There are approximately 16 species in this genus.: X. alievi · X. antelopensis · X. antiquus · X. asymbatos · X. channelli · X. clava · X. gifuensis · X. horridus · X. mclauglini · X. normalis · X. plenus · X. pulcher · X. sandovali · X. singularis · X. spicularius · X. spineus
There are approximately 1 species in this genus.: X. karpenissionensis
Accessed through GBIF Data Portal November 24, 2007:
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