Fig. 2 in Development and gastrulation in Hyloxalus vertebralis and Dendrobates auratus (Anura: Dendrobatidae)

Fig. 2. External views of H. vertebralis embryos from closure of the neural tube to hatching. (A) Stage 16.5: Closure of the neural tube. (B) Stage 17: Tail bud stage. The brachial arches protruded on the sides of the head. (C) Stage 19: Embryo at the muscular response stage. (D) Stage 19.5: Gill buds of the two external gill pairs were visible. (E) Stage 21: Development of the external gills. There were seven branches in the first gill pair and the second gill pair was unbranched. (F) Stage 25: Embryo at hatching. br, branchial arch; e, eye; g, gills; gb, gill bud; tf, tail fin.