Wednesday, June 22, 2011
Grunion Development: Day 4
The embryos are noticeably larger, and structures are becoming readily apparent. You can see the nerve cord running down the center of the embryo. gill arches forming behind the eye, and the eye itself has an indented pupil.
What you can't tell from the picture is that the heart is also nociable and pumping, and there are musculature visible along the length of the tail.