTION IS THE powerstroke
Towards the aboral end.
What structures or features coordinate movement of the ctenophora
Nerve net and apical sense organ.
(statocyst)
The apical sense organ and the nerve net makes up the ?
Statocyst
What is colloblast?
Adhesive cells that capture prey. have adhesive material
what allows tentacles to contract?
coNTRACTILE FIBRES.
whAT IS THE FUNCTION OF TENTACLES IN THE CTENOPHORA?
They produces sticky threads when prey come into contact with their colloblast.
How does the prey go into the mouth of the ctenophora ?
The tentacles wipe the prey along the mouth of the ctenophora for ingestion to begin.
What does the mouth of the ctenophora lead to ?
Gastrovascular canal
How is the waste of the ctenophora eliminated?
Through the gastrovascular canal but primarily through the mouth of the ctenophora.
There are 3 ways in which ctenophores capture prey.
- Using tentacles colloblast which then swips prey to the mouth there ingestion occures
- Short tentacles? No problem. Ciliated body allows for collecting prey.
- Lack tentacles? Feed on their own kind (ctenophores) or medusa.
- Some actually feed on cnidaria and take their cnidocytes then encorporates it in their epithelial tissues which is used as defense.
What is the defense of the ctenophores ?
Some actually feed on cnidaria and take their cnidocytes then encorporates it in their epithelial tissues which is used as defense.
Describe the life cycle of ctenophores.
- Holoplanktonic
- Hermaphrodite
- Reproduce at a young age (invasive at times).
Order: Beroida. Describe shape.
can be flat, cylindrical. Long animals.
Class: Lobata. Describe morphology.
Have extended lobes that are used to capture prey on their surface.
They have short tentacles.
Class: Cydrippida. Describe morphology.
Oblong or round. Same as Pleurobrancia.
Class: Pleurobrancia. Describe morphology.
Round or oblong. Same as cydrippida.
Example of a ctenophora?
Comb jelly and Venus Girdle
What causes light cattering?
The beating of the eight rows of locomatory cilia.
