Fig. 4. Stage 14 in Development and gastrulation in Hyloxalus vertebralis and Dendrobates auratus (Anura: Dendrobatidae)

Fig. 4. Stage 14: Early neural fold stage of H. vertebralis and D. auratus embryos. Micrographs of H. vertebralis embryos are shown in A, C, and micrographs of D. auratus embryos are shown in B, D. Sections shown in C–D were stained for cell nuclei. (A) Lateral view of a neural fold stage embryo. (B) Dorsal view of a neural fold stage embryo. The neural plate was visible in embryos of the two species. (C) Cross section through the region of the trunk (Reproduced from Hervas and del Pino, 2013). (D) Cross section through the caudal region of an embryo. The notochord was visible in C and D. b, blastopore; e, endoderm; ec, ectoderm; n, notochord; nf, neural fold; pm, paraxial mesoderm.