Mideopsis sp., from here.

Belongs within: Neohydrachnidia.

The Mideopsidae are a group of heavily sclerotised water mites found in streams and hyporheic habitats. Larvae, where known, are parasitic on chironomid midges (Walter et al. 2009).

Characters (from Walter et al. 2009): Adults with dorsal and ventral shields present; typically with three pairs of genital acetabula, rarely up to seven pairs, acetabula confined to gonopore in both sexes; openings for insertion of legs IV with no or with only very small projections. Larvae with idiosoma extremely flattened dorsoventrally; gnathosoma recessed beneath protruding anterior edge of dorsal plate; dorsal plate bearing five pairs of setae, including verticils, scapulars and setae c1 laterally; coxal plates I-III on each side separated by complete suture lines, coxal plates of two sides separate; excretory pore plate triangular with anterior apex attenuate; legs with five movable segments; leg tarsi bearing paired claws.

    |--Plaumannia Lundblad 1936RFF05 [PlaumanniinaeWL09]
    |    |--P. arrenuripalpis Lundblad 1936RFF05
    |    `--P. crenophila Lundblad 1938RFF05
    |    |--Kuschelacarus ovalisWL09
    |    `--Guineaxonopsis Imamura 1983 [incl. Austramideopsoides Cook 1983]H98
    |         |--G. australica Cook 1986H98
    |         |--‘Austramideopsoides’ confusus Schwoerbel 1984S86
    |         |--‘Austramideopsoides’ cooki (Imamura 1983)S86
    |         |--‘Austramideopsoides’ ramsai Cook 1983S86
    |         `--‘Austramideopsoides’ serratipalpis Cook 1983S86
    `--Mideopsinae [Mideopsellinae]WL09
         |--Mideopsellides geaeWL09
         |--Tilia Harvey 1990WL09, H98
         |    `--T. davisae Harvey 1990H98
         |--Mideopsella Lundblad 1937WL09, RFF05
         |    `--M. forficipalpis Lundblad 1937RFF05
         |--Phreatomideopsis Schwoerbel 1986WL09, RFF05 [Phreatomideopsinae]
         |    `--P. arrenuripalpis Schwoerbel 1986RFF05
         |--Penemideopsis Cook 1986WL09, H98
         |    |--P. angovensis Harvey 1996H98
         |    |--P. phreatica Cook 1986H98
         |    `--P. pusilla Harvey 1996H98
         |--Tiramideopsis Cook 1967S86
         |    |--T. (Tiramideopsis)S86
         |    |    |--T. (T.) ovalis Cook 1967S86
         |    |    |--T. (T.) pallida Cook 1967S86
         |    |    `--T. (T.) tanasachiae Cook 1967S86
         |    `--T. (Navimideopsis Cook 1967)S86
         |         `--T. (N.) expansipes Cook 1967S86
         `--Mideopsis Neuman 1880RFF05
              |  i. s.: M. borealisWL09
              |         M. dentifera Lundblad 1943RFF05
              |         M. mexicanaWL09
              |         M. orbicularis (Müller 1776)PH91
              |         M. orbiculataP96
              |         M. plaumanni Lundblad 1937RFF05
              |         M. roztoczensisDPD16
              |         M. singularis Viets 1954RFF05
              |         M. sucabaWL09
              |         M. venusta Lundblad 1943RFF05
              |         M. violacea Lundblad 1943RFF05
              |--M. (Mideopsis)RFF05
              |    |--M. (M.) beta Cook 1980S86
              |    |--M. (M.) choconensis Cook 1980RFF05
              |    |--M. (M.) clavipes Lundblad 1936RFF05
              |    |--M. (M.) elongata (Viets 1935)RFF05
              |    |--M. (M.) forkensis Imamura 1977S86
              |    |--M. (M.) gradatipalpis Viets 1954RFF05
              |    |--M. (M.) infractipalpis Viets 1954RFF05
              |    |--M. (M.) laversi Cook 1976S86
              |    |--M. (M.) longidens Lundblad 1943RFF05
              |    |--M. (M.) microdactylus Viets 1954RFF05
              |    |--M. (M.) oviformis Lundblad 1944RFF05
              |    |--M. (M.) ovum Lundblad 1937RFF05
              |    |--M. (M.) pacrodactylus Lundblad 1938RFF05
              |    |--M. (M.) rectangularis Lundblad 1937RFF05
              |    |--M. (M.) rostrata Lundblad 1943RFF05
              |    |--M. (M.) ryugaensis Imamura 1957S86
              |    `--M. (M.) trifoliata Viets 1959RFF05
              |--M. (Mideopsides Lundblad 1943)RFF05
              |    `--M. (M.) gibberipalpis Lundblad 1943RFF05
              |--M. (Neoxystonotus Lundblad 1927)RFF05
              |    |--M. (N.) affinis Lundblad 1943RFF05
              |    |--M. (N.) biverrucata Viets 1954RFF05
              |    |--M. (N.) caviventris Lundblad 1941RFF05
              |    |--M. (N.) curvipes Viets 1954RFF05
              |    |--M. (N.) genitalis Lundblad 1936RFF05
              |    |--M. (N.) maculata Viets 1935RFF05
              |    |--M. (N.) paprzyckii Lundblad 1944RFF05
              |    |--M. (N.) sica Lundblad 1943RFF05
              |    `--M. (N.) trilobata Viets 1935RFF05
              |         |--M. t. trilobataRFF05
              |         |--M. t. lineata Lundblad 1936RFF05
              |         |--M. t. remotipora Viets 1954RFF05
              |         `--M. t. vicinipora Viets 1954RFF05
              `--M. (Xystonotus Wolcott 1900)S86
                   |--M. (X.) interstitialis Cook 1976S86
                   |--M. (X.) pallida Cook 1976S86
                   |--M. (X.) paramecia Cook 1976S86
                   |--M. (X.) pumila Cook 1974S86
                   `--M. (X.) sabulonis Cook 1976S86

*Type species of generic name indicated


[DPD16] Dabert, M., H. Proctor & J. Dabert. 2016. Higher-level molecular phylogeny of the water mites (Acariformes: Prostigmata: Parasitengonina: Hydrachnidiae). Molecular Phylogenetics and Evolution 101: 75–90.

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

[P96] Proctor, H. C. 1996. Sex-ratios and chromosomes in water mites (Hydracarina). In: Mitchell, R., D. J. Horn, G. R. Needham & W. C. Welbourn (eds) Acarology IX vol. 1. Proceedings pp. 441–445. Ohio Biological Survey: Columbus (Ohio).

[PH91] Punčochár, P., & J. Hrbáček. 1991. Water mites in the plankton of Hubenov Reservoir and their relations to fish stock composition. In: Dusbábek, F., & V. Bukva (eds) Modern Acarology: Proceedings of the VIII International Congress of Acarology, held in České Budĕjovice, Czechoslovakia, 6–11 August 1990 vol. 1 pp. 449–457. SPB Academic Publishing: The Hague.

[RFF05] Rosso de Ferradás, B., & H. R. Fernández. 2005. Elenco y biogeografía de los ácaros acuáticos (Acari, Parasitengona, Hydrachnidia) de Sudamérica. Graellsia 61 (2): 181–224.

[S86] Schwoerbel, J. 1986. Acari: “Hydrachnellae”. In: Botosaneanu, L. (ed.) Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) pp. 652–696. E. J. Brill/Dr W. Backhuys: Leiden.

[WL09] Walter, D. E., E. E. Lindquist, I. M. Smith, D. R. Cook & G. W. Krantz. 2009. Order Trombidiformes. In: Krantz, G. W., & D. E. Walter (eds) A Manual of Acarology 3rd ed. pp. 233–420. Texas Tech University Press.

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