Hydrachna williamsoni Soar, 1908

Davids, Kees, Sabatino, Antonio Di, Gerecke, Reinhard, Gledhill, Terence & Smit, Harry, 2005, On the taxonomy of water mites (Acari: Hydrachnidia) described from the Palaearctic, part 1: Hydrachnidae, Limnocharidae and Eylaidae, Zootaxa 1061, pp. 36-64 : 51

publication ID	https://doi.org/ 10.5281/zenodo.170186
DOI	https://doi.org/10.5281/zenodo.6267656
persistent identifier	https://treatment.plazi.org/id/03F7DE69-B05B-FFFA-FEF6-FCE7FDBD852B
treatment provided by	Plazi
scientific name	Hydrachna williamsoni Soar, 1908
status

Treatment

Species incerta

Material examined: Female, NHML, C.F.G. "Dr. C. F. George coll. 1925 VI 24 144". "Lincolnshire Dr.C.F.George Coll. 1925 VI 24. 144. Balsam, 1904". Location of holotype unclear.

Discussion: The only specimen known in European collections is obviously a juvenile. From many points of view it is similar to H. processifera (frontal area with poorly developed, roundish sclerite dots near postocularia, general shape of genital field, with L/ W 400/700, Cx4 with a hooklike extension directed laterally). The transverse position of the gnathosoma and its appendages does not allow for measurements. As proposed by Gledhill & K.O. Viets (1976), this species should be considered a species incerta and not listed in faunistic inventories.