Fig. 3 in Development and gastrulation in Hyloxalus vertebralis and Dendrobates auratus (Anura: Dendrobatidae)

Fig. 3. Internal morphology of the H. vertebralis and D. auratus early gastrula. Micrographs of H. vertebralis embryos are shown in A, B, E–G, and micrographs of D. auratus embryos are shown in C, D, H–J. Sections shown in E–G, I–J were stained for cell nuclei. (A) Stage 9: Sagittal section of an advanced blastula. (B) Stage 10: Sagittal section of an early gastrula. (C) Stage 10: Sagittal section of an early gastrula. (D) Stage 11: Sagittal section of the mid-gastrula. (E) Stage 10: Higher magnification of the dorsal blastopore groove from the embryo in B. The arrow signals a bottle cell. (F) Stage 10: The blastocoel roof of an early gastrula. It was two-three cells in thickness. (G) Stage 12.5: One cell layer in the blastocoel roof of a late-gastrula. (H) Stage 10: Higher magnification from the embryo in C. The arrow signals a bottle cell. (I) Stage 10: The blastocoel roof of an early gastrula of two cells in thickness. (J) Stage 11: The blastocoel roof of mid-gastrula with one-two cells in thickness. bl, blastocoel; bg, blastopore groove; dl, dorsal blastopore lip; vl, ventral blastopore lip.