Department of Biology, Duke University, Box 90325, Durham, NC 27707-0325 U.S.A.
Extensive Robertsonian rearrangement: implications for the radiation and biogeography of Planipapillus Reid (Onychophora: Peripatopsidae)
Article first published online: 28 FEB 2006
Journal of Zoology
Volume 257, Issue 2, pages 171–179, June 2002
How to Cite
Rowell, D. M., Rockman, M. V. and Tait, N. N. (2002), Extensive Robertsonian rearrangement: implications for the radiation and biogeography of Planipapillus Reid (Onychophora: Peripatopsidae). Journal of Zoology, 257: 171–179. doi: 10.1017/S0952836902000778
- Issue published online: 28 FEB 2006
- Article first published online: 28 FEB 2006
- Accepted 4 June 2001
- Centric fusion;
- Robertsonian rearrangement;
- chromosomal speciation;
The remarkable diversity in chromosome number within Planipapillus Reid 1996, the most speciose genus of peripatopsid onychophorans, centred in the alpine region of south-eastern Australia is documented. Robertsonian, whole-arm rearrangements account for the twofold range of diploid numbers in Planipapillus. Ooperipatellus Ruhberg 1985, another clade of oviparous onychophorans, shows a very different pattern, with no karyotypic diversity among species from Australia and New Zealand. Rate constancy in chromosomal evolution among peripatopsid genera would indicate an ancient radiation in Planipapillus, with extant species representing relictual survivors of more recent Pleistocene climatic upheavals. Conversely, if the rearrangements in Planipapillus are the result of recent and rapid karyotypic restructuring, the karyotypic and species diversity within the genus may be attributed to recent population fragmentation and isolation resulting from the repeated glaciation and warming cycles of the Pleistocene rather than stemming from a more ancient radiation. Data from other animal groups support a model of accelerated rates of Robertsonian centric fusions concordant with a recent radiation in Planipapillus. Karyotype change may be an important factor in the generation and maintenance of Planipapillus diversity.