Caption

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

Writer

Louisa Howard

Keywords

marine invertebrate, SEM, sea urchin, embryo