A definition for differing terminal taxa in nomenclature is needed to make them practically relevant. The International Commission of Zoological Nomenclature (1999) provides for two levels: species and subspecies. At present species and subspecies are used interchangeably and arbitrarily. We examine both concepts, with a focus on practical applications of these terms.

Currently, species represent the last meaningful unit in nomenclature. Recent advances in species theory have sought to avoid the complexities of forcing a taxonomist to choose a species concept (Heethoff 2018). Zealous adherence to a rigid conceptual demarcation has plagued the differentiation of species group-level taxa (Maxwell et al. 2020). The latest conceptual iteration views species as essentialistic objects in an evolutionary continuum, which provides for the ideal framework for a species definition (Maxwell et al. 2020). Fundamentally, the practical rationale for erecting species is to generate points of reference enabling...