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Clack, J. A.
Acanthostega gunnari, a Devonian tetrapod from Greenland; the snout, palate and ventral parts of the braincase, with a discussion of their significance
1994, 24 sider
Illustreret
19 x 26,5 cm
ISBN 978-87-635-1223-7
Serie:
Monographs on Greenland | Meddelelser om Grønland, vol. 298
ISSN 0025-6676
Serie:
Geoscience, vol. 31
ISSN 0106-1046
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Vejl. pris80 DKK 12 $ 11 € 10 £
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Onlinepris64 DKK 10 $ 9 € 8 £
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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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