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 Pachylaelaps Berlese, 1888 Pachylaelaps Berlese, 1888: 196 . Type species: Gamasus pectinifer G. Canestrini, 1881 , by subsequent designation (Berlese 1904). Diagnosis Dorsal shield with 30 pairs of setae. Setae J5 minute as microsetae or normal in length. Posterolateral margins of dorsal idiosoma with one or two pairs of hypertrophied slit-shaped 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 usually with 14–16 pairs of setae. Hypostomal corniculi long and sword-like. Palp apotele three-tined. Sperm access systems associated with coxae IV with variably formed spermathecal tubes. Femur I and genu I each with 13 setae (2-5/4-2 and 2-6/3-2, respectively). Tibia I with 12 setae (2-5/3-2). Female tarsus II with two spur-like distal seta ( pl1 and pl2 ). Genu III with seven setae (1-4/1-1).