Male Protzia eximia, copyright Holger Müller.

Belongs within: Hydrachnidia.
Contains: Euthyadinae, Hydryphantes, Wandesia, Neohydrachnidia, Neocalonyx.

The Hydryphantidae are a group of mostly sluggish water mites adapted for crawling in aquatic vegetation and detritus (Walter et al. 2009). A recent molecular phylogenetic study suggests that this family is paraphyletic to the Neohydrachnidia clade (Dabert et al. 2016). The family is divided between several subfamilies with members of the Wandesiinae and Tartarothyas have the lateral eyes reduced or absent.

Characters (from Walter et al. 2009): Adults with chelicera two-segmented; palpi chelate with dorsodistal portion of tibia bearing a short, thick seta extending beyond base of tarsus; idiosoma usually with varying degrees of plate or platelet development dorsally; genital acetabula conspicuous. Larvae with lateral eyes borne on separate platelets; movable digit of chelicera less than 1/3 length of basal segement; palptarsus with all setae slender; legs with six movable segments, with basifemur and telofemur separated; coxal plates II located near midlength of idiosoma with insertions of legs III located anterolaterally and legs III directed laterally; leg tarsi with unmodified claws and empodium; solenidia on leg tarsi slender.

    |    |--Hydrobaderia ilicaensisWL09
    |    `--HydryphantesDPD16
       |    |--WandesiaDPD16
       |    `--Euwandesia André & Naudo 1962RFF05
       |         |--E. sensitiva André & Naudo 1962RFF05
       |         |--E. tenebrio Hopkins & Schminke 1970S86
       |         `--E. vietsella Besch 1963S86
       `--+--Chimerathyas [Chimerothyadinae]DPD16
          |    `--C. cookiWL09
                  |    |--P. regalisGS96
                  |    `--P. steinmanniDW10
                  `--Protzia Piersig 1896DPD16, RFF05
                       |--P. eximiaS86
                       |--P. invalvaris Piersig 1898VBB91
                       |--P. lataGS96
                       |--P. rotundaCS91
                       `--P. salsa Goldschmidt & Gerecke 2003RFF05
Hydryphantidae incertae sedis:
  Eupatra rotunda Piersig 1906V25
  Cyclothyas [Cyclothyadinae]WL09
  Mamersa Koenike 1898H98 [MamersinaeWL09]
    `--M. corndorl Harvey 1988H98
  Cowichania Smith 1983S86 [CowichaniinaeWL09]
    `--C. interstitialis Smith 1983S86
  Eupatrella Walter 1935RFF05 [EupatrellinaeWL09]
    `--E. platano Goldschmidt & Gerecke 2003RFF05
  Ankelothyas Besch 1964RFF05 [AnkelothyadinaeWL09]
    `--A. emydoides Besch 1964RFF05
  Tartarothyas Viets 1934H98 [TartarothyadinaeWL09]
    |--T. boultoni Harvey 1987H98
    |--T. fonticola (Motas & Tanasachi 1957)S86
    `--T. micrommata Viets 1934S86
  Diplodontus Dugès 1834H98 [DiplodontinaeWL09]
    |--D. despiciensD01
    |--D. filipesB83
    |--D. haliki Lundblad 1947H98
    |--D. mandibulatus Lundblad 1947H98
    `--D. semiperforatusWP99
    |--Cyclohydryphantes Lundblad 1941WL09, H98
    |    |--C. mutarnee Harvey 1987H98
    |    `--C. trabeculiferus Lundblad 1941H98
    `--Pseudohydryphantes Viets 1907H98
         |--P. amatus Cook 1986H98
         |--P. aroona Harvey 1988H98
         |--P. bebelus Cook 1983H98
         |--P. cooki Harvey 1987H98
         |--P. crassipes Cook 1986H98
         |--P. doegi Harvey 1987H98
         |--P. mataranka Harvey 1988H98
         |--P. occabus Harvey 1987H98
         |--P. stylatus Cook 1986H98
         |--P. vepres Harvey 1987H98
         `--P. wangai Harvey 1988H98

*Type species of generic name indicated


[B83] Berlese, A. 1883. Acari, Myriopoda et Scorpiones hucusque in Italia reperta. Fascicle 3. Typis Fratelli Salmin: Patavii.

[CS91] Cicolani, B., & A. Di Sabatino. 1991. Sensitivity of water mites to water pollution. 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. 465–474. SPB Academic Publishing: The Hague.

[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.

[DW10] Dabert, M., W. Witalinski, A. Kazmierski, Z. Olszanowski & J. Dabert. 2010. Molecular phylogeny of acariform mites (Acari, Arachnida): strong conflict between phylogenetic signal and long-branch attraction artifacts. Molecular Phylogenetics and Evolution 56 (1): 222–241.

[D01] Daday, E. 1901. Édesvizi mikroszkópi állatok [Mikroskopische Süsswasserthiere]. In: Horváth, G. (ed.) Zichy Jenő Gróf Harmadik Ázsiai Utazása [Dritte Asiatische Forschungsreise des Grafen Eugen Zichy] vol. 2. Zichy Jenő Gróf Harmadik Ázsiai Utazásának Állattani Eredményei [Zoologische Ergebnisse der Dritten Asiatischen Forschungsreise des Grafen Eugen Zichy] pp. 375–470. Victor Hornyánszky: Budapest, and Karl W. Hierseman: Leipzig.

[GS96] Gerecke, R., & A. Di Sabatino. 1996. Historical zoogeography and evolution of habitat preference in water mites (Hydracarina) of the central Mediterranean region. In: Mitchell, R., D. J. Horn, G. R. Needham & W. C. Welbourn (eds) Acarology IX vol. 1. Proceedings pp. 523–527. Ohio Biological Survey: Columbus (Ohio).

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

[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.

[VBB91] Valdecasas, A. G., A. Baltanás & E. Bello. 1991. A preliminary assessment of single rocks for sampling water mites. 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. 503–507. SPB Academic Publishing: The Hague.

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

[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.

[WP99] Walter, D. E., & H. C. Proctor. 1999. Mites: Ecology, Evolution and Behaviour. CABI Publishing: Wallingford (UK).

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