title: Is ventral in insects dorsal in vertebrates? : A history of embryological arguments favouring axis inversion in chordate ancestors.
authors.affiliation: Biologisches Institut I (Zoologie), Albertstrasse 21 a, D-79104, Freiburg, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Nübler-Jung
authors.affiliation: Biologisches Institut I (Zoologie), Albertstrasse 21 a, D-79104, Freiburg, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Arendt
keywords: Animal body plans; Annelid hypothesis; Chordate evolution; La querelle des analogues (1830); Unité de plan