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 Onchodellus squamosus (Koroleva, 1977) ( Fig. 4 ) Diagnosis Female with dorsal shield 576 long, 379 wide, (length/width ratio: 1.51). Dorsal shield setae J1 , J3–4 80, J2 86, J5 52 ( J4 / J5 ratio: 1.53). Sternal shield 200 long, 120 wide (length/width ratio: 1.66). Genitiventral shield 200 long, 216 wide (length/width ratio: 0.92). Anal shield 76 long, 120 wide (length/width ratio: 0.63). All idiosomal shields well reticulated. Soft lateral and opisthogastric integument with 14 pairs of smooth setae. Tarsus II with one spur-like distal seta pl1 , 35 long. Sperm access system with a long and thin spermathecal tube which widened distally, basal section of the sperm access system indistinct in the specimen examined. Material examined – 1 female , forest areas of the Imamzadeh Hashem, from soil under poplar tree, 17 June 2016 . World distribution – Georgia and Taiwan ( Koroleva 1977a , b; Ma et al . 2008 ; Mašán and Halliday 2014a ). Note – This is the first record of this species in Iran .