title: Haeckel's embryos.
authors.forename: J
authors.initials: J
authors.lastname: Hanken
authors.forename: M K
authors.initials: MK
authors.lastname: Richardson
mesh_terms: D000818:Animals; D004622:Embryo, Mammalian / Q000033:anatomy & histology*; D004625:Embryo, Nonmammalian / Q000033:anatomy & histology*; D014714:Vertebrates / Q000033:anatomy & histology / Q000196:embryology*