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Structural details of Early Devonian dipnoans

Structural details of Early Devonian dipnoans The evolution of the Dipnoi is displayed in the Early Devonian in south-eastern Australia. The main points at issue are as follows. (a) The development of the tubercles in the two-layered rostral region of the skull. (b) The nerves ophthalmicus profundus V and opthalmicus superficialis VII, and their sensory function. (c) The abundance of fine tubules between these tubules and the dermal plates of the skull roof extending posterior to the pineal region. (d) The massive pterygoids and the restriction of the parasphenoids to a small posterior position. (e) The position of the bucco-hypophysial canal running to a buccal opening near the posterior of the pterygoids. (f) The presence of a rostral region, misnamed the dentary, in the mandible, with abundant tubercles serving sensory systems. (g) The presence of an anterior furrow in the mandible. Dipnoans form a separate evolutionary lineage that began in the Early Devonian. Diabolepis and associated genera are not Dipnomorphs, but are isolated genera formed by gene regulation in the early Devonian. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Australian Journal of Zoology CSIRO Publishing

Structural details of Early Devonian dipnoans

Campbell, K. S. W.; Wragg, Sharyn
Australian Journal of Zoology , Volume 62 (1): 8 – Jan 8, 2014
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Publisher
CSIRO Publishing
Copyright
Copyright © The Author(s). Published by CSIRO Publishing
ISSN
0004-959X
eISSN
1446-5698
DOI
10.1071/ZO13055
Publisher site
See Article on Publisher Site

Abstract

The evolution of the Dipnoi is displayed in the Early Devonian in south-eastern Australia. The main points at issue are as follows. (a) The development of the tubercles in the two-layered rostral region of the skull. (b) The nerves ophthalmicus profundus V and opthalmicus superficialis VII, and their sensory function. (c) The abundance of fine tubules between these tubules and the dermal plates of the skull roof extending posterior to the pineal region. (d) The massive pterygoids and the restriction of the parasphenoids to a small posterior position. (e) The position of the bucco-hypophysial canal running to a buccal opening near the posterior of the pterygoids. (f) The presence of a rostral region, misnamed the dentary, in the mandible, with abundant tubercles serving sensory systems. (g) The presence of an anterior furrow in the mandible. Dipnoans form a separate evolutionary lineage that began in the Early Devonian. Diabolepis and associated genera are not Dipnomorphs, but are isolated genera formed by gene regulation in the early Devonian.

Journal

Australian Journal of Zoology – CSIRO Publishing

Published: Jan 8, 2014

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