New zerconid mites (Acari: Mesostigmata: Zerconidae) from Canada, with a review of the genus Mixozercon Halašková, 1963 Author Díaz-Aguilar, Irma Author Ujvári, Zsolt text Zootaxa 2010 2555 1 29 journal article 10.5281/zenodo.196913 18a5c6e5-8297-458d-9e07-ba5e9de6e6b2 1175-5326 196913 Mixozercon sellnicki ( Schweizer, 1948 ) Parazercon sellnicki Schweizer, 1948 : 23 . Zercon sellnicki .― Sellnick, 1958 : 337 ; Schweizer, 1961 : 166 ; Karg, 1971 : 309 ; Petrova, 1977 : 591 . Mixozercon sellnicki .― Halašková, 1963 : 206 ; 1969a: 343; Błaszak, 1974 : 49 ; Karg, 1993 : 329 ; Mašán & Fenďa, 2004 : 56 ; Błaszak et al ., 2007 : 104 . Diagnosis. Central and submarginal setae of podonotum smooth, except j1 and j2 longer and pilose. Setae J1- J2 and Z1 short, smooth, J3-J5 and Z2-Z3 short, pilose, other J-, Z- and S-setae elongate, brush-like, plumose. Setae R1 pilose, longer than other R-setae, which are smooth and thorn-like. Setae J5 situated between dorsal cavities. No dorsal seta long enough to reach the base of the following seta. Setae S1 situated lateral to Z1. Pores Po2 situated on a line connecting Z2 and S1. Podonotum covered by tile-like pattern; distinct punctation present on whole opisthonotum. Dorsal cavities well-sclerotised, saddle-like, with smooth anterior margin. Adgenital and post-genital sclerites absent. Distribution. Iceland , Sweden , Switzerland , Germany , Latvia , Poland , Slovakia and Romania . Remarks. We examined the type material of the species deposited in the Natural History Museum of Basel ( syntypes on slides He 159, He 170 and He 176). On the slides labelled as “ Parazercon sellnicki ” there are also other mesostigmatid mite species, which might be confusing. Schweizer (1948) designated five females and two males as syntypes , but we found no male specimens on the slides. In Slovakian specimens found by Halašková (1963) , setae j2 are short and smooth, and J2 are pilose, which was insufficient for establishing a new taxon, perhaps as a result of intraspecific variation. In a later diagnosis of Halašková (1969a) , J2 is described as smooth. In Halašková’s drawing there is only one pair of setae on the anterior margin of the ventri-anal shield, but Błaszak (1974) , Halašková (1969a) and Błaszak (1979) indicated that there are two pairs of setae in that position. The second pair of ventri-anal setae on the anterior margin of ventri-anal shield was probably present but not clearly visible, according to the diagnosis in Halašková (1969a) .