Books  Palaeontology  Palaeozoology & Extinctions 

Acanthostega gunnari: a Devonian Tetrapod from Greenland: the Snout

Monograph

Series: Geoscience (Monographs on Greenland subseries) Volume: 31

By: Jennifer A Clack (Author)

24 pages, illustrations

Museum Tusculanum Press, University of Copenhagen

Paperback | Jan 1994 | #211710 | ISBN: 8763512238
Availability: Usually dispatched within 1-2 weeks Details
NHBS Price: £24.99 $32/€29 approx

About this book

The snout, including the naris and choana, and the palata, ventral parts of the braincase and suspensorium of Acanthostega gunnari are described from three-dimensional specimens and sections. The naris is low on the snout, and the choana and vomerine dentition resemble those of osteolepiform fishes. The braincase is ossified in two portions in ventral view, with the ventral cranial fissure still evident. Dorsally, however, the otic region and sphenethmoid are co-ossified, so there was no movement possible between them.

The palate is "closed" as in osteolepiforms and primitive tetrapods, and the parasphenoid is grooved as in some osteolepiforms. It is argued that the low naris and divided braincase represent the primitive condition for tetrapods, and that the condition of the naris and choana most closely resemble those of panderichttyiid fishes among sarcopterygians.


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