Histological structure of the cancellous bone layer in Bothriolepis canadensis (Antiarchi, Placodermi)

Burrow, C. J. (2005) Histological structure of the cancellous bone layer in Bothriolepis canadensis (Antiarchi, Placodermi). Lethaia, 38 3: 205-210. doi:10.1080/00241160510013286


Author Burrow, C. J.
Title Histological structure of the cancellous bone layer in Bothriolepis canadensis (Antiarchi, Placodermi)
Journal name Lethaia   Check publisher's open access policy
ISSN 0024-1164
Publication date 2005
Sub-type Article (original research)
DOI 10.1080/00241160510013286
Volume 38
Issue 3
Start page 205
End page 210
Total pages 6
Editor David T Harper
Jan a Rasmussen
Svend Stouge
Place of publication Oslo
Publisher Taylor & Francis As
Collection year 2005
Language eng
Subject C1
270799 Ecology and Evolution not elsewhere classified
780105 Biological sciences
0699 Other Biological Sciences
Abstract The Placodermi are extinct basal gnathostomes which had extensive dermal and perichondral bone, but which lacked the endochondral bone which characterizes the more derived bony fishes. Thin sections of bone from a specimen of the antiarch placoderm Bothriolepis canadensis, from the Escuminac Formation ( Frasnian, Upper Devonian), Quebec, Canada, reveal that part of the cancellous layer in its dermal and endoskeletal bone formed from perichondral bone trabeculae growing around cartilage spheres. The resultant structure mimics that of osteichthyan endochondral bone. The layout and dimensions of this polygonal mosaic patterning of the bone trabeculae and flattened cartilage spheres resemble those of the prismatic layers of calcified cartilage in chondrichthyans. If the lack of endoskeletal bone in chondrichthyans is a derived character, then the structure identified in B. canadensis could represent a 'template' for the formation of prismatic calcified cartilage in the absence of bone.
Keyword Paleontology
calcified cartilage
Escuminac Formation
perichondral bone
Placodermi
Sharks
Chondrichthyes
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2006 Higher Education Research Data Collection
School of Biological Sciences Publications
 
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Created: Wed, 15 Aug 2007, 05:47:07 EST