Lateral view of dorsal plates (A) and ventral plates (B) of Microtritia minima, from Balogh & Balogh (1992, vol. 2).

Belongs within: Holonota.
Contains: Austrotritia, Mesotritia, Oribotritia, Indotritia, Euphthiracarus, Acrotritia.

The Euphthiracaroidea are a group of ptychoid mites in which the body is strongly compressed laterally. Retraction of the legs is facilitated by relaxation of the notogaster to increase its volume (Norton 2001). In the family Synichotritiidae, the genital setae are in an antaxial position, in groups or transverse rows, while the Oribotritiidae and Euphthiracaridae both have the genital setae in a paraxial position, in a longitudinal row. The latter two families are distinguished in that the Euphthiracaridae have the ventral (anal and genital) plates fused into a single plate pair, while the Oribotritiidae have them at least partially separated. In the Bornean Temburongia patoi, the sides of the notogaster are produced ventrolaterally into two lobes that contact each other medially, in contrast to the simple notogastral margins leaving the V-shaped ventral region exposed in other genera (Balogh & Balogh 1992).

Characters (from Balogh & Balogh 1992): Body considerably compressed laterally, ptychoid (legs can be withdrawn and aspis closed against the notogaster and ventral region); notogaster without transverse sutures; anogenital region narrow, V-shaped, of macropyline type (genital and anal plates not separated by a ventral plate), occupying entire length of ventral region.

    |--Synichotritiidae S04
    |    |--Apotritia Norton & Lions 1992 S04
    |    |    `--*A. walkeri Norton & Lions 1992 S04
    |    |--Temburongia Mahunka 1990 [Temburongiidae] S04
    |    |    `--*T. patoi Mahunka 1990 S04
    |    |--Synichotritia Walker 1965 S04
    |    |    |--*S. caroli Walker 1965 S04
    |    |    |--S. longipila Niedbala 2002 S04
    |    |    |--S. parvipilosa Niedbala 2002 S04
    |    |    `--S. spinulosa Walker 1965 S04
    |    `--Sabahtritia Mahunka 1987 S04
    |         |--*S. hauseri Mahunka 1987 S04
    |         |--S. foveolata (Hu, Wang & Aoki 1991) [=Synichotritia foveolata] S04
    |         |--S. furcata (Hu & Wang 1992) [=Synichotritia furcata] S04
    |         |--S. lienhardi Mahunka 1995 S04
    |         |--S. mirabilis Mahunka 1991 S04
    |         |--S. sarawak Mahunka 1996 S04
    |         `--S. tianmuensis (Hu, Wang & Aoki 1991) [=Synichotritia tianmuensis] S04
    |--Oribotritiidae S04
    |    |--Austrotritia S04
    |    |--Mesotritia S04
    |    |--Oribotritia S04
    |    |--Indotritia S04
    |    |--Paratritia Moritz 1966 S04
    |    |    `--*P. baloghi Moritz 1966 S04
    |    |--Terratritia Ramsay & Sheals 1969 S04
    |    |    |--*T. askewi Ramsay & Sheals 1969 S04
    |    |    `--T. seconda Mahunka 1991 S04
    |    |--Sabacarus Ramsay & Sheals 1969 S04
    |    |    |--*S. corneri Ramsay & Sheals 1969 [incl. S. ranokaoensis Hammer 1970] S04
    |    |    `--S. japonicus Shimano & Aoki 1997 S04
    |    |--Maerkelotritia Hammer 1967 S04
    |    |    |--M. kishidai (Aoki 1958) (see below for synonymy) S04
    |    |    |--M. crytopa (Banks 1904) (see below for synonymy) S04
    |    |    `--M. krivolutskyi Märkel 1968 S04
    |    |         |--M. k. krivolutskyi S04
    |    |         `--M. k. mongolica Mahunka 1981 S04
    |    `--Protoribotritia Jacot 1938 S04
    |         |--*P. canadaris Jacot 1938 S04
    |         |--P. aberrans (Märkel & Meyer 1959) [=Oribotritia aberrans] S04
    |         |--P. africana Mahunka 1985 S04
    |         |--P. ensifer Aoki 1969 [=P. aberrans ensifer] S04
    |         `--P. oligotricha Märkel 1963 S04
    `--Euphthiracaridae [Euphthiracarini] S04
         |--Euphthiracarus S04
         |--Acrotritia S04
         |--Bukitritia Mahunka 1990 S04
         |    `--*B. timah Mahunka 1990 S04
         |--Sumatrotritia Mahunka 1989 S04
         |    |--*S. inusitata Mahunka 1989 S04
         |    |--S. elegans Mahunka 1991 S04
         |    `--S. murphyi Mahunka 1999 S04
         `--Microtritia Märkel 1964 S04
              |--*M. minima (Berlese 1904) (see below for synonymy) S04
              |--M. contraria Niedbala 1993 S04
              |--M. fissurata Märkel 1968 S04
              |--M. fusa Niedbala 2000 S04
              |--M. glabrata Niedbala 1993 S04
              |--M. hauseri Mahunka 1993 [incl. M. altissima Mahunka 1994] S04
              |--M. hawaiiensis Niedbala 1994 S04
              |--M. incisa Märkel 1964 S04
              |--M. neonominata Subías 2004 [=M. glabrata Starý 1993 non Niedbala 1993] S04
              |--M. schusteri Märkel 1964 S04
              |--M. similis N01
              |--M. simplex (Jacot 1930) S04 (see below for synonymy)
              |--M. striatissima Mahunka 1999 S04
              |--M. tropica Märkel 1964 S04
              |    |--M. t. tropica [incl. M. ethiopica Mahunka 1988] S04
              |    `--M. t. dusan Ramsay & Sheals 1969 S04
              `--M. tumida Niedbala 1988 S04

Maerkelotritia crytopa (Banks 1904) [=Phthiracarus crytopus; incl. Oribotritia gibbera Walker 1965, P. maximus Ewing 1913] S04

Maerkelotritia kishidai (Aoki 1958) [=Oribotritia kishidai; incl. *M. alaskensis Hammer 1967, O. sellnicki Walker 1965] S04

*Microtritia minima (Berlese 1904) [=Phthiracarus minimus; incl. Tritia (Pseudotritia) minuta Willmann 1919, Microtritia silofila Subías 1975] S04

Microtritia simplex (Jacot 1930) S04 [=Pseudotritia simplex S04; incl. Rhysotritia paeneminima Walker 1965 S04, Microtritia paeneminima NP91]

*Type species of generic name indicated


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

[N01] Niedbała, W. 2001. Study of the diversity of Ptyctima (Acari: Oribatida) and quest for centres of its origin: the fauna of the Oriental and Australian regions. In: Halliday, R. B., D. E. Walter, H. C. Proctor, R. A. Norton & M. J. Colloff (eds) Acarology: Proceedings of the 10th International Congress pp. 143–148. CSIRO Publishing: Melbourne.

Norton, R. A. 2001. Systematic relationships of Nothrolohmanniidae, and the evolutionary plasticity of body form in Enarthronota (Acari: Oribatida). In: Halliday, R. B., D. E. Walter, H. C. Proctor, R. A. Norton & M. J. Colloff (eds) Acarology: Proceedings of the 10th International Congress pp. 58–75. CSIRO Publishing: Melbourne.

[NP91] Norton, R. A., & S. C. Palmer. 1991. The distribution, mechanisms and evolutionary significance of parthenogenesis in oribatid mites. In: Schuster, R., & P. W. Murphy (eds) The Acari: Reproduction, development and life-history strategies pp. 107–136. Chapman & Hall: London.

[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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