Phylogenetic Relationships and Biogeography of the Groundwater-Dwelling Amphipod Genus Pseudoniphargus (Crustacea), with Emphasis on the Iberian Species

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Abstract
Numerical phylogenetic methods are applied in order to arrive at synapomorphic similarities between species of the stygobiont amphipod genus Pseudoniphargus. Character polarity is assessed by comparison with the relevant outgroups Parapseudoniphargus and Allomelita, within a cluster of presumedly interrelated genera of Hadzioidea. Numerical phylogenetic methods are applied in order to arrive at synapomorphic similarities between species of the stygobiont amphipod genus Pseudoniphargus. Character polarity is assessed by comparison with the relevant outgroups Parapseudoniphargus and Allomelita, within a cluster of presumedly interrelated genera of Hadzioidea.