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Title: Biology/Zoology/Chordates - Breathing in Stegocephalians Most tetrapods breathe with the lungs that they inherited from their ancestors such as the coelacanth and lungfishes and this is probably also true of extinct groups of stegocephalians.

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Breathing in Stegocephalians Note

Breathing in Stegocephalians

Michel Laurin Breathing can only be studied indirectly in extinct groups of stegocephalians, but we can infer that most had lungs, like lungfishes, some actinopterygians (Polypterus), and most tetrapods. In addition to this, some groups had larvae with external gills (temnospondyls, seymouriamorphs), although the s appear to have lost these structures. Cutaneous respiration may have been possible in a few groups, but it was probably not widespread because many stegocephalians were too large for this mechanism to work well, and most were covered in bony scales that would have interfered with gas exchange. Most tetrapods breathe with the lungs that they inherited from their sarcopterygian ancestors (lobe-finned fishes such as the coelacanth and lungfishes). However, other respiratory structures also exist in lissamphibians, and a few salamanders have even lost their lungs (Duellman and Trueb, 1986). Other respiratory structures include external gills (present in several salamanders and larval amphibians), the skin (in many lissamphibians), and the buccopharyngeal cavity (in some frogs). Amniotes have fewer respiratory structures, but some turtles can use buccopharyngeal breathing to remain submerged for long periods of time (Goin, Goin, and Zug, 1978).

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Figure 1. The plethontid salamander Ensatina eschscholtzi. Plethodontids have no lungs; their gas exchange is accomplished by buccopharyngeal and cutaneous breathing. Picture copyright � 1996, Charles Brown. References Duellman, W. E. & L. Trueb. 1986. Biology of Amphibians. New York: McGraw-Hill. Goin, C. J., O. B. Goin, & G. R. Zug. 1978. Introduction to herpetology. 3 ed., Vol. 1. New York: W. H. Freeman and company. About This Page Michel Laurin

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Most	tetrapods	breathe	with
the	lungs	that	they	inherited
from	their	ancestors	such	as
the	coelacanth	and	lungfishes	and
this	is	probably	also	true
of	extinct	groups	of	stegocephalians.

http://tolweb.org/notes/?note_id=469

Breathing in Stegocephalians 2008 November

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Most tetrapods breathe with the lungs that they inherited from their ancestors such as the coelacanth and lungfishes and this is probably also true of extinct groups of stegocephalians.

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