title: [Quantitative analysis of the teleost brain: evolutionary and adaptive characteristics of encephalization. III. Multivariate analysis of the cephalic index].
abstract: A multivariate analysis of 9 brain indices from 83 teleost species showed a marked opposition between the non-olfactory telencephalon (and diencephalon) and the medulla oblongata (phylogenetic characters) and between the olfactory bulbs and the optic tectum (adaptive characters). Results of three different classifying algorithms allowed determination of 6 stable groupings and 9 intermediate ones, some with systematic importance and some purely adaptive. For this reason brain organization criteria must be used with precaution for systematic purposes. Nevertheless, the position of Brotula multibarbata showed that this fish is an evolved acanthopterygian.
authors.affiliation: Laboratoire d'Anatomie Comparée, Université Paris, France.
authors.forename: J M
authors.initials: JM
authors.lastname: Ridet
authors.forename: R
authors.initials: R
authors.lastname: Bauchot
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology*; D000465:Algorithms; D000818:Animals; D005075:Biological Evolution; D001921:Brain / Q000254:growth & development / Q000502:physiology*; D005399:Fishes / Q000145:classification / Q000502:physiology*; D015999:Multivariate Analysis; D013045:Species Specificity
vernacular_title: Analyse quantitative de l'encéphale des téléostéens: caractères évolutifs et adaptatifs de l'encéphalisation. III. Analyse multivariée des indices encéphaliques.