title: Formation of the external skeleton in early jawless vertebrates (Agnatha, Vertebrata).
authors.affiliation: Borissiak Paleontological Institute, Russian Academy of Sciences, ul. Profsoyuznaya 123, Moscow, 117997, Russia.
authors.forename: O B
authors.initials: OB
authors.lastname: Afanassieva
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000033:anatomy & histology*; D005399:Fishes / Q000033:anatomy & histology*; D014714:Vertebrates