There are approximately 14 species in this genus.: Z. argandi · Z. boehmi · Z. calamin · Z. exquisita · Z. frequens · Z. funatoense · Z. kozuri · Z. mikamense · Z. ornatum · Z. ovum · Z. parva · Z. testatum · Z. triangulosa · Z. ventricosum
Accessed through GBIF Data Portal November 24, 2007:
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