Ontogeny, variation, and homology in Salvelinus alpinus caudal skeleton (Teleostei: Salmonidae)
Version of Record online: 14 JUL 2009
Copyright © 2009 Wiley-Liss, Inc.
Journal of Morphology
Volume 271, Issue 1, pages 12–24, January 2010
How to Cite
Grünbaum, T. and Cloutier, R. (2010), Ontogeny, variation, and homology in Salvelinus alpinus caudal skeleton (Teleostei: Salmonidae). J. Morphol., 271: 12–24. doi: 10.1002/jmor.10775
- Issue online: 8 DEC 2009
- Version of Record online: 14 JUL 2009
- Manuscript Accepted: 10 MAY 2009
- Manuscript Revised: 8 APR 2009
- Manuscript Received: 4 DEC 2008
- Natural Sciences and Engineering Research Council of Canada discovery. Grant Number: NSERC: 238612
- polyural condition;
The ontogeny of the caudal skeleton in the Arctic charr, Salvelinus alpinus was examined using an extensive series of cleared and stained specimens. We demonstrate the presence of skeletal components never reported previously within the Salmonidae. In contrast to the generalized condition for salmonids, seven hypurals (instead of six), and four uroneurals (instead of three) have been found in some specimens. Variation in the number and condition of epurals is documented. New hypotheses are proposed concerning (1) relationships among centra and their associated elements, (2) phylogenetic distribution of caudal characters within the Salmonidae, and (3) homology of caudal components. Using the published phylogenetic hypotheses, we provide evidence, that a seventh hypural and a fourth uroneural are taxic atavism in salmonids. The development of the salmonid homocercal fin is discussed in the light of a polyural scheme based on evidences of a one-to-one relationship among ural centra and their associated elements. J. Morphol., 2010. © 2009 Wiley-Liss, Inc.