monotypic
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mon o typ ic |ˌmänəˈtipik ˌmɑnəˈtɪpɪk | ▶adjective chiefly Biology having only one type or representative, esp. (of a genus ) containing only one species.
monotypic |ˌmɒnə (ʊ )ˈtɪpɪk | ▶adjective chiefly Biology having only one type or representative, especially (of a genus ) containing only one species.