New crabs from hydrothermal vents of the Kermadec Ridge submarine volcanoes, New Zealand: Gandalfus gen. nov. (Bythograeidae) and Xenograpsus (Varunidae) (Decapoda: Brachyura) Author Mclay, Colin text Zootaxa 2007 1524 1 22 journal article 10.5281/zenodo.177502 fdce9d61-757d-47cf-a786-6a9279875bdd 1175-5326 177502 Bythograeidae Williams, 1980 Bythograeidae Williams, 1980 : 444 . Type genus. Bythograea Williams, 1980 .