Instead, a few of these issues are highlighted below, specifically in the context of taxonomic and phylogenic obstacles: ancestry, variation, and biological complexity. Among fossils, variation ...

A digital taxonomic collection, featuring 58 biological volumes and descriptions of over 50,000 species of plants and animals. A multimedia, user-friendly guide to ciliated protozoa (ciliates), an ...

During reviews for listing, the Center for Biological Diversity has withdrawn more than 100 previously petitioned species due to updated information on species’ taxonomy or status. More broadly, ...