The Ancestry of Modern Amphibia: A Review of the Evidence

The Ancestry of Modern Amphibia: A Review of the Evidence [Transcriber's Notes: Several typos have been regulated....
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SKU: gb-37350-ebook
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Author: Eaton, Theodore H. (Theodore Hildreth),1907-1981
Format: eBook
Language: English
Subtotal: €6,27
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The Ancestry of Modern Amphibia: A Review of the Evidence

The Ancestry of Modern Amphibia: A Review of the Evidence

€6,27

The Ancestry of Modern Amphibia: A Review of the Evidence

€6,27
Author: Eaton, Theodore H. (Theodore Hildreth),1907-1981
Format: eBook
Language: English

The Ancestry of Modern Amphibia: A Review of the Evidence

[Transcriber's Notes: Several typos have been regulated. One typo of "ancester" for "ancestor" was corrected. One instance of "salamanderlike" corrected to "salamander-like". The captions on some images give relative size. Due to differences in monitor size/resolution, do not consider the images to be scalable.] In trying to determine the ancestral relationships of modern orders of Amphibia it is not possible to select satisfactory structural ancestors among a wealth of fossils, since very few of the known fossils could even be considered possible, and scarcely any are satisfactory, for such a selection. The nearest approach thus far to a solution of the problem in this manner has been made with reference to the Anura. Watson's paper (1940), with certain modifications made necessary by Gregory (1950), provides the paleontological evidence so far available on the origin of frogs. It shows that several features of the skeleton of frogs, such as the enlargement of the interpterygoid spaces and orbits, reduction of the more posterior dermal bones of the skull, and downward spread of the neural arches lateral to the notochord, were already apparent in the Pennsylvanian Amphibamus (Fig. 1), with which Gregory synonymized Miobatrachus and Mazonerpeton. But between the Pennsylvanian and the Triassic (the age of the earliest known frog, Protobatrachus) there was a great lapse of time, and that which passed between any conceivable Paleozoic ancestor of Urodela and the earliest satisfactory representative of this order (in the Cretaceous) was much longer still. The Apoda, so far as known, have no fossil record. ......Buy Now (To Read More)

Product details

Ebook Number: 37350
Author: Eaton, Theodore H. (Theodore Hildreth)
Release Date: Sep 8, 2011
Format: eBook
Language: English

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