In accord with AOS-NACC (Chesser et al. 2021), the nomenclature of Phalacrocorax (cormorants and shags), and the sequence of genera and species, are revised, following Kennedy and Spencer (2014) and Kennedy et al. (2019). Phalacrocorax is partitioned into six genera, which are listed in the sequence Poikilocarbo, Urile, Phalacrocorax, Gulosus, Nannopterum, and Leucocarbo. Change the scientific name of Stewart Island Shag from Phalacrocorax chalconotus to Leucocarbo chalconotus.