A novel Phytophthora species was frequently recovered from irrigation reservoirs at several ornamental plant production facilities in eastern Virginia. Initial sequencing of the internal transcribed spacer (ITS) region of this species generated unreadable sequences due to continual polymorphic positions. Cloning and sequencing the ITS region as well as sequencing the mitochondrially encoded cyt...

in the alhambra (granada, spain), and in other moorish locations, several individuals of the original variety of myrtle, the emblematic plant of their gardens, have been identified and genetically authenticated. after microsatellite analysis, we differentiated between the wild form (myrtus communis l.) and two cultivated varieties: the one original to the alhambra, the moorish myrtle (subsp. ba...

Over the past two decades, there has been a long-standing debate about the impact of taxon sampling on phylogenetic inference. Studies have been based on both real and simulated data sets, within actual and theoretical contexts, and using different inference methods, to study the impact of taxon sampling. In some cases, conflicting conclusions have been drawn for the same data set. The main que...

A new eureptile, Concordia cunninghami, gen. et sp. nov., is described from the Upper Pennsylvanian Hamilton-Fossillagerstätte, Kansas, U.S.A. The new taxon is currently known on the basis of two well-preserved skulls. A phylogenetic analysis groups Concordia consistently with captorhinids; the holotype, therefore, can be regarded as the oldest record of a captorhinid reptile, and the first one...

The constant accumulation of sequence data poses new computational and methodological challenges for phylogenetic inference, since multiple sequence alignments grow both in the horizontal (number of base pairs, phylogenomic alignments) as well as vertical (number of taxa) dimension. Put aside the ongoing controversial discussion about appropriate models, partitioning schemes, and assembly metho...

Taxometric method, invented by Paul Meehl (1965) and developed by him and a number of colleagues, is a family of procedure for subjecting parts of a certain class of theories to risky tests. The theories in question postulate the existence of a latent category, the taxon, and its complement class. A taxon is negatively defined as a " non-arbitrary latent category. " It does not appear to be pos...

A new apterous aradid, Paramorphocoris henanensis Bai & Heiss Cai, gen. et sp. nov., from China is described and illustrated, including the diagnostic morphological features of the new taxon.