Morphological diversity and evolution of the spermatozoon in the mouse-related clade of rodents
Article first published online: 14 DEC 2013
Copyright © 2013 Wiley Periodicals, Inc.
Journal of Morphology
Volume 275, Issue 5, pages 540–547, May 2014
How to Cite
Breed, W. G., Leigh, C. M., Aplin, K. P., Shahin, A. A.B. and Avenant, N. L. (2014), Morphological diversity and evolution of the spermatozoon in the mouse-related clade of rodents. J. Morphol., 275: 540–547. doi: 10.1002/jmor.20236
- Issue published online: 10 APR 2014
- Article first published online: 14 DEC 2013
- Manuscript Accepted: 24 NOV 2013
- Manuscript Revised: 21 OCT 2013
- Manuscript Received: 3 APR 2013
Vol. 275, Issue 7, 840, Article first published online: 14 MAY 2014
- sperm evolution;
Most species in the three highly speciose families of the mouse-related clade of rodents, the Muridae, Cricetidae, and Nesomyidae (superfamily Muroidea), have a highly complex sperm head in which there is an apical hook but there are few data available for the other related families of these rodents. In the current study, using light and electron microscopies, we investigated the structure of the spermatozoon in representative species of four other families within the mouse-related clade, the Dipodidae, Spalacidae, Pedetidae, and Heteromyidae, that diverged at or near the base of the muroid lineage. Our results indicate that a diverse array of sperm head shapes and tail lengths occurs but none of the species in the families Spalacidae, Dipodidae, or Pedetidae has a sperm head with an apical hook. By contrast, a rostrally extending apical hook is present in spermatozoa of members of the Family Heteromyidae which also invariably have comparatively long sperm tails. These findings suggest that the hook-shaped sperm head in the murid, cricetid, and nesomyid rodents evolved after divergence of this lineage from its common ancestor with the other families of the mouse-related clade, and that separate, and independent, convergent evolution of a similar sperm head form, and long sperm tail, occurred in the Heteromyidae. J. Morphol. 275:540–547, 2014. © 2013 Wiley Periodicals, Inc.