Fifth contribution to the knowledge of water mites (Acari: Hydrachnidia) from the Comoros: a checklist and description of one new genus and four new species.

New records of water mites (Acari: Hydrachnidia) from the Comoros are presented. One genus, i.e. Lagoenaxonopsalbia Pešić Smit, and four species, i.e. Platymamersopsis mayottensis (Anisitsiellidae), Torrenticola mayottensis (Torrenticolidae), Lagoenaxonopsalbia comorosensis (Aturidae) and Djeboa davecooki (Mideopsidae) are described as new to science. Arrenurus comorosensis Pešić Smit, 2015 is synonymized with Arrenurus flavus Smit, 2012. The first description of the female of Sterkspruitia comorosensis Pešić Smit, 2015 is given. The number of water mites known from Comoros now tallies 17 species in ten families.