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اندام رشدنیافته ایماگویی
An invagination from the ectoderm fuses with the middle sac to form the imaginal rudiment, and only the aboral epidermis is derived from the larval dermis.
During metamorphosis, the larva settles on the sea floor and the imaginal rudiment separates from the larva, which then degenerates.
While the imaginal rudiment (now called a juvenile) is re-forming its digestive tract, it is dependent on the nutrition it receives from the disintegrating larval structures.
FIGURE 21.17 The imaginal rudiment growing in the left side of the pluteus larva of a sea urchin.
Almost the entire body of the adult sea urchin comes from the left coeiomic sac of the pluteus archenteron, known as the imaginal rudiment.
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