Records of the Western Australian Museum 25: 329–344 (2009). The first Australasian species of the halophilic pseudoscorpion genus Paraliochthonius (Pseudoscorpiones: Chthoniidae) Mark S. Harvey Department of Terrestrial Zoology, Western Australian Museum, Locked Bag 49, Welshpool DC, Western Australia 6986, Australia. E-mail:
[email protected]. [Research Associate, Division of Invertebrate Zoology, American Museum of Natural History, New York; Research Associate, California Academy of Sciences, San Francisco; Adjunct Professor, School of Animal Biology, University of Western Australia, Crawley, Western Australia 6009, Australia] Abstract – The widespread halophilic genus Paraliochthonius Beier is recorded from Australasia for the first time, and two new species are recorded: P. darwini from tropical northern Australia and P. vachoni from New Caledonia. Paraliochthonius darwini is based upon several adults and a tritonymph, whilst P. vachoni is based on a male and a tritonymph. A key to the species of Paraliochthonius is presented, and the taxonomic status of P. insulae Hoff (from Jamaica), P. puertoricensis Muchmore (from Puerto Rico), P. johnstoni (Chamberlin) (from Mexico) and P. mexicanus Muchmore (from Mexico) is assessed, with Paraliochthonius mexicanus being removed from synonymy with P. johnstoni and regarded as a distinct species. New terms are proposed for two morphologies of the chelal teeth: diastemodentate for teeth in which a gap is present between adjacent teeth, and juxtadentate for teeth that are abutting each other. Keywords: new species, morphology, taxonomy, Australia, New Caledonia INTRODUCTION and Alteri 1969) and Pselaphochernes Beier, 1932 (Beier 1956) (Chernetidae). The biological traits of Representatives of several pseudoscorpion genera littoral pseudoscorpions have been rarely studied, occur exclusively in halophilic habitats.