A checklist of halacarid and hydrachnid mites (Acari, Halacaridae & Hydrachnidia) associated with sponges (Porifera) Author Chatterjee, Tapas text Zootaxa 2021 2021-11-29 5072 2 101 129 journal article 3184 10.11646/zootaxa.5072.2.1 37781dcd-ffff-4c1e-9483-fb726b42b440 1175-5326 5733656 F11C5EFE-8B45-4F58-B7E9-741D27EB47B6 Unionicola ( Hexatax ) tenuis (Lundblad, 1935) Report associated with sponges: This species was mentioned under possible ‘sponge-mite’ species in North America ( Vidrine 1996 ; Edwards & Vidrine 2013 ). Remarks : This needs further study (emphasizing on developmental study) of this mite to get a better idea about its association with freshwater sponges. This species was reported from Haiti (Lundblad 1935), Oaxaca State , Mexico ( Cook 1980 ), Guatemala ( Viets 1975 ), and the Panama Canal Zone ( Gliwicz & Biesiadka 1975 ). Viets (1975) suggests that Stoll's (1877) species may have been U. gracilipalpis tenuis . Unionicola ( Unionicola ) gracilipalpis tenuis (Lundblad, 1935) reported by Vidrine et al . (1986) associated with sponges Dosilia radiospiculata from Louisiana , North America was kept under synonym of Unionicola ( Unionicola ) gracilipalpis in Vidrine (1996) . Unionicola tenuis was reported in the mussel communities (Aufwuchs communities containing sponges) from Cajun Prairie ecosystem in Southwestern Louisiana , USA ( Vidrine et al . 2004 ). Apparently, U. gracilipalpis and U. tenuis in Louisiana are not clearly separable (Vidrine, Personal communication).