The water mites of the family Hygrobatidae (Acari, Hydrachnidia) in Italy Author Gerecke, Reinhard text Zootaxa 2021 2021-07-30 5009 1 1 85 http://dx.doi.org/10.11646/zootaxa.5009.1.1 journal article 10.11646/zootaxa.5009.1.1 1175-5326 5157635 3E5643F0-BBC2-45FA-83E5-07FEF6ECB690 Atractides ( s. str. ) giustinii Gerecke & Di Sabatino, 2013 (Figs 29 C-D; 31 G) Previoulsy published records from Italy : Sardegna ( Gerecke 2014b ) Remarks: In the redescription of A. gracilipes , Gerecke (2014b) did not mention its similarity to A. giustinii . Common features are the excretory pore with ring-shaped sclerotization, fusion of Vgl-1+2, convex anterior margin of male genital plate, and a slightly enlarged I-L-5. In addition to a distinct difference in size – both sexes of A. giustinii are minor in nearly all measurements – the two species differ as follows ( A. gracilipes in parentheses): Atractides giustinii has relatively shorter palp segments P-3 and P-4 - relative L 24-25 (26), resp. 32-33 (38) %, P- 2/P-4 ratio> 0.6 (<0.6); a slenderer P-3, with L/H ♂♂ > 1.8 (<1.8), ♀♀ > 2.2 (<2.1), a stouter P-4, with L/H ♂♂ <3.2 (> 3.4), ♀♀ <4.0 (> 4.5). Clear differences are found also in proportions of the first leg: ventral margin I-L-5 relatively shortened, I-L-5 dL/vL ratio> 1.4 (<1.4); S-1/-2 distance ♂♂ > 20 (15), ♀ > 35 (25), both setae shorter; I-L- 6 in the centre not as strongly narrowed as in A. gracilipes . Habitat: Rhithrobiont, crenophilous. Distribution: Corsica , Sardinia.