Species richness is the number of different species represented in an ecological community, landscape or region. Species richness is simply a count of species, and it does not take into account the abundances of the species or their relative abundance distributions.

Species richness is a measure of biodiversity that refers to the number of different species present in a particular area or ecosystem. Species richness is quantified by simply counting the total number of species living in a particular place.

species richness, the count, or total number, of unique species within a given biological community, ecosystem, biome, or other defined area.

species richness Quick Reference The number of species present in a community, measured as the number of species per unit of ground area. This contrasts with diversity, which takes account of the way individuals are apportioned among the different species.