Dark field photomicrograph of a sea urchin egg in the gastrula stage of development. The gastrula stage is marked by theinvagination of the endoderm layer inside the blastocoel to form the archenteron. The archenteron, or primitive gut, ev entually forms a digestive cavity. (c) Michel Delarue
Credit
ISM
/ Michel DELARUE
Dimensions
2362 x 2428 pixels
Print Size @ 300 dpi
8 x 8 inches / 20 x 21 cm