Chapter 27 - Amphibians

Notes for Chapter 27: Early Tetrapods and Modern Amphibians

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Chapter 27 Assignment: 538-548, 556-557; RQ-27: 1-3, 8-9, 12
Next: Ch. 28: 559-571, 576-579; RQ-28: 2-5, 7, 10, 16-17
Then: Ch. 30: 609-621, 624-626, 634-639;
RQ-30: 1-2, 6-8, 11, 15-16 (last two lectures)

Introduction: From Water to Land in Ontogeny and Phylogeny

Source of Image

Featured Animal: Pickeral frog (Rana palustris)
More Links: 1 - 2 - 3 - 4 - 5 - 6

I. Movement onto Land

II. Early Evolution of Terrestrial Vertebrates

A. Devonian Origin of Tetrapods

B. Carboniferous Radiation of Tetrapods

III. Modern Amphibians

A. Caecilians: Gymnophiona

B. Salamanders: Caudata

i. Breeding behavior

ii. Respiration

iii. Paedomorphosis

C. Frogs and Toads: Anura

i. through p. 548

ii. Fig. 27-26: life cycle of frog

The following outline of lecture notes does not follow Ch. 27 headings.

Also note, the text cladogram figures have some problems. Here are more details.

Bony fishes - ray-fin and lobe-fin clades
ray-fins include teleosts (most vertebrates, 96% of fishes)
lobe-fins include coelacanths, lungfish, rhipidistians, and tetrapods
Important fossil tetrapods
- Ichthyostega, Acanthostega
What are tetrapod features and how do they reflect life on land?
Describe 3 types of respiration in a salamander.
What is paedomorphosis? Example: the axolotl

Click link to return to Lecture Schedule
or back to Chapter 26
or ahead to Chapter 28