Journal
MOLECULAR PHYLOGENETICS AND EVOLUTION
Volume 77, Issue -, Pages 126-135Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ympev.2014.03.015
Keywords
Cryptic species; DNA sequences; Karyotype; Host specificity; Eucalyptus; Speciation
Funding
- Australian Postgraduate Award (APA) scholarship
- Australian Research Council
- Australian Geographic Society
- Linnean Society of New South Wales
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Cryptic species occur within most of the major taxonomic divisions, and a current challenge is to determine why some lineages have more cryptic species than others. It is expected that cryptic species are more common in groups where there are life histories or genetic architectures that promote speciation in the absence of apparent morphological differentiation. Chromosomal rearrangements have the potential to lead to post-zygotic isolation and might be an important factor leading to cryptic species. Here we investigate the potential role of chromosomal change in driving speciation in the karyotypically diverse scale insect genus Apiomorpha, focussing on four species placed in the same species group (the A. minor species group Gullan, 1984). Using mitochondrial and nuclear DNA sequence data, we find that Apiomorpha minor is not monophyletic and consists of at least nine cryptic species. Diploid chromosome counts range from 2n = 4 to 2n = 84 across the four currently recognized species, and some of the chromosomal variation exists in the absence of other genetic or host use differences, consistent with karyotypic changes being involved in lineage divergence and the generation of cryptic species. (C) 2014 Elsevier Inc. All rights reserved.
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