Fig. 7. Stage 17 in Development and gastrulation in Hyloxalus vertebralis and Dendrobates auratus (Anura: Dendrobatidae)

Fig. 7. Stage 17: Tail bud stage of H. vertebralis embryos. (A) Lateral view of an embryo. (B) Cross section through the trunk region of the embryo in A. (C) Horizontal section at the level of the notochord and somites with the rostral region towards the left. A row of somites was detected on each side of the notochord. A portion of the neural tube was detected in the rostral region of the section. br, branchial arch; e, endoderm; ec, ectoderm; hy, hyoid arch; ma, mandibular arch; n notochord; nt, neural tube; s, somite.