Formation and structure of scales in the Australian lungfish, neoceratodus forsteri (Osteichthyes: Dipnoi)

Kemp, Anne (2012) Formation and structure of scales in the Australian lungfish, neoceratodus forsteri (Osteichthyes: Dipnoi). Journal of Morphology, 273 5: 530-540. doi:10.1002/jmor.11039


Author Kemp, Anne
Title Formation and structure of scales in the Australian lungfish, neoceratodus forsteri (Osteichthyes: Dipnoi)
Formatted title
Formation and structure of scales in the Australian lungfish, neoceratodus forsteri (Osteichthyes: Dipnoi)
Journal name Journal of Morphology   Check publisher's open access policy
ISSN 0362-2525
1097-4687
Publication date 2012-05
Year available 2011
Sub-type Article (original research)
DOI 10.1002/jmor.11039
Volume 273
Issue 5
Start page 530
End page 540
Total pages 11
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Collection year 2012
Language eng
Formatted abstract
The large elasmoid scales of the Australian lungfish, Neoceratodusforsteri, are formed within the dermis by unpigmented scleroblasts, growing within a collagenous dermal pocket below a thick glandular epidermis. The first row of scales, on the trunk of the juvenile lungfish, appears below the lateral line of the trunk, single in this species, at around stage 53. The scales, initially circular in outline, develop anteriorly and posteriorly from the point of initiation in the mid-trunk region, and rows are added alternately below the line, and above the line, until they reach the dorsal or ventral midline, or the margins of the fins. Scales develop later on the ventral surface of the head, from a separate centre of initiation. Scales consist of three layers, all produced by scleroblasts of dermal origin. The outermost layer of interlocking plates, or squamulae, consists of a mineralised matrix of fine collagen fibrils, covered by unmineralised collagen and a single layer of cells. Squamulae of the anterior and lateral surfaces are ornamented with short spines, and the mineralised tissue of the posterior surface is linked to the pouch by collagen fibrils. The innermost layer, known as elasmodin, consists of bundles of thick collagen fibrils and cells arranged in layers. An intermediate layer, made up of collagen fibrils, links the outer and inner layers. The elasmoid scales of N. forsteri can be compared with scale types among other osteichthyan groups, although the cellsand canaliculi in the mineralised squamulae bear littleresemblance to typical bone.
Keyword Lungfish scales
Squamulae
Elasmodin
Formation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article first published online: 21 DEC 2011

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Biological Sciences Publications
 
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