Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Lepisosteus osseus. Stages 16-20. A). Stage 16, dorsal view. B) Stage 16, lateral view. C) Stage 17, anterior view. D) Stage 18, lateral view. E) Stage 19, lateral view. F) Stage 20, lateral view. ttb = trunk-tail bud sgc = limit of subgerminal cavity p = pronephric duct ov = optic vesicle d = diencephalon ao = adhesive organ ph = pharyngeal pouch op = operculum u = undercut trunk-tail bud
