Pachylaelaps sp., copyright Matthew Shepherd.

Belongs within: Eviphidoidea.

The Pachylaelapidae are a group of predatory mites found in soil habitats such as litter or animal nests; dispersal is often by means of phoresy in association with beetles. More distinctive members of the family include the genus Pseudolaelaps, females of which have a free metasternal shield, two ventral setae on genu and tibia I, and a smooth, trispinate epistome (Lindquist et al. 2009). The myrmecophilous Sphaerolaelaps holothyroides lacks the spine-like setae most species have on tarsus II, and has nine pairs of setae in the opisthonotal region of the holodorsal shield (Evans & Till 1979).

Characters (from Lindquist et al. 2009): Tarsus II in female and male usually with one or two of the distal setae enlarged into stout spines (if lacking such spines, female with a genitiventral shield closely bordered by an anal shield or with peritrematic-exopodal shields extending posteriorly beyond coxae IV to fuse with metapodal plates); tibia III and genu and tibia IV each with one anterolateral seta.

<==Pachylaelapidae [Neoparasitidae, Pachylaelaptini]
    |--Pachyseius Berlese 1910FH93
    |    |--*P. humeralis Berlese 1910ET79
    |    `--P. adeliensisP94
    |--Sphaerolaelaps Berlese 1903ET79
    |    `--*S. holothyroides (Leonardi 1896) [=Laelaps holothyroides]ET79
    |--Meliponapachys Turk 1948FH93
    |    `--M. pallidus Turk 1948FH93
    |--Neoparasitus Oudemans 1901FH93 [incl. Brachylaelaps Berlese 1910V25]
    |    |--N. oudemansi Oudemans 1901 [incl. Pachyseius molussus Berlese 1923, P. quartus Vitzthum 1924]V25
    |    `--*Brachylaelaps’ rotundus Berlese 1910V25
    |--Megalolaelaps Berlese 1892FH93
    |    |--M. enceladus (Berlese 1910) [=Hypoaspis enceladus; incl. Pachylaelaps ornata Keegan 1946]FH93
    |    `--M. spinirostris Berlese 1910V25
    |    |--O. skalriLKW09
    |    `--O. vysotskajaLKW09
    |--Zygoseius Berlese 1916H98
    |    |--Z. furciger Berlese 1916FH93 [=Lasioseius (Zygoseius) furcigerV25]
    |    `--Z. sarcinulus Halliday 1997H98
    |--Pseudolaelaps Berlese 1916LKW09, ET79 [Pseudolaelapinae]
    |    |--*P. doderoi (Berlese 1910) [=Laelaps (Hoplolaelaps) doderoi]ET79
    |    |--P. gamaselloidesLKW09
    |    `--P. paulseniLKW09
    |--Onchodellus Berlese 1904FH93
    |    |--*O. reticulatus (Berlese 1904) [=Pachylaelaps (*Onchodellus) reticulatus]ET79
    |    |--O. antillanus Turk 1948FH93
    |    |--O. eurasius (Vitzthum 1925) [=Pachylaelaps (Onchodellus) eurasius]V25
    |    `--O. hispani (Berlese 1908) [=Pachylaelaps (Onchodellus) hispani]V25
    `--Pachylaelaps Berlese 1888H98
         |--*P. pectinifer (Canestrini & Canestrini 1881) [=Gamasus pectinifer]ET79
         |--P. aegypticusLKW09
         |--P. australicus Womersley 1942H98
         |--P. cluozzai Schweizer 1961S61
         |--P. furcifer Oudemans 1903FH93
         |--P. haeros Berlese 1888V25 [incl. P. haeros var. mexicanus Stoll 1893FH93]
         |--P. hamifer Trägårdh 1931T31
         |--P. humusorum Schweizer 1961S61
         |--P. jurassicus Schweizer 1961S61
         |--P. laeuchli Schweizer 1922S61
         |--P. latus Schweizer 1961S61
         |--P. littoralis Halbert 1915H66
         |--P. longipalpoides (Felt in Lintner 1896) [=Gamasus longipalpoides; incl. P. sellnicki Hirschmann & Kraus 1965]FH93
         |--P. longisetisET79
         |--P. magnusS61 [=P. pectinifer var. magnusS22]
         |--P. penicilliger Berlese 1920H98
         |--P. purcheri Schweizer 1961S61
         |--P. regularis Berlese 1920S61
         |--P. sculptus Berlese 1920S61
         |--P. siculus [=P. strigifer var. siculus]S61
         |--P. singularis Schweizer 1961S61
         |--P. stabelchodai Schweizer 1961S61
         |--P. strigiferS61
         |--P. tablasoti Schweizer 1961S61
         |--P. tesselatus Berlese 1920S61
         `--P. trupchumi Schweizer 1961S61

*Type species of generic name indicated


[ET79] Evans, G. O., & W. M. Till. 1979. Mesostigmatic mites of Britain and Ireland (Chelicerata: Acari-Parasitiformes). An introduction to their external morphology and classification. Transactions of the Zoological Society of London 35: 139–270.

[FH93] Farrier, M. H., & M. K. Hennessey. 1993. Soil-inhabiting and free-living Mesostigmata (Acari-Parasitiformes) from North America: an annotated checklist with bibliography and index. North Carolina Agricultural Research Service, North Carolina State University, Technical Bulletin 302: i–xvi, 1–408.

[H98] Halliday, R. B. 1998. Mites of Australia: A checklist and bibliography. CSIRO Publishing: Collingwood.

[H66] Hirschmann, W. 1966. Gangsystematik der Parasitiformes. Teil 15. Gänge von Litoralmilben und neue Litoralmilbenarten. Acarologie: Schriftenreihe für Vergleichende Milbenkunde 9: 25–44.

[LKW09] Lindquist, E. E., G. W. Krantz & D. E. Walter. 2009. Order Mesostigmata. In: Krantz, G. W., & D. E. Walter (eds) A Manual of Acarology 3rd ed. pp. 124–232. Texas Tech University Press.

[P94] Pugh, P. J. A. 1994. Non-indigenous Acari of Antarctica and the sub-Antarctic islands. Zoological Journal of the Linnean Society 110: 207–217.

[S22] Schweizer, J. 1922. Beitrag zur Kenntnis der terrestrischen Milbenfauna der Schweiz. Verhandl. Naturf. Ges. Basel 33: 23–112, 4 pls.

[S61] Schweizer, J. 1961. Die Landmilben der Schweiz (Mittelland, Jura und Alpen): Parasitiformes Reuter, mit 246 Arten und Varietäten und 268 meist kombinierten Originalzeichnungen. Denkschriften der Schweizerischen Naturforschenden Gesellschaft [Mémoires de la Société Helvétique des Sciences Naturelles] 84: i–vii, 1–207.

[T31] Trägårdh, I. 1931. Acarina from the Juan Fernandez Islands. Natural History of Juan Fernandez and Easter Islands 3 (4): 553–628.

[V25] Vitzthum, H. 1925. Fauna sumatrensis. (Beitrag no. 5). Acarinae. Supplementa Entomologica 11: 1–79.

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