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 Halacarellus obsoletus Bartsch, 1995 Report associated with sponges: This species was reported among hexactinellid Rossella antarctica , R. nuda , R. racovitzae , and Anoxycalyx ( Scolymastra ) joubini (cited as Scolymastra joubini ) collected from eastern Weddell Sea ( Bartsch 1995 ). Remarks : According to the mite's morphology, it is specialized for a life in sponge tissue ( Bartsch 1995 ).