Cookies Policy

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

The Jaw Mechanism During Growth of a Generalized Haplochromis Species: H. Elegans Trewavas 1933 (Pisces, Cichlidae)

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

Access this article

+ Tax (if applicable)
Add to Favorites
You must be logged in to use this functionality

image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

This paper deals with the jaw mechanism of Haplochromis elegans, a generalized1 Haplochromis2 species. The central issues are the kinematics and statics of the mechanism and the way these are influenced by its proportions. These proportions change during growth and differ in related species. A mathematical computer model is formulated to deal with the kinematics and the statics of the mechanism. A calculation procedure is developed to determine the importance of the position of anatomical points in the mechanism for force-transmission during biting. It is also possible to change the position of all relevant anatomical points gradually and thereby improve the whole mechanism for the function of biting. In this way a prediction is made about the proportions expected in a powerful biting haplochromine species such as H. nigricans. The predictions made are correct in six of the seven specialized proportions of H. nigricans. A simplified kinematical model is presented which demonstrates the essence of protrusion in cichlid fishes and in many other acanthopterygian fishes. The differences in proportions of an adult and a first free-swimming stage of H. elegans are evaluated with the computer model. It appears that some proportions are more favourable for biting in the young stage, others are unfavourable due to the relative size of the eye.

Affiliations: 1: Department of Morphology, Zoological Laboratory, University of Leiden, P. O. Box 9516, 2300 RA Leiden, The Netherlands


Full text loading...


Data & Media loading...

Article metrics loading...



Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to ToC alert
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Your details
    Why are you recommending this title?
    Select reason:
    Netherlands Journal of Zoology — Recommend this title to your library
  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation