title: Molecular phylogeny of Cryptocercus wood-roaches based on mitochondrial COII and 16S sequences, and chromosome numbers in Palearctic representatives.
abstract: Woodroaches of the genus Cryptocercus are subsocial and xylophagous cockroaches, distributed in North America and Asia. Studies on male chromosome number in Nearctic species have shown that diploid numbers vary from 2n=37 to 2n=47; numbers from Palearctic species were heretofore unknown. Two hypotheses have been proposed to explain the varying number of chromosomes among Nearctic species: the serial reduction hypothesis, and the parallel scenario. We performed phylogenetic analyses of the COII gene in these species and found evidence for the topology (47(45(43(39,37), which is congruent with the serial reduction hypothesis. We also determined chromosome numbers for the first time in Palearctic species, and found Cryptocercus primarius and Cryptocercus relictus to have relatively low chromosome numbers (2n=17-21) compared to their Nearctic relatives. Finally, our study determined the phylogenetic position of Cryptocercus primarius among other Asian taxa.
authors.affiliation: School of Biological Sciences, The University of Sydney, NSW, Australia. nathan@usyd.edu.au
authors.forename: Nathan
authors.initials: N
authors.lastname: Lo
authors.forename: Peter
authors.initials: P
authors.lastname: Luykx
authors.forename: Rossana
authors.initials: R
authors.lastname: Santoni
authors.forename: Tiziana
authors.initials: T
authors.lastname: Beninati
authors.forename: Claudio
authors.initials: C
authors.lastname: Bandi
authors.forename: Maurizio
authors.initials: M
authors.lastname: Casiraghi
authors.forename: Wen-hua
authors.initials: WH
authors.lastname: Lu
authors.forename: Evgueni V
authors.initials: EV
authors.lastname: Zakharov
authors.forename: Christine A
authors.initials: CA
authors.lastname: Nalepa
mesh_terms: D000818:Animals; D002875:Chromosomes / Q000235:genetics*; D003058:Cockroaches / Q000145:classification* / Q000235:genetics*; D017931:DNA Primers / Q000737:chemistry; D004272:DNA, Mitochondrial / Q000737:chemistry*; D003576:Electron Transport Complex IV / Q000235:genetics*; D005843:Geography; D007621:Karyotyping / Q000379:methods; D008969:Molecular Sequence Data; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics*; D013045:Species Specificity
chemical_list: D017931:DNA Primers; D004272:DNA, Mitochondrial; D012336:RNA, Ribosomal, 16S; D003576:Electron Transport Complex IV