Pediculus vagelli J.C. Fabricius, 1787: 369.
Ancistrona procellariae Westwood, 1874: 197, pl. 37, fig. 4.
Ancistrona gigas Piaget, 1883: 152, pl. 9, fig. 1.
Ancistrona gigas Piaget, 1885 [sic]; Kellogg & Kuwana 1902: 483.
Ancistrona vagelli (J.C. Fabricius, 1787); Thompson 1939: 15.
Ancistrona vagelli (J.C. Fabricius, 1787); Hopkins & Clay 1952: 36.
Neotype ♂ in NHML (Clay & Hopkins (1960: 6).
Type host: Fulmarus glacialis glacialis (Linnaeus, 1758).
Galápagos host: Pterodroma phaeopygia (Salvin, 1876).
Galápagos locality: Isla Santa Cruz.
Galápagos references: Kellogg & Kuwana (1902); Kellogg (1908: 75); Thompson (1939).
Other significant references: Kéler (1952: 209–213, figs 4–5); Clay & Hopkins (1960: 4, figs 1–6); Timmermann (1965: 177–179, figs 114–115, 122); Palma (1996: 113); Palma (1999: 375–378); Price et al. (2003: 89).
Material examined: 2 females (2 samples, MONZ).
Remarks: Pterodroma phaeopygia is endemic to the Galápagos Islands. Although Dickinson (2003: 74) listed it as the subspecies Pterodroma phaeopygia phaeopygia, we regard it as a full species as well as Pterodroma sandwichensis (Ridgway, 1884), following Browne et al. (1997: 814). Kellogg & Kuwana (1902: 483) recorded “Two immature specimens from an undetermined host” as “ Ancistrona gigas ”, but these specimens could not be found in the Kellogg Collection. Ancistrona vagelli has been recorded from a large number of procellariid hosts (Price et al. 2003: 89), including Pterodroma phaeopygia.
Genus Austromenopon Bedford, 1939
Austromenopon Bedford, 1939. Onderstepoort Jour. Vet. Sci. Animal Ind. 12 (1): 122. Type species: Menopon crocatum Nitzsch [in Giebel], 1866 = Austromenopon crocatum (Nitzsch [in Giebel], 1866) (by original designation).
Procellariphaga Eichler, 1949. Boll. Soc. Ent. Italiana 79: 12. Type species: Procellariphaga ossifragae Eichler, 1949 = Austromenopon ossifragae (Eichler, 1949) (by original designation).