Anomalies in the developing neural and visceral head skeleton of the Australian lungfish, Neoceratodus forsteri

Kemp, A (2003) Anomalies in the developing neural and visceral head skeleton of the Australian lungfish, Neoceratodus forsteri. Annals of Anatomy-anatomischer Anzeiger, 185 2: 121-134.


Author Kemp, A
Title Anomalies in the developing neural and visceral head skeleton of the Australian lungfish, Neoceratodus forsteri
Journal name Annals of Anatomy-anatomischer Anzeiger   Check publisher's open access policy
ISSN 0940-9602
Publication date 2003
Sub-type Article (original research)
DOI 10.1016/S0940-9602(03)80076-6
Volume 185
Issue 2
Start page 121
End page 134
Total pages 14
Place of publication Jena
Publisher Urban and Fischer Verlag
Collection year 2003
Language eng
Subject C1
270503 Animal Anatomy and Histology
780105 Biological sciences
Abstract Several anomalies occur in the developing neural and visceral head skeleton of young specimens of Neoceratodus forsteri that have been reared under laboratory conditions. These include anomalies of the basicranium and its derivatives, aberrations of the anterior mandible and hyoid apparatus, and abnormalities in the articulation of the jaws and the elements that produce them. Apart from the occasional absence of the basihyal, and failure of the quadrate processes to form, the anomalies are not deficiencies. Most involve malformations of parts of the neurocranium and visceral skeleton, inappropriate articulations or fusions between elements, disunity in structures that are normally fused and the appearance of supernumerary elements. The incidence of chondral anomalies, generally higher than aberrations that occur in the dermal skeleton in juvenile lungfish, ranges from 1-10% in laboratory reared individuals that have not been subjected to experimental interference. The anomalies differ from those found in many amphibian populations, in the field and in the laboratory, because they involve the cranium, and not the limbs, and the lungfish have not been exposed to the factors that cause anomalies in the amphibians. It is unlikely that the existence of those anomalies, if it is reflected in the wild population, places a selective pressure on the lungfish, because, in a normal season, less than 1% of the total number of eggs produced survive to be recruited into the adult population.
Keyword Anatomy & Morphology
Chondral Skeleton
Visceral Skeleton
Lungfish
Anomalies
Ontogeny
Lower Jaw
Dipnoi
Osteichthyes
Tadpoles
Skull
Malformations
Embryos
Fossil
Bones
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2004 Higher Education Research Data Collection
Centre for Microscopy and Microanalysis Publications
 
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Created: Tue, 14 Aug 2007, 19:07:03 EST