The purpose of this application, under Articles 55.3 and 81.2.1 of the Code, is to resolve the homonymy of the family-group name Mecynostomatidae Kukalová, 1969 (Insecta, Paleodictyoptera) by suppression of its senior homonym Mecynostomatidae Lameere, 1917 (Insecta, Paleodictyoptera) for the purposes of both the Principle of Priority and the Principle of Homonymy.

The purpose of this application, under Article 55.3.1 of the Code, is to remove the homonymy of Margaritidae Blainville, 1824 (type genus Margarita Leach, 1814) (Mollusca: Bivalvia) with Margaritidae Thiele, 1924 (type genus Margarites Gray, 1847) (Mollusca: Gastropoda) by emending the latter to Margaritesidae. These two homonymous family-group names are based on similar but not identical type-genus names and both are in current use.

The purpose of this application, under Article 23.9.3 of the Code, is to suppress the little-used senior family-group name Epigraphiidae Guenée, 1845, in order to conserve the well-known family group name Depressariidae Meyrick, 1883 (both in Lepidoptera). Both the name Epigraphiidae and its derivatives have been seldom used, with about eleven known uses since 1900, in contrast to its junior synonym Depressariidae.

The purpose of this application, under Article 23.9.3 of the Code, is to conserve at superfamily level the usage of the family-group name Gelechioidea Stainton, 1854. The name is threatened by three senior family-group names described by Bruand, 1850 [1851], currently considered as valid families in the same superfamily as Gelechiidae: Oecophoridae, Elachistidae and Coleophoridae, which are thus subjective senior synonyms at the superfamily level. Strict application of the Principle of Priority would result in confusion as the superfamily name Gelechioidea has been almost universally used for this very diverse and economically important group of Lepidoptera.

The International Commission on Zoological Nomenclature has re-established the precedence of Megaperidae Manter, 1934 over Apocreadiinae Skrjabin, 1942 for certain digenean trematodes of fish by suspending the application of Article 35.5 of the Code.

The International Commission on Zoological Nomenclature has conserved current usage of the specific name of Clausilia quadriplicata Schmidt, 1868 (currently Quadriplicata quadriplicata) by suppressing its senior homonym Clausilia ventricosa var. quadriplicata Fitzinger, 1833.

The International Commission on Zoological Nomenclature has conserved current usage of the specific name of Typhlodromus californicus McGregor, 1954 by designating a neotype.