(Pipdae),and Ceratophrys stolzmanni (Ceratophryidae),and frogs with embryos placed in Aotating foam-nests were Engystomops randi and Engystommops coloradoruwm(Leptodactylidae)(Table1).In contrast,embryonic development was much slower in embryos of frogs with terrestrial adaptation.Frogsu with slow development include the Marsupial frog Gastrotheca riobambae(Hemiphractidae)that broods its embryos in a dorsal pouch of the mothrr and the dendrobatid frogs Epipedobates machalilla andEpipedobates tricolor(Dendrobatidae)that deposit their eggs in terrestrial nests(Table1)(del pino et al. 2007;Elinson and del Pino2012).Gastrulation characteristics vary among frogs according to their developmental speed.Gas trulation and body elongation, as detected by the speed.Gastrulation and body elongation, overlapped in embryos of X.laevis,C.stolmanni,E.