Validation of the names of four species of laelapid mites (Mesostigmata: Laelapidae) parasitic on sigmodontine rodents (Rodentia: Cricetidae) Author Lareschi, Marcela 0000-0002-5300-9100 Centro de Estudios Parasitológicos y de Vectores (CONICET-UNLP). Bv. 120 s / n e / 60 y 64, 1900 La Plata, Argentina. Corresponding author. & mlareschi @ cepave. edu. ar; https: // orcid. org / 0000 - 0002 - 5300 - 9100 mlareschi@cepave.edu.ar Author Savchenko, Ekaterina 0000-0002-1425-8681 ekaterina @ cepave. edu. ar; https: // orcid. org / 0000 - 0002 - 1425 - 8681 ekaterina@cepave.edu.ar text Zootaxa 2021 2021-11-30 5072 3 298 300 journal article 3212 10.11646/zootaxa.5072.3.7 b12f2270-6665-4332-8f6f-ac5804efdf9b 1175-5326 5744764 472318EB-4A1C-42E3-A569-BAAC466084DC Laelaps schatzi sp. nov. Laelaps schatzi Savchenko & Lareschi, 2019 : 105146 , Figs 2–3 (unavailable name). Laelaps schatzi was described on the basis of the female. The species is unique in having short genitoventral setae (≤114 μm), reticulated surface pattern on the genital shield from the level of Zv1 to the posterior margin, and by the presence of one or two additional unpaired setae between J4 on the dorsal shield. See Savchenko & Lareschi (2019) for the full description. Type material. HOLOTYPE : female ( MLP-CNP6316 /M7) ex Oligoryzomys flavescens , Pereyra, Partido de Berazategui , Buenos Aires , Argentina ( 34°50′13.84″S , 58°5′23.40″W ) . PARATYPES : 14 females ex Oligoryzomys flavescens , Pereyra, Partido de Berazategui , Buenos Aires , Argentina ( 34°50′13.84″S , 58°5′23.40″W ) ( MLP-CNP6314 / M1-M5, MLP-CNP6315 /M6, MLP-CNP6316 /M8, MLP-CNP6318 /M09-10, MLP-CNP6311 /M11-12, MLP-CNP6312 / M12-13, MLP-CNP6313 /M14, MLP-CNP6317 /M15) . Etymology. The new species was named in honour of Heinrich Schatz (Innsbruck, Austria ) renowned soil ecologist and acarologist who advised E. Savchenko during her bachelor studies and stayed as a true friend over the years. Type host. Oligoryzomys flavescens Waterhouse ( Cricetidae : Sigmodontinae) ( CNP 6316, housed at the Anexos de la Colección de Mamíferos del Centro Nacional Patagónico ( CNP ), Puerto Madryn, Chubut , Argentina ). Type locality. Pereyra, Partido de Berazategui , Buenos Aires , Argentina ( 34°50′13.84″S , 58°5′23.40″W ) .