Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Developmental Aspects of the Pharyngeal Jaws in Astatotilapia Elegans (Trewavas, 1933) (Teleostei: Cichlidae)

Developmental Aspects of the Pharyngeal Jaws in Astatotilapia Elegans (Trewavas, 1933)... DEVELOPMENTAL ASPECTS OF THE PHARYNGEAL JAWS IN ASTATOTILAPIA ELEGANS (TREWAVAS, 1933) (TELEOSTEI: CICHLIDAE) by M. H. ISMAIL, W. VERRAES and A. HUYSSEUNE* (Laboratorium voor Morfologie en Systematiek der Dieren, Rijksuniversiteit Gent, Belgium) SUMMARY The present study deals with the development of the skeletal elements of the phar- yngeal jaw apparatus and their articulation with the neurocranium in a generalized haplochromine species, Astatotilapia elegans ( = Haplochromis elegans). Problems of the homology of the elements constituting the upper pharyngeal jaws are discussed. In early developmental stages the paired articular facets of the neurocranial apo- physis are formed by the parasphenoid bone. During further development the basi- occipital bone grows anteriorly and the surface area of each articular facet increases. We hypothesize that the bone-like material on the upper pharyngeal jaws and skull base apophysis is deposited by calcification of a type of adventitious cartilage. INTRODUCTION Cichlid fishes represent a group of acanthopterygians in which the pharyngeal jaw apparatus is considered as an important evolutionary feature, responsible in part for their extraordinary success in the Great Lakes of East Africa (FRYER & ILES, 1972; LIEM, 1973; GREENWOOD, 1974; LIEM & OSSE, 1975; LIEM & GREENWOOD, 1981). Some authors believed that http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Netherlands Journal of Zoology (in 2003 continued as Animal Biology) Brill

Developmental Aspects of the Pharyngeal Jaws in Astatotilapia Elegans (Trewavas, 1933) (Teleostei: Cichlidae)

Download PDF
31 pages

Loading next page...
 
/lp/brill/developmental-aspects-of-the-pharyngeal-jaws-in-astatotilapia-elegans-Q4u4kIBZXi

References

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
Brill
Copyright
© 1981 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0028-2960
eISSN
1568-542X
DOI
10.1163/002829682X00201
Publisher site
See Article on Publisher Site

Abstract

DEVELOPMENTAL ASPECTS OF THE PHARYNGEAL JAWS IN ASTATOTILAPIA ELEGANS (TREWAVAS, 1933) (TELEOSTEI: CICHLIDAE) by M. H. ISMAIL, W. VERRAES and A. HUYSSEUNE* (Laboratorium voor Morfologie en Systematiek der Dieren, Rijksuniversiteit Gent, Belgium) SUMMARY The present study deals with the development of the skeletal elements of the phar- yngeal jaw apparatus and their articulation with the neurocranium in a generalized haplochromine species, Astatotilapia elegans ( = Haplochromis elegans). Problems of the homology of the elements constituting the upper pharyngeal jaws are discussed. In early developmental stages the paired articular facets of the neurocranial apo- physis are formed by the parasphenoid bone. During further development the basi- occipital bone grows anteriorly and the surface area of each articular facet increases. We hypothesize that the bone-like material on the upper pharyngeal jaws and skull base apophysis is deposited by calcification of a type of adventitious cartilage. INTRODUCTION Cichlid fishes represent a group of acanthopterygians in which the pharyngeal jaw apparatus is considered as an important evolutionary feature, responsible in part for their extraordinary success in the Great Lakes of East Africa (FRYER & ILES, 1972; LIEM, 1973; GREENWOOD, 1974; LIEM & OSSE, 1975; LIEM & GREENWOOD, 1981). Some authors believed that

Journal

Netherlands Journal of Zoology (in 2003 continued as Animal Biology) – Brill

Published: Jan 1, 1981

There are no references for this article.