monotypic

adjective

1. having only one type.
2. of the nature of a monotype.
3. Biology. having only one representative, as a genus with a single species.

adjective

1. (of a genus or species) consisting of only one type of animal or plant
2. of or relating to a monotype

1. Having a single form or member, especially containing no more than one taxonomic category of the next lower rank. A monotypic genus contains a single species, while a monotypic species consists of a single population that is not divided into subspecies. Compare polytypic.