Cosmochthonius sp., copyright D. E. Walter.

Belongs within: Cosmochthonioidea.

The Cosmochthoniidae are a group of oribatid mites found in dry habitats such as arid soils. They are characterised by having four pairs of large erectile setae arising from transverse scissures on the notogaster. Members of the genus Phyllozetes have the notogaster divided into five shields by four sutures whereas Krivolutskiella pubescens and Cosmochthonius have it divided into four shields by three sutures. Setae e and f are widely leaf-shaped in Phyllozetes (Balogh & Balogh 1992).

Characters (from Norton & Behan-Pelletier 2009): Prodorsum and notogaster usually with reticulate or foveate sculpturing; rostrum distinctly fenestrate. Base of bothridial seta with conspicuous sharp proximal d bend. Setae of rows cf occupying anterior half of notogaster; notogaster with threee transeverse scissures, such that rows c and d on separate plates, setal rows c and d not enlarged; rows e and f much longer than others, inserted on intercalary sclerites in two type S scissures. Opisthonotal gland absent. Genital plate not divided; aggenital plates small, not fused to coxisternum; adanal plates fused posteriorly to form a U shape. Legs with five free segments past coxisternum (femora undivided); pretarsi of legs bi- or tridactylous.

<==Cosmochthoniidae [Cosmochthoniides]
    |--Krivolutskiella Gordeeva 1980S04
    |    `--*K. pubescens Gordeeva 1980S04
    |--Phyllozetes Gordeeva 1978S04
    |    |--*P. emmae (Berlese 1910)S04 (see below for synonymy)
    |    |--P. alatus Mahunka 1982S04
    |    |--P. hypoquercus McDaniel & Bolen 1980S04
    |    |--P. latifolius Gordeeva 1980S04
    |    |--P. longifolius Balakrishnan 1986S04
    |    |--P. nilamburicus Balakrishnan 1986S04
    |    |--P. osithchnjukovi Gordeeva 1980S04
    |    `--P. tauricus Gordeeva 1978S04
    |--Carbochthonius antrimensisSC19
    `--Cosmochthonius Berlese 1910S04
         |--C. (Cosmochthonius)S04
         |    |--*C. (C.) lanatus (Michael 1885) [=Hypochthonius lanatus]S04
         |    |    |--C. l. lanatus [incl. C. arctosus Pankov 2002, C. wallworki Lee 1982]S04
         |    |    |--C. l. diversiseta Sarkar & Subías 1982S04
         |    |    `--C. l. foveolatus Beck 1962S04
         |    |--C. (C.) asiaticus Gordeeva 1980S04
         |    |--C. (C.) assamensis Talukdar & Chakrabarti 1984S04
         |    |--C. (C.) australicus Womersley 1945 [=C. plumatus australicus]S04
         |    |--C. (C.) bengalensis Chakrabarti, Bhaduri & Raychaudhuri 1972S04
         |    |--C. (C.) bhutanensis Chakrabarti & Wilson 1981S04
         |    |--C. (C.) concavus Aoki 1994S04
         |    |--C. (C.) desaussurei Mahunka 1982S04
         |    |--C. (C.) domesticus Grandjean 1947 (n. d.)S04
         |    |--C. (C.) foliatus Subías 1982S04
         |    |--C. (C.) imperfectus Aoki 2000S04
         |    |--C. (C.) macrosetosus Ayyildiz & Luxton 1990S04
         |    |--C. (C.) maroccanus Gil-Martín, Subías & Arillo 1992S04
         |    |--C. (C.) minifoveolatus Gil-Martín, Subías Candelas 1991S04
         |    |--C. (C.) monegrensis Pérez-Íñigo 1991S04
         |    |--C. (C.) nayoroensis Fujikawa 1980S04
         |    |--C. (C.) novus Sergienko 1991S04
         |    |--C. (C.) pallidus Lombardini 1961 (n. d.)S04
         |    |--C. (C.) perezinigoi Morell 1988S04
         |    |--C. (C.) plumatus Berlese 1910S04
         |    |    |--C. p. plumatusS04
         |    |    `--C. p. suramericanus Hammer 1958S04
         |    |--C. (C.) ponticus Gordeeva 1980S04
         |    |--C. (C.) reticulatus Grandjean 1947S04, NB-P09, S04
         |    |--C. (C.) semiareolatus Hammer 1966S04
         |    |--C. (C.) semifoveolatus Subías 1982S04
         |    |--C. (C.) signatus Pérez-Íñigo 1990S04
         |    |--C. (C.) spinosus Gil-Martín, Subías & Candelas 1991S04
         |    |--C. (C.) sublanatus Mahunka 1977S04
         |    |--C. (C.) taurus Niemi, Gordeeva & Ayyildiz 2002S04
         |    |--C. (C.) tenuisetus Gordeeva 1980S04
         |    |--C. (C.) trivialis Sergienko 1991S04
         |    `--C. (C.) ugamaensis Gordeeva 1980S04
         `--C. (Nanochthonius Subías & Gil-Martín 1995) [=Microchthonius Kahwash, Subías & Ruiz 1989 non Hadzi 1933]S04
              |--C. (*N.) ruizi Kahwash, Subías & Ruiz 1989S04 [=C. (*Microchthonius) ruiziS04, BB92]
              `--C. (N.) juvenalis Kamill 1986S04

*Phyllozetes emmae (Berlese 1910)S04 [=Cosmochthonius emmaeS04, Ovochthonius emmaeH98, Phylozetes (l. c.) emmaeH98; incl. Trichthonius heterotrichus Sanyal & Bhaduri 1983S04]

*Type species of generic name indicated


[BB92] Balogh, J. & P. Balogh. 1992. The Oribatid Mites Genera of the World vol. 1. Hungarian Natural History Museum: Budapest.

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

[NB-P09] Norton, R. A., & V. M. Behan-Pelletier. 2009. Suborder Oribatida. In: Krantz, G. W., & D. E. Walter (eds) A Manual of Acarology 3rd ed. pp. 430–564. Texas Tech University Press.

[SC19] Schaefer, I., & T. Caruso. 2019. Oribatid mites show that soil food web complexity and close aboveground-belowground linkages emerged in the early Paleozoic. Communications Biology 2: 387.

[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.

Leave a comment

Your email address will not be published. Required fields are marked *