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Cnidaria

Phylum, notably members: anemones, hydra and jellyfish. radial symmetry, gastrovascular body plan, 2 cellular layers.


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coral plasticity definition

... clones, there's a lot of variation among the individuals. That suggests a lot of gene expression variability - for some reason (probably because cnidaria are supposed to be "primitive"), that seems to surprise people.

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by Darby
Tue Jan 11, 2011 4:35 pm
 
Forum: Zoology Discussion
Topic: coral plasticity definition
Replies: 1
Views: 1304

Re: Why Cnidaria swim?

There are many different forms of cnidaria, ranging from sessile corals to mobile jellyfish. The main reason for their mobile forms (including the medusa stage of anthozoans) is dispersal. Sometimes they swim towards the light for other reasons. ...

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by skeptic
Wed Mar 24, 2010 8:41 pm
 
Forum: Zoology Discussion
Topic: Why Cnidaria swim?
Replies: 4
Views: 3253

Why Cnidaria swim?

Hello, I'm working on some questions in zoology, and this is one of them: What is "The use" of a swimming stadium among Cnidaria (and also swamps) ? I think the answear is that becouse of a polyp- colony is single- sexual, they have to produse medusa, if they want to get some ...

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by ManBearPig89
Wed Mar 24, 2010 2:47 pm
 
Forum: Zoology Discussion
Topic: Why Cnidaria swim?
Replies: 4
Views: 3253

Re: Phyla Porifera and Cnidaria

Which form of parasitism do sponges usually engage in? Sponges are ectoparasites but I'm not aware fo a more specific description of the type of parastism they engage in. What mechanism do sponges adapt to protect itself from suspecting predators? Sponges use silicious spicules as a physical defens...

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by firechild
Tue Feb 02, 2010 1:23 am
 
Forum: Zoology Discussion
Topic: Phyla Porifera and Cnidaria
Replies: 3
Views: 13196

Phyla Porifera and Cnidaria

I wanted to know if you guys could help me out by explaining these questions to me cause I dont get a clear understanding of it from my zoology book: Which form of parasitism do sponges usually engage in? Sponges use secondary metabolites, because they can not move, when the sponge becomes threatene...

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by purplec16
Tue Feb 02, 2010 12:32 am
 
Forum: Zoology Discussion
Topic: Phyla Porifera and Cnidaria
Replies: 3
Views: 13196
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