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Reproduction Florida sea shell

In sea urchins the sexes are separate. The Florida sea shell spawning is synchronised in species, this mass spawning improves the chances of fertilisation and reduces the overall affect of predation. Eggs and sperm are ejected into the sea, the fertilised eggs developing into free swimming larvae. The larvae join the other plankton and are carried by the currents until they settle on the sea bed and metamorphose into a minute adult.

Shore Urchin Psammechinus miliaris florida sea shell:
The Shore Urchin is the most common urchin found on Cornish rocky shores. They are a small urchin, rarely over an inch and a half. The green spines have a purple tip giving it its alternative name the purple tipped sea urchin.
The shore urchin is an omnivore, as well as grazing algae, will also take small sessile creatures such as barnacles, bryzoans and sea squirts.
Shore urchins are found in rock pools but are often missed as they camouflage themselves by gripping to the shell, pebbles, shells and seaweed. It has been said that this may not be for camouflage, but for when they are stranded in shallow rock pools, to shade them from the sunlight.
Edible Sea Urchin Echinus esculentus

The edible sea urchin of florida sea shell is  common but only offshore, but they can be found on the lower shore. The test is reddish while its spines are more purple.

Urchins' tests are sold in souvenir shops often being made into lamp shades. The meat is considered good eating in France. They are dived for, heavily reducing their numbers. More about florida sea shell