Freshwater Halacarid Mites (Acari: Halacaridae) From Madagascar. New Records And The Description Of A New Species Author Bartsch, I. text Acarologia 2013 2013-03-29 53 1 77 87 http://dx.doi.org/10.1051/acarologia/20132080 journal article 10.1051/acarologia/20132080 2107-7207 5392049 GENUS Ropohalacarus BARTSCH, 1989 Type species — Porohalacarus uniscutatus Bartsch, 1982 . Diagnosis — Anterior and posterior dorsal plate fused, ocular plates reduced to minute sclerites or absent. Gland pores reduced. Dorsum with four to five pairs of idiosomatic setae; adanal setae lacking. Anterior and posterior epimeral plates and genitoanal plate fused. Area representing anterior epimeral plate with three pairs of setae, posterior epimeral plates with two to three setae. Female with three pairs of acetabula, all on genital sclerites, and two to three pairs of perigenital setae on genitoanal plate. Subgenital setae lacking. Palps foursegmented, attached dorsolaterally. Second palpal segment with one to two similar-sized setae, third palpal segment with small medial spur, fourth palpal segment with conspicuously wide seta. First and second pair of legs similar in shape. Genua of all legs shorter than both telofemora and tibiae. Tarsi I to IV with 4, 3-4, 3, 2 dorsal and 0-1, 0-1, 0, 0 ventral setae. Solenidia on tarsi I and II in dorsolateral position. Paired claws large, central sclerite with small, dent-like process. Remarks — Two species are known, both preliminary inhabit the groundwater, in the hyporhithral and springs.