The purpose of this application, under Article 23.9.3 of the Code, is to conserve the generic name Lychnorhiza Haeckel, 1880 for a genus of scyphozoan jellyfish (Cnidaria, Scyphozoa) from Central and South America and the Malayan Archipelago. The name is threatened by a senior synonym, Rhacopilus Agassiz, 1862, unused since its original description. It is also proposed to conserve the specific name Lychnorhiza lucerna Haeckel, 1880 (type species of the genus Lychnorhiza). The nomenclatural stability of this name is threatened by a senior subjective synonym, Rhizostoma cruciata Lesson, 1830.

The purpose of this application, under Article 23.9.5 of the Code, is to conserve the specific name of the heteropod Atlanta inflata Gray, 1850 (atlantidae), originally published as a primary homonym of the pteropod Atlanta inflata d'Orbigny, 1836 (usually cited as Limacina inflata, currently Heliconoides inflata) (limacinidae). Both names are in use and have not been considered congeneric since the 19th century. We propose to conserve the name Atlanta inflata Gray, 1850 by ruling that the name is not invalid by reason of being a junior primary homonym.

The purpose of this application, under Article 23.9.5 of the Code, is to conserve the name Papilio danae Fabricius, 1775 (Lepidoptera, pieridae) which, as Colotis danae, is well-established as the valid name for a common and widespread butterfly with many subspecies in circa 50 countries in Africa, Arabia, and Asia. The name is threatened by the primary homonym Papilio danae Hufnagel, 1766. It is proposed that Hufnagel's name be suppressed for the purposes of the Principle of Homonymy under the plenary power of the Commission, in the interest of nomenclatural stability.

The purpose of this application, under Articles 23.9.3 and 81.2.3 of the Code, is to conserve the species-group names Heliconius tristero Brower, 1996 and Heliconius melpomene mocoa Brower, 1996 (Lepidoptera: Nymphalidae) for mimetic butterflies from the Putumayo region of southeastern Colombia by suppressing the senior name Heliconius melpomene bellula Brown, 1979. The authorship of this name is convoluted, bellula having been originally proposed as an unavailable quadrinomen and made available by Brown (1979). More significantly, because the implied holotype of Heliconius melpomene bellula Brown, 1979 does not belong taxonomically to the species whose oldest available name is Heliconius melpomene (Linnaeus, 1764), H. melpomene bellula Brown, 1979 is not a subjective synonym of H. melpomene (Linnaeus, 1764). Strict application of the Code would synonymise H. tristero Brower, 1996 with H. bellula Brown, 1979 and retain H. melpomene mocoa Brower, 1996 as a valid name. That action would reverse the current application of nomenclature for these taxa as published in numerous recent papers and result in significant confusion. Furthermore, given current disagreement among authors as to the taxonomic status of the specimen associated with the description of the name bellula, future nomenclatural instability is likely if the name is maintained. It is therefore proposed that the name Heliconius tristero be conserved and the name Heliconius bellula be suppressed.

The purpose of this application, under Articles 75.5 and 75.6 of the Code, is to replace the existing, non-diagnostic holotype of Megalosaurus crenatissimus Depéret, 1896 (currently Majungasaurus crenatissimus) by a neotype. The designation of a neotype is necessary to conserve the prevailing usage and concept of the species.

The purpose of this application, under Articles 68 and 75 of the Code, is to conserve the generic name Cuvieronius Osborn, 1923, long and widely applied to extinct South American gomphotheriid proboscideans, by setting aside all previous type species fixations and designating Mastotherium hyodon Fischer, 1814 as the type species of Cuvieronius and by designating a neotype for that species. Because M. hyodon has long and universal (though incorrect) usage as the type species of Cuvieronius and because the type specimen of M. hyodon is unidentifiable, the type species and neotype designations are proposed to promote the stability and universality of nomenclature.

The Commission has ruled that priority is maintained for the species name Hybosorus roei Westwood, 1845. A proposal to conserve the junior synonym Hybosorus illigeri Reiche, 1853 by giving it precedence over Hybosorus roei Westwood was not approved.

The Commission has suppressed the names Pedionomus and Pedionomus ocellatus Gould, [31 October] 1840, thereby conserving the generic names Pedionomus Gould, [1 December] 1840 for the Australian plains-wanderer (pedionomidae) and Leipoa Gould, [1 December] 1840 and the specific name Leipoa ocellata Gould, [1 December] 1840 for the Australian malleefowl (megapodiidae). The names Pedionomus Gould, [1 December] 1840, Leipoa Gould, [1 December] 1840 and Leipoa ocellata Gould, [1 December] 1840 have been in prevailing usage as the valid names for these taxa for over 150 years.

The Commission has ruled that the usage of the specific name of Paleoparadoxia tabatai (Tokunaga, 1939), a species of Middle Miocene desmostylian from Japan and California, will not be conserved by designation of a neotype.