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زیست شناسی::
توتیای دریایی
Sea urchin larvae, for instance, are bilaterally symmetrical organisms that float among and collect food in the plankton of
In sea urchins, none of the axes of the larva are preserved, as the adult forms from a small pouch on the left side of the larval gut.
The sea urchin adult, on the other hand, is pentameral (i.e.
Sea urchins undergo complete metamorphosis, forming a "primary larva"-the p!
Almost the entire body of the adult sea urchin comes from the left coelomic sac of the pluteus archenteron.
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