An online taxonomic facility of Geometridae (Lepidoptera), with an overview of global species richness and systematics

We present a new, online, open access portal to the geometrid moths of the world (Lepidoptera: Geometridae). The portal provides access to the global database including data on classification, valid genera and species, synonyms and type localities, and to an online list of valid names. The value of this online facility, inter alia, is demonstrated by using the underlying data to update our understanding of the global and regional species richness of the family. We also review, clarify and list the family-group names (family, subfamily, tribe) of the Geometridae to provide users with a better understanding of the higher category framework when they access the database. Currently, the Geometridae database includes 34,897 available species-group names. Of these, 7,891 are considered synonyms (23% of available names), giving a total of 27,006 valid species-group names, which in turn comprise 23,872 species names and 3,134 subspecies names. The world fauna is classified into 2,019 genera, 92 tribes and 9 subfamilies. Our paper also includes an annotated list of all 202 subfamily, tribe and subtribe names in systematic order. One hundred family-group names (49.5%) are considered synonyms. Although most geometrid species were described in the 19th and 20th centuries, the average number of new species descriptions from 2000–2022 has been fairly constant at around 80 per year, implying there is still much more hidden geometrid diversity yet to be discovered.