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Document Type

Research

Abstract

In the past there have been many papers presented which have given evidence pointing to a probable origin of air-breathing vertebrates from certain physostomous fishes. The animals to which these papers have referred, apparently have some organ capable of supplementing respiration in times of need. Several of the Dipnoi and Ganoids have been credited with this adaptation and therefore have been responsible for the transition of a large number of vertebrates from water to land. Such a change gives rise to the need for organs capable of respiring atmospheric air.

Publication Date

1927

Journal Title

Proceedings of the Iowa Academy of Science

Volume

34

Issue

1

First Page

335

Last Page

337

Copyright

© Copyright 1927 by the Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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