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March 25, 2013
Scanning electron microscope image of Strongylocentrotus drobachiensus embryo at the primary mesenchyme blastula stage. Embryo was split open to reveal the outer epithelial layer and the blastocoel cavity at the vegetal pole. At this stage of embryonic development, primary mesenchyme cells are forming(flask shaped cells in the epithelial layer) and beginning to migrate into the blastocoel cavity. Class Echinoidea Superorder Echinacea Order Echinoida Strongylocentrotus drobachiensus JEOL 35C SEM Credit: Louisa Howard

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