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March 25, 2013
Scanning electron microscope image of Strongylocentrotus drobachiensus [sea urchin] embryo at the late gastrula stage. This high magnification image of the embryo shows the primary mesenchyme syncytial ring, where it attaches to the outer epithelial layer(ectoderm layer). The fine fibers are part of the blastocoel matrix. The primary mesenchyme syncytial ring is the precursor to spicule formation(developing calcareous larval skeleton). Class Echinoidea Superorder Echinacea Order Echinoida Strongylocentrotus drobachiensus JEOL 35C SEM Credit: Louisa Howard

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