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Depending on the species, sea urchins range in size from a few inches across (small rock-boring urchins) to a foot or more across (pencil urchins and venomous hollow-spined urchins).
THATS NOT HELPFUL!!
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoSea Urchin spikes can be 1 to 3cm long and we are not sure if they are poisonouse but appear not to be dangerous to humans. In some regions of the Carribean Sea Urchins can have spikes that grow to 10 to 30cm long!
Wiki User
∙ 13y agoabout 100 or 1000, depends
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How big is an sea urchin?
1ft.
How do sea urchin lay eggs?
They either spit them out of there mouth or drop a spike and it makes a new body.
What are Sea urchin?
The classification of a Sea Urchin is Echinoidea
How much mass do sea urchins have?
You can't really answer this question because sea urchins have different masses depending on their size. For example, a small sea urchin will have a smaller mass than a big sea urchin.
The gonads of the are considered to be a delicacy?
sea urchin
What is the sea urchins phylum?
That depends, obviously, on the species of Sea Urchin. All belong to the Phylum Echinodermata (along with sea stars and sea cucumbers) and to the Class Echinoidea. They are then divided into different orders, genera and species. That depends, obviously, on the species of Sea Urchin. All belong to the Phylum Echinodermata (along with sea stars and sea cucumbers) and to the Class Echinoidea. They are then divided into different orders, genera and species.
How does the sea urchin moves?
A sea urchin does move, but not very frequently.
Why do the carrier crabs carry sea urchin?
because the crab needs the sea urchin for protection and the sea urchin needs the crab for food
What is a sea urchin's eggs?
Ummm...it's the thing from which a sea urchin hatches?
How big is a sea urchin?
Sea urchins or urchins are small, typically from 3 to 10 cm (1.2 to 3.9 in) across
Can a sea anemone live with a sea urchin?
I think a sea anenome and a sea urchin can live together because i have a little aquarium and there is a sea urchin and and a sea anenome (if that's how you spell it) living in there and they were perfectly fine. BUT if you have a sea urchin do not have any crabs in there, because my sea urchin killed one, and almost killed another one by taking its claw off. :(
What is the English name for a blue tuxedo sea urchin?
a blue tuxedo sea urchin
