The primary method for assessing nominal species diversity is through the use of species richness metrics, which count the number of different species present in a specific area without considering their abundance or ecological roles. This straightforward approach provides an initial snapshot of biodiversity, allowing researchers to identify hotspots and regions of conservation concern. Complementary methods, like Shannon-Wiener or Simpson's diversity indices, can also be applied to provide deeper insights into species diversity and community structure. Understanding species diversity is crucial for informed conservation efforts.