The present study was undertaken to prepare a detailed and up to date atlas of the entire brain of a highly evolted teleost fish species, the antherinomorph swordtail fish XIPHOPHORUS HELLERI. Additionally, atlases of the entire brains of several larval stages are given to provide data for further investigations that may be focused on the time course of the embryonic development of a teleost's brain. The study also provides data about the ontogenetic development of the gravity-related neuronal integration centers.Der Atlas behandelt die Neuro-Anatomie des Gehirns von Xiphophorus helleri (Schwertträger), untersucht beim adulten Fisch und bei verschiedenen Stadien der Entwicklung.