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On the Palatoquadrate and Hyomandibula of Pleuracanthus sessilis Jordan

Published online by Cambridge University Press:  01 May 2009

J. A. Moy-Thomas  and
E. I. White
J. A. Moy-Thomas
Affiliation:
Dept. of Zoology and Comparative Anatomy, Oxford
E. I. White
Affiliation:
British Museum (Natural History).
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Extract

Watson (1937) in his important work on Acanthodians demonstrated that the mode of jaw-suspension of this group and probably also that of the Arthrodira.Macropetalichthyida, Rhenanida, and Antiarchi was in a more primitive condition than in other Gnathostomes. The hyomandibula of these fishes played no important part in the suspension of the jaws, and the hyoidean gill-slit persisted as such, not being reduced to a spiracle. Watson introduced the name Aphetohyoidea (free hyoid) for the group containing all these fishes, distinguishing them from the more advanced Chondrichthyes and Osteichthyes.

Type
Original Articles
Information
Geological Magazine , Volume 76 , Issue 10 , October 1939 , pp. 459 - 463
Copyright
Copyright © Cambridge University Press 1939

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References

REFERENCES

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Watson, D. M. S., 1937. “The Acanthodian Fishes,” Phil. Trans. Roy. Soc., London (B), cxxviii, 49–146.Google Scholar