The amphibian chorda-mesoderm. A semantic puzzle.
D000663:Amphibians / Q000196:embryology*; D000818:Animals; D001001:Anura / Q000196:embryology; D001755:Blastocyst / Q000033:anatomy & histology; D004475:Ectoderm / Q000033:anatomy & histology; D004625:Embryo, Nonmammalian / Q000033:anatomy & histology*; D004707:Endoderm / Q000033:anatomy & histology; D008648:Mesoderm / Q000033:anatomy & histology*; D009672:Notochord / Q000033:anatomy & histology*; D009626:Terminology as Topic; D014562:Caudata / Q000196:embryology