Addoida

Addoida is a term that has appeared in some historical or obscure taxonomic literature but is not recognized as a valid, current taxonomic group in standard nomenclature. The exact circumscription of Addoida, if it ever existed as a formal taxon, is unclear, and different sources have proposed divergent contents. In modern taxonomic databases and reputable checklists, Addoida is not listed as a valid rank or clade. The similarity of the name to several other taxonomic patterns—such as Addoidea, Aedoidea, and Adoidea—has contributed to confusion, and some usages may reflect misidentifications, misspellings, or provisional labels rather than a stable classification. Because there is no widely accepted definition, it is not possible to describe a consistent set of diagnostic traits, geographic distribution, or evolutionary relationships for Addoida.

In practice, when encountered in scientific or educational writing, Addoida should be treated as an ambiguous or nonstandard term. If a source uses the name, it is advisable to consult the original publication to determine what group, if any, the author intended to include and to verify whether the name has since been rejected or replaced. See also Addoidea, Aedoidea, Adoidea, and related higher taxa for context.

This article does not provide a current definition because reputable sources do not recognize Addoida as a valid taxon.