Fig. 1 in Development and gastrulation in Hyloxalus vertebralis and Dendrobates auratus (Anura: Dendrobatidae)

Fig. 1. External views of H. vertebralis embryos from cleavage to the neurula stage. (A) Stage 2: Two-cell stage. (B) Stage 4: Eightcell stage. (C) Stage 5: Sixteen-cell stage. (D) Stage 9: Advanced blastula. (E) Stage 10: Early gastrula. (F) Stage 11: Mid-gastrula. (G) Stage 12: Late-gastrula. (H) Stage 12.5: Late-gastrula with a small yolk plug. (I) Stage 13: Slit-blastopore stage. (J) Stage 13.5: Advanced slit-blastopore stage. The neural plate was visible. (K) Stage 14: Early neural fold stage. (L) Stage 15: Mid-neural fold stage. In this and the following figures, the developmental stage (st) is given in top right-hand corner of each image; b, blastopore; c, cleavage furrow; dl, dorsal blastopore lip; np, neural plate; nt, neural tube; yp, yolk plug.