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5 hours ago, minnbuckeye said:

@Tidgy's Dad A zooid is one animal that is part of a colonial animal, so includes bryozoa, corals, or even graptolites, as examples. 

 

From a layman's perspective, I always thought a graptolite was an individual organism. You are saying it is a host of individuals????

Indeed, you have the colony.

Image result for graptolite

or 

Image result for graptolite

And in each stipe (branch) are many thecae, each one holding a tiny zooid. 

Image result for graptolite

Image result for graptolite

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Tortoise Friend.

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7 hours ago, fifbrindacier said:

Hmm, i have doubts now, sponge or bryozoan ?

Sponges have spicules.

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7 hours ago, fifbrindacier said:

Hmm, i have doubts now, sponge or bryozoan ?

Sponges have spicules.

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On 6.5.2018 at 1:01 PM, FNG said:

Just curious but why was coral ruled out as a possibility so quickly? I thought that it might be a type of staghorn when I first saw it. Is it too porous?

 

Because the skeletal structure is different from a coral. I would rather guess sponge or Bryozoa.

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