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Developmental and Functional Aspects of the Frontal Bones in Relation To Some Other Bony and Cartilaginous Parts of the Head Roof in Haplochromis Elegans Trewavas, 1933 (Teleostei, Cichlidae)

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

In this paper the development of the frontal bones in the acanthopterygian Haplochromis elegans is described and compared to that of the protacanthopterygian Salmo gairdneri (rainbow trout). It is stated that in H. elegans the development of the frontal bones starts earlier with regard to the development of the chondrocranium than in S. gairdneri. In both cases, however, the development of these bones starts in parachondral position. The relation between the degree of development of the cartilaginous skull roof and the overlapping of both frontals in the midline during ontogeny, is discussed. The complicated structure of the frontal lamellae consisting of three different levels is understood in relation to the attachment to the chondrocranium and to the support for the rostral dorsal head scales.

Affiliations: 1: (Laboratorium voor Morfologie en Systematiek der Dieren, Rijksuniversiteit Gent, Gent, Belgium


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