Belongs within: Uropodoidea.
Uropoda is a genus of mites commonly found in manure or compost, or attached to insects as phoretic deutonymphs. The type species U. orbicularis is commonly found attached to coprophagous beetles of the Scarabaeoidea. The subgenus Phaulodinychus, sometimes treated as a distinct genus, contains species inhabiting wrack on the seashore that possess an ambulacra on the first leg tarsus. This ambulacra is absent in Uropoda sensu stricto. The seashore species Uropoda mitis is believed to respire via the plastron during regular periods when it is submerged by the tide (Lindquist et al. 2009). In forms sometimes treated as a distinct genus Cilliba, the marginal shield is posteriorly continuous whereas other species have it absent or fragmented towards the rear (Evans & Till 1979).
Characters (from Evans & Till 1979): Marginal shield absent posteriorly; genital shield of female produced into acute spine; levator tendon of movable digit of chelicera lacking a sclerotised node; palptibia and tarsus distinct, palpfemur with four setae; coxae I flattened, enlarged, concealing the tritosternum.
<==Uropoda Latreille 1806H98 (see below for synonymy) |--*U. (Uropoda) orbicularis (Müller 1776)ET79, FH93 (see below for synonymy) `--U. (Phaulodinychus Berlese 1904)LKW09, FH93 [incl. Halouropoda Halbert 1915FH93, Phaulodiaspis Vitzthum 1925FH93] |--‘*Phaulodinychus’ repletus Berlese 1903ET79 [incl. Halouropoda interrupta Halbert 1915E57] |--‘Trachyuropoda (Dinychura)’ alpina Schweizer 1922 [=Phaulodiaspis alpina]S61 |--U. (P.) ampla Hiramatsu & Hirschmann 1979 [=Phaulodinychus amplus]FH93 |--U. (P.) cubaensis Hiramatsu 1980FH93 |--U. (P.) difoveolatasimilis Hirschmann 1972VKC07 |--U. (P.) grandis Hiramatsu & Hirschmann 1979FH93 |--U. (P.) krantziLKW09 |--‘Phaulodinychus’ lagenaS61 |--U. (P.) lindquisti Hirschmann 1972FH93 |--U. (P.) marihirschmanni Hiramatsu 1977VKC07 |--U. (P.) maritima Hiramatsu 1977VKC07 |--U. (P.) minor (Halbert 1915)W96 [=Cilliba minorE57] |--U. (P.) mitis (Leonardi 1899)VKC07 |--U. (P.) multipora Hirschmann & Zirngiebl-Nicol 1969 [=Phaulodinychus multiporus]FH93 |--U. (P.) orchestiidarum Barrois 1887V25, A81 |--U. (P.) penicillata Hirschmann & Zirngiebl-Nicol 1969 [=Phaulodinychus penicillatus]FH93 |--U. (P.) permagna Hiramatsu & Hirschmann 1979 [=Phaulodinychus permagnus]FH93 |--U. (P.) procera Hiramatsu & Hirschmann 1979 [=Phaulodinychus procerus]FH93 |--U. (P.) procerasimilis Hiramatsu & Hirschmann 1979FH93 |--U. (P.) repleta (Berlese 1903)W96 |--U. (P.) schusteriiVKC07 |--U. (P.) similibrasiliensis Hirschmann 1992VKC07 `--U. (P.) smithi Hirschmann 1972FH93 Uropoda incertae sedis: U. amblyoponae Banks 1916 (n. d.) [=U. amblyopenae (l. c.)]H98 U. americana Riley 1877FH93 U. australiensis Hiramatsu & Hirschmann 1978H98 U. bermudaensis Ewing 1920FH93 U. bifrons Banks 1916 (n. d.)H98 U. bilobata Banks 1916 (n. d.)H98 U. bisetosa Banks 1914FH93 U. cassidea (Hermann 1804)K07 (see below for synonymy) ‘Discopoma’ circularis Banks 1898 [=Cilliba circularis]FH93 U. clavisetosa Banks 1914FH93 U. convexifrons Banks 1916 (n. d.)H98 U. corbicularis (Womersley 1961) [=Corbidinychus corbicularis]H98 U. dentifrons Banks 1916 (n. d.)H98 U. discus Stoll 1893FH93 U. duplicata Banks 1916 (n. d.)H98 U. echinata Stoll 1893FH93 U. erlagensis Hirschmann & Zirngiebl-Nicol 1969K07 U. formicae Fitch 1855FH93 U. fusca Ewing 1909FH93 U. hallidayi (Athias-Binche & Bloszyk 1988) [=Australocilliba hallidayi]H98 U. hungarica Kontschán 2004K07 U. illinoiensis Ewing 1909FH93 U. kuchtaorum (Athias-Binche & Bloszyk 1988) [=Australocilliba kuchtaorum]H98 U. levigata Hiramatsu & Hirschmann 1978H98 U. longifrons Banks 1916 (n. d.)H98 U. longisetosa Ewing 1920FH93 U. lucifuga Packard 1888FH93 U. luculentaVKC07 U. mazsalakiae Kontschán 2005K07 U. obliquifrons Banks 1916 (n. d.)H98 U. piriformis Stoll 1893FH93 U. provocans Banks in Newell 1908FH93 U. pudica Hiramatsu & Hirschmann 1978H98 U. pulcherrima (Berlese 1903)K07 [=Discopoma pulcherrimaS61, Neodiscopoma pulcherrimaS61] U. punctulata Banks 1898FH93 U. robusta Ewing 1920FH93 ‘Cilliba’ robustiunguis Ewing 1920FH93 U. sartor Hull 1918 [=Lonchothura sartor]H98 U. scelera Vitzthum 1926FH93 U. scitula Hiramatsu & Hirschmann 1978H98 U. splendida Kramer 1882K07 [=*Neodiscopoma splendidaE57; incl. N. splendidae var. porticensis Berlese 1904S61] U. submarginata Banks 1916 (n. d.)H98 U. tasmanica Banks 1916 (n. d.)H98 U. treati Hirschmann 1980FH93 U. trichordis Hiramatsu 1981H98 U. trilobata Banks 1916 (n. d.)H98 Nomina nuda: Uropoda depressa Banks in Motter 1898FH93 Uropoda essigi Banks in Essig 1958FH93
Uropoda Latreille 1806H98 [=Uroporus (l. c.)FH93; incl. Australocilliba Athias-Binche & Bloszyk 1988H98, Cilliba Heyden 1826FH93, Cillibano Gervais in Walkenaer 1844FH93, Corbidinychus Womersley 1961H98, Cyllibano Berlese 1904FH93, Discopoma Canestrini & Canestrini 1882FH93, Discopoma Berlese 1904 non Canestrini & Canestrini 1882ET79, Glyphopsis Michael 1894FH93, Neodiscopoma Vitzthum 1941FH93]
Uropoda cassidea (Hermann 1804)K07 [=Notaspis cassideusCF77, *Cilliba cassideaET79, Cyllibano cassideusS22, Discopoma cassideaV25, Oribata cassideaCF77; incl. Uropoda truncataCF77]
*Uropoda (Uropoda) orbicularis (Müller 1776)ET79, FH93 [=Acarus orbicularisFH93; incl. A. vegetans Latreille 1806 non DeGeer 1768E57]
*Type species of generic name indicated
References
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[VKC07] Vázquez, M. M., H. Klompen & C. I. Chargoy. 2007. Study of the Uropodina (Acari: Mesostigmata) in tropical forests of the Yucatan Peninsula, Mexico and Belize. In: Morales-Malacara, J. B., V. M. Behan-Pelletier, E. Ueckermann, T. M. Pérez, E. G. Estrada-Venegas & M. Badii (eds) Acarology XI: Proceedings of the International Congress pp. 43–50. Instituto de Biología and Faculdad de Ciencias, Universidad Nacional Autónoma de México, Sociedad Latinoamericana de Acarología: México.
[V25] Vitzthum, H. 1925. Fauna sumatrensis. (Beitrag no. 5). Acarinae. Supplementa Entomologica 11: 1–79.
[W96] Weigmann, G. 1996. Zonation and phenology of Uropodina (Uropodidae) in marine littoral saltmarshes. In: Mitchell, R., D. J. Horn, G. R. Needham & W. C. Welbourn (eds) Acarology IX vol. 1. Proceedings pp. 603–606. Ohio Biological Survey: Columbus (Ohio).