Coleoptera: Elmidae and Protelmidae contains a complete list of subfamilies, tribes, subtribes, genera, subgenera, species and subspecies, and their synonyms described before 2015. Protelmidae are here elevated from tribal rank to family rank. Other new nomenclatorial and taxonomic acts include a new substitute name, seven new generic and specific synonymies, four new combinations, two designations of type species and eight mandatory corrections of incorrect original spellings. Detailed information about the geographical distribution of each species is provided. This catalogue includes...