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First molecular data on the Western Australian Diacyclops (Copepoda, Cyclopoida) confirm morpho-species but question size differentiation and monophyly of the Alticola-group


Karanovic, T and Krajicek, M, First molecular data on the Western Australian Diacyclops (Copepoda, Cyclopoida) confirm morpho-species but question size differentiation and monophyly of the Alticola-group, Crustaceana, 85, (12-13) pp. 1549-1569. ISSN 0011-216X (2012) [Refereed Article]

Copyright Statement

Copyright 2012 Koninklijke Brill NV

DOI: doi:10.1163/156854012X651709


Size differentiation has been considered an important phenomenon in evolution, and in situ speciation was hypothesized in the past for the parapatric subterranean Western Australian Diacyclops Kiefer, 1927 species from the alticola-group, based on morphological evidence. Aims of this study are to: derive their preliminary molecular phylogenies based on mitochondrial (12S) and nuclear (18S) genes; test if morpho-species are supported by molecular data; examine monophyly of the alticola-group; and test whether the size differences evolved in situ after colonization by a single ancestral species or resulted from different phylogeny. Analyses of the 12S sequences reveal at least six well defined clades, each corresponding to one morpho-species. The divergences are very high between all species, suggesting only a remote relationship, with those between sympatric species with significant size difference being in excess of 27%. Surprisingly, all analyses show very high bootstrap values for the clade formed by two cosmopolitan surface-water species, Diacyclops bisetosus (Rehberg, 1880) and D. bicuspidatus (Claus, 1857), despite numerous morphological differences. The 18S dataset also supports only a remote relationship between Diacyclops scanloni Karanovic, 2006 and two other Western Australian members of the alticola-group: D. humphreysi s. str. Pesce & De Laurentiis, 1996 and D. sobeprolatus Karanovic, 2006. Preliminary analyses suggest absence of in situ speciation and parallel evolution in the Western Australian Diacyclops, interspecific size differentiation being a result of different phylogeny. The alticola-group may be polyphyletic, and we recognize morphological characters that define two main lineages. A possibility of cryptic speciation in the cosmopolitan D. bisetosus is also suggested, and several sequences of Diacyclops available from GenBank are recognized either as contamination or misidentification.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Evolutionary biology
Research Field:Host-parasite interactions
Objective Division:Environmental Management
Objective Group:Other environmental management
Objective Field:Other environmental management not elsewhere classified
UTAS Author:Karanovic, T (Dr Tomislav Karanovic)
ID Code:83709
Year Published:2012
Web of Science® Times Cited:15
Deposited By:IMAS Research and Education Centre
Deposited On:2013-03-21
Last Modified:2017-10-31

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