Specimen categories

[btrs]

Hey guys, I've noticed that aquarium specimens are only catagorized into 3 catagories: fish, invertabraes, and corals. What about sea urchins? Or octopus? Or other specimens like starfish?
Also, how is an anemome a invertabraes? Isnt it a coral? Also whats a polyp?

 

[mohawkninja]

An invert has no backbone. That should answer your question. Figure it out for the rest.

 

[btrs]

I know, but I mean do they classify them even more specifically, like ceplapods, molluscs, etc.?

 

[mohawkninja]

Yes, but you don't really need to know the scientific categories unless you are a marine biologist.