A new fossil subspecies of booby (Aves, Sulidae: Papasula) from Mauritius and Rodrigues, Mascarene Islands, with notes on P. abbotti from Assumption Island Author Hume, Julian P. 0000-0001-5890-9696 Bird Group, Department of Life Sciences, Natural History Museum, Akeman St, Tring, Herts HP 23 6 AP. United Kingdom. Corresponding author. j. hume @ nhm. ac. uk; https: // orcid. org / 0000 - 0001 - 5890 - 9696 j.hume@nhm.ac.uk text Zootaxa 2023 2023-04-21 5270 3 507 536 http://dx.doi.org/10.11646/zootaxa.5270.3.5 journal article 10.11646/zootaxa.5270.3.5 1175-5326 574616B3-9117-45E2-B850-7461E412999E †Hiva Oa Booby Papasula abbotti costelloi Steadman et al. , 1988 Papasula abbotti costelloi Steadman, Schubel & Pahlavan, 1988 , p.490 . Holotype : Left tibiotarsus BPBM 167105 u/s Measurements: See Steadman et al. 1988 . Type Locality: Hanamiai Site, Tahuata, Marquesas Islands, South Pacific. Distribution: Tahuata and Hiva Oa, Marquesas Islands, South Pacific.