Dibranchia

former cephalopod taxon

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In cephalopod: Critical appraisal
…were both placed in the Dibranchia, in contrast to all fossil forms, which were considered as Tetrabranchia because Nautilus has four gills rather than two. This unnatural classification, accepted by the French zoologist Alcide d’Orbigny in 1838, was gradually modified through the efforts of the Swiss zoologist Adolph Naef and…
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