Brachychthonius sp., copyright Zoë Lindo.

Belongs within: Brachychthoniidae.

Brachychthonius is a cosmopolitan genus of brachychthoniid mites with two pairs of suprapleural plates and simple, undifferentiated adanal setae. The majority of known species are described from the Holarctic region but a small number of species are known from Africa whereas B. pacificus was described from Samoa (Subías 2004).

Characters (from Balogh & Balogh 1992): Notogaster with two transverse sutures and three shields, no setae arising within sutures; shield Na bearing two rows of setae (c and d); fields of shield Na appearing in pairs, two groups also in median line, separated by transverse stripe; seta d2 in marginal position, aligned with longitudinal row of setae cpe2. Two discernible pairs of suprapleural plates (SpC, SpE). Epimere IV with four pairs of setae. All three pairs of adanal setae thin, simple, setiform. Peranal plate present.

<==Brachychthonius Berlese 1910S04 [=Brachiphthonius (l. c.)CH98; incl. Brachychochthonius Jacot 1938S04]
    |--B. berlesei Willmann 1928 [incl. Hypochthonius brevis Berlese 1910 non Michael 1888, *B. brevis]S04
    |--B. africanus Balogh 1958S04
    |--B. amicabilis Gil-Martín & Subías 1997S04
    |--B. bimaculatus Willmann 1936 [incl. B. helveticus Schweizer 1956]S04
    |--B. foliatus (Hammer 1958)BC63
    |--B. griseus (Hammer 1958)BC63
    |--B. hauserorum (Mahunka 1979) [=Brachychochthonius hauserorum]S04
    |--B. hirtus Moritz 1976S04
    |--‘Brachychochthonius’ hungaricus (Balogh 1943)M79
    |--B. immaculatus Forssl. 1942H73
    |--B. impressus Moritz 1976 [incl. Brachychochthonius subcricoides Balogh & Mahunka 1979]S04
    |--B. jugatus (Jacot 1938) (n. d.)S04 (see below for synonymy)
    |--B. laevis (Jacot 1938) (n. d.) [=Brachychochthonius laevis]S04
    |--B. lineatus (Mahunka 1982) [=Brachychochthonius lineatus]S04
    |--B. maculatus Forsslund 1962BM66
    |--B. pacificus Hammer 1973S04
    |--B. parahirtus Subías & Gil-Martín 1991S04
    |--B. pauliani Balogh & Mahunka 1966S04
    |--B. pius Moritz 1976S04
    |--B. psammophylus Mahunka 1987S04
    |--B. pseudoimmaculatus Subías & Gil-Martín 1991S04
    |--B. rotundatus (Hammer 1958)BC63
    |--B. semiornatus Evans 1952BM66
    `--B. sexnotatusG46

Brachychthonius jugatus (Jacot 1938) (n. d.)S04 [=*Brachychochthonius jugatusCH98; incl. Brachychthonius jugatus var. suecica Forsslund 1942SL71]

*Type species of generic name indicated


[BC63] Balogh, J., & J. Csiszár. 1963. The zoological results of Gy. Topál’s collectings in south Argentina. 5. Oribatei (Acarina). Annales Historico-Naturales Musei Nationalis Hungarici 55: 463–485.

[BM66] Balogh, J., & S. Mahunka. 1966. The scientific results of the Hungarian soil zoological expedition to the Brazzaville-Congo. 3. The oribatid mites (Acari) of Brazzaville-Congo. I. Acta Zoologica Academiae Scientiarum Hungaricae 12 (1–2): 25–40.

[CH98] Colloff, M. J., & R. B. Halliday. 1998. Oribatid Mites: A catalogue of Australian genera and species. CSIRO Publishing: Collingwood.

[G46] Grandjean, F. 1946. Les poils et les organes sensitifs portés par les pattes et le palpe chez les oribates. Troisième partie. Bulletin de la Société Zoologique de France 71: 10–29.

[H73] Hammer, M. 1973. Oribatids from Tongatapu and Eua, the Tonga Islands, and from Upolu, Western Samoa. Det Kongelige Danske Videnskabernes Selskab Biologiske Skrifter 20 (3): 1–70, 29 pls.

[M79] Mahunka, S. 1979. Neue und interessante Milben aus dem Genfer Museum XLI. Vierter Beitrag zur Kenntnis der Oribatiden-Fauna Griechenlands (Acari: Oribatida). Revue Suisse de Zoologie 86 (2): 541–571.

[SL71] Spain, A. V., & M. Luxton. 1971. Catalog and bibliography of the Acari of the New Zealand subregion. Pacific Insects Monograph 25: 179–226.

[S04] Subías, L. S. 2004. Listado sistemático, sinonímico y biogeográfico de los ácaros oribátidos (Acariformes, Oribatida) del mundo (1758–2002). Graellsia 60 (número extraordinario): 3–305.

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