Contribution to the Pachylaelapidae (Acari: Mesostigmata) fauna in some parts of Guilan province of Iran Author Mojahed, Samaneh . Department of Plant Protection, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran; E-mails: samaneh. mojahed @ yahoo. com, hajizadeh @ guilan. ac. ir, Rhosseini @ guilan. ac. ir Author Hajizadeh, Jalil . Department of Plant Protection, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran; E-mails: samaneh. mojahed @ yahoo. com, hajizadeh @ guilan. ac. ir, Rhosseini @ guilan. ac. ir Author Hosseini, Reza . Department of Plant Protection, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran; E-mails: samaneh. mojahed @ yahoo. com, hajizadeh @ guilan. ac. ir, Rhosseini @ guilan. ac. ir Author Ahadiyat, Ali . Department of Entomology, Science and Research Branch, Islamic Azad University, Tehran, Iran; E-mails: ali. ahadiyat @ hotmail. com & a. ahadiyat @ srbiau. ac. ir text Persian Journal of Acarology 2017 2017-10-15 6 4 269 285 https://www.mendeley.com/catalogue/b291baa7-d39d-322b-b94d-4d97866901cf/ journal article 10.22073/pja.v6i4.29712 2251-8169 7174046 Genus Onchodellus Berlese, 1904 Pachylaelaps ( Onchodellus ) Berlese, 1904: 452 . Type species: Pachylaelaps ( Onchodellus ) reticulatus Berlese, 1904 , by monotypy. Diagnosis Dorsal shield with 30 pairs of setae. Setae J5 normally developed, needle-like. Posterolateral margins of dorsal idiosoma with one or two pairs of gland pores. Sternal shield fused to metasternal platelets and endopodal elements, bearing four pairs of setae. Peritrematal shields fused to exopodal elements, and developed posteriorly. Genitiventral shield enlarged, closely adjacent to subtriangular anal shield. Soft integument with 10–15 pairs of setae. Hypostomal corniculi short and horn-like. Palp apotele three-tined. Sperm access systems associated with coxae III with long and fine spermathecal tubes. Genu I with 12 setae (2-5/3-2). Female tarsus II with one spur-like distal seta ( pl1 ). Genu IV and tibia IV each with seven setae (1-4/1-1 and 1-3/2-1, respectively).