Fig. 5. Stage 15 in Development and gastrulation in Hyloxalus vertebralis and Dendrobates auratus (Anura: Dendrobatidae)

Fig. 5. Stage 15: Mid-neural fold stage of embryos of H. vertebralis and D. auratus. 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–B) Dorsal views of embryos. The neural tube was open in embryos of both species. (C) Cross section through the caudal region. The notochord was not detected in this caudal region (Reproduced from Hervas and del Pino, 2013). (D) Cross section through the trunk region. The notochord was visible. e, endoderm; ec, ectoderm; n, notochord; nf neural fold; pm, paraxial mesoderm.