Abstract
Summary In Japanese toads, B. torrenticola, B. japonicus and their hybrids the cerebral hemisphere patterns were quantitatively studied. The posterior portion of pallium is less developed in B. torrenticola as a relict-like species than in B. japonicus as a advanced toad. The developmental degrees of the posterior portion of pallium in hybrids are intermediate between that of parental species, and furthermore, tend towards maternal side. Zusammenfassung Muster der Groshirnhemispharen von Hybriden, die durch kunstliche Kreuzungen zwischen Bufo torrenticola, einer neuen Art, und Bufo bufo japonicus erzeugt wurden Bei japanischen Kroten, B. torrenticola, B. japonicus und ihren Hybriden wurden die Muster der Groshirnhemispharen quantitativ studiert. Der hintere Abschnitt des Palliums von B. torrenticola, als reliktahnlicher Art, ist weniger entwickelt, im Vergleich zu B. japonicus, einer hoher evoluierten Art. Die Enrwicklungsgrade des hinteren Abschnitts des Palliums sind bei den Hybriden intermediar zwischen den elterlichen Arten, sie neigen zur mutterlichen Seite.
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