Desertas Islets, Madeira.
Recent molecular studies indicated that this species is sister to all other members of genus#R#R; it has therefore been proposed that it be separated in monotypic genus Thalobata#R#R. Several molecular and morphological studies, as well as investigation of vocalizations#R#R, have revealed that the species hitherto known as H. (= Oceanodroma) castro actually consists of several distinct taxa, one of which has already been separated as H. monteiroi (which see) and that breeding in Cape Verde Is, H. jabejabe is now all provisionally recognized at species level, while cool-season breeders in Azores, Madeira, Salvages and the Berlengas Is (off C Portugal) differ from hot-season breeders (in Madeira and Salvages) in vocalizations#R and morphology#R and have been proposed as granti, but genetic differences less obvious than those found among Azores populations#R#R, and all are therefore retained meantime in castro, pending further investigation. Further, studies of vocalizations and phylogeography suggest that a number of additional forms exist elsewhere in the currently defined range of H. castro and that these, too, may merit treatment as full species#R#R#R. Treated as monotypic.
Tropical and subtropical Atlantic, breeding in E Atlantic from Berlengas Is (off C Portugal) and Azores S to Ascension I and St Helena; also in tropical and subtropical Pacific, breeding in E Japan, Kauai (Hawaii) and Galapagos Is.
Food and feeding
Status and conservation
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