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Thinozercon
Taxonomic Position
Cohort Uropodina
Subcohort Uropodiae
Superfamily Thinozerconoidea Trägårdh
Family Thinozerconidae Trägårdh
Thinozercon Halbert
Diagnostic characters:
Uropodine mesostigmatans with peritrematal shields joined to vertex, but separate from large anterior shield, and separate pygidial shield
<100 dorsal idiosomal setae
Scabellum and pedofossae absent
Peritremes recurved basally, extending to vertex
Sternal shield divided medially, bearing st1 and united with endopodal elements
Mesogynal shield small
Strap-like latigynal shields bearing st5.
Large ventrianal shield flanked by large, nude metapodal shields; 3 circumanal setae.
Coxae I cylindrical, widely separate.
Chelicerae elongate, apparently raptorial, sometimes snapping, appearing 4-segmented in Thinozercon
Corniculi horn-like.
Similar taxa. Thinozerconoids
are considered the most early derivative of living Uropodina and are
distinguished from the other superfamilies primarily on their plesiomorphic
chaetotaxy.
Ecology. The Thinozerconoidea are a small, but intriguing group of mites associated with wet habitats and appear to have originated near the base of the Uropodina. Thinozercon occur in decaying tidal debris.
References
Ainscough, BD. 1981. Uropodine studies. I. Suprageneric classification in the cohort Uropodina Kramer, 1882 (Acari: Mesostigmata). International Journal of Acarology 7:47-56.
Athias-Binche F. 1982. A redescription of Thinozercon michaeli Halbert, 1915 (Uropodina: Thinozerconoidea). Proceedings of the Royal Irish Academy Dublin 82B: 261-276.
Evans
EO and Till WM. 1979. Mesostigmatic mites of Britain and Ireland
(Chelicerata: Acari-Parasitiformes). An
introduction to their external morphology and classification. Transactions of the Zoological Society of
London 35 (2): 145-270.
Gilyarov MS & Bregatova NG (eds). 1977. Handbook for the Identification of Soil-inhabiting Mites, Mesostigmata. Zoological Institute of the Academy of Sciences: Petrograd [In Russian]
Johnson,
DE. 1961. A review of the lower uropodid mites (former Thinozerconoidea,
Protodinychoidea and Trachytoidea) with notes on the classification of the
Uropodina (Acarina). Acarologia
3: 522-545.
Krantz, GW
& Ainscough, B. 1990. Mesostigmata. pp. 583-665, in DL Dindal (ed) Soil Biology
Guide. John Wiley & Sons: Brisbane.