The systematics of the ‘sapphire azure’ butterfly (Ogyris aenone) species complex is revised through an integrative taxonomic approach. Phylogenetic analysis resolved five species within this group, with one species, Ogyris caelestia Beaver & Braby, sp. nov., here described as new and another, Ogyris doddi, stat. rev., raised to full species. The complete life histories, biology and ecology of all members of this species-group are illustrated and diagnosed, and confusing aspects of the literature are clarified. Several species are of conservation significance, including the new species.

The Antarctic feather star Promachocrinus kerguelensis arguably comprises several species but taxonomic revision has not been attempted. Here we use DNA data and morphological characters to differentiate the species and formally described those that are new. The species complex was resolved into eight species, four of which are newly described, though not all can be reliably distinguished based on morphology. One of the new species has a restricted distribution, but the remainder appear to be circum-Antarctic.