2021 splits and lumps

This list is used to show the various splits, lumps, and discoveries, as well as new families, subfamilies, and genera that may crop up.

2021 new families and subfamilies

 * Sternidae: based on Černý and Natale (2021), Sternidae has been promoted into a family, and contains the following subfamilies:
 * Rhynchopinae: based on Černý and Natale (2021), skimmers are now classed as a subfamily of Sternidae.
 * Gyginae: based on Černý and Natale (2021), white terns are now classed as a subfamily of Sternidae.
 * Sterninae: based on Černý and Natale (2021), true terns are now classed as a subfamily of Sternidae.