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 Key to species of Xenograpsus 1. Epigastric tubercles not arranged in cristae; many large protogastric tubercles ............ X. ngatama sp. nov. - Epigastric cristae well developed; single prominent protogastric tubercle ................................................. 2 2. Single anterolateral tooth; cervical groove well marked X. novaeinsularis Takeda & Kurata, 1977 ( Japan ) - No anterolateral teeth; cervical groove not well marked............................................................................... .......................................................................................... X. testudinatus Ng, Huang & Ho, 2000 ( Taiwan )