Gamasus pectinifer G. Canestrini, 1881: 513. Type locality: Italy.
Gamasus pectinifer.—G. Canestrini & R. Canestrini, 1881: 1082.
Hypoaspis pectinifer.—G. Canestrini, 1885: 83.
Pachylaelaps pectinifer.— Berlese, 1892a: 6; Schweizer, 1961: 101; Hirschmann & Krauss, 1965: 5; Costa, 1971: 261; Koroleva, 1977b: 421, 468; Castagnoli & Pegazzano, 1985: 310; Karg, 1993: 120; Mašán, 2007a: 216.
Pachylaelaps (Pachylaelaps) pectinifer.— Berlese, 1892c: 71; Karg, 1971: 145; Mašán, 2007a: 99.
Gamasus longipalpoides Felt, 1896: 259, in Lintner (1896). Type locality: USA — Massachusetts. New synonymy.
Pachylaelaps longipalpoides.— Hennessey & Farrier, 1988: 23; Farrier & Hennessey, 1993: 103.
Pachylaelaps lindrothi Sellnick, 1940: 87. Type locality: Iceland. Synonymy by Karg (1971: 145).
Pachylaelaps lindroffi (sic).— Turk, 1953: 12.
Pachylaelaps lindrothi.— Evans & Hyatt, 1956: 124; Hirschmann & Krauss, 1965: 5; Karg, 1965: 270; Costa, 1971: 261.
Pachylaelaps sellnicki Hirschmann & Krauss, 1965: 5. Type locality: Great Britain. New name for Pachylaelaps lindrothi Sellnick, 1940 sensu Evans & Hyatt (1956). Synonymised with Gamasus longipalpoides by Hennessey & Farrier (1988: 23) and Pachylaelaps pectinifer by Mašán (2007a: 99).
Pachylaelaps (Pachylaelaps) sellnicki.— Karg, 1971: 145.
Pachylaelaps sellnicki.— Karg, 1993: 122.