Article 36. Principle of Coordination.
36.1. Statement of the Principle of Coordination applied to family-group names. A name established for a taxon at any rank in the family group is deemed to have been simultaneously established for nominal taxa at all other ranks in the family group; all these taxa have the same type genus, and their names are formed from the stem of the name of the type genus [Art. 29.3] with appropriate change of suffix [Art. 34.1]. The name has the same authorship and date at every rank.
Example. The family name HESPERIIDAE (Lepidoptera), based on Hesperia Fabricius, 1793, was established in 1809 by Latreille (as Hesperides). Latreille is deemed also to have simultaneously established the coordinate superfamily name HESPERIOIDEA and the coordinate subfamily name HESPERIINAE (even though the former was first used by Comstock & Comstock (1904) and the latter by Watson (1893)). The authorship and date of all three names is Latreille, 1809.
36.2. Type genus. When a nominal taxon is raised or lowered in rank in the family group its type genus remains the same [Art. 61.2.2].