Recent and rapid speciation with limited morphological disparity in the genus Rattus.

Recent and rapid radiations provide rich material to examine the factors that drive speciation. Most recent and rapid radiations that have been well-characterized involve species that exhibit overt ecomorphological differences associated with clear partitioning of ecological niches in sympatry. The most diverse genus of rodents, Rattus (66 species), evolved fairly recently, but without overt ecomorphological divergence among species.

Nuclear ribosomal pseudogenes resolve a corroborated monophyly of the eucalypt genus Corymbia despite misleading hypotheses at functional ITS paralogs.

Divergent paralogs can create both obstacles and opportunities for phylogenetic reconstruction. Phylogenetic relationships among eucalypt genera have been incongruent among datasets in previous studies, where morphological characters supported monophyly of the genus Corymbia, while intergenic spacers of the nuclear ribosomes (ITS) and chloroplast loci (trnL, trnH, psbA) showed Corymbia as either equivocal or paraphyletic. Ribosomal DNA occurs in multiple copies in a genome.