تنوع گونه‌ای نماتدهای همه‌چیزخوار (dorylaims) جنگل‌های ارسباران- استان آذربایجان‌شرقی

The dorylaim nematodes represent a large group of soil nematodes. These animals consist of very diverse forms and huge number of species as well as different life styles (predators, free living, plant parasites and plant virus vectors) and wide host range. The nematodes are involved in many soil food chains and webs and are considered as soil health bioindicators. Therefore, in order to study the diversity of dorylaimid nematodes in Arasbaran forests, many soil samples from the rhizosphere of trees were collected in different seasons during 2015-2016. Extraction, killing, fixation and permanent and temporary microscopic slides preparation of the nematodes were carried out based on routine nematology methods. Identification was done using related valid literature and keys based on morphological and morphometrical characters obtained by light microscope and drawing tube attached to it. Finally, 19 species including Syncheilaxonchium nairi, Paravulvus hartingii, Eudorylaimus spaulli, Epidorylaimus lugdunensis, Nygolaimus brachyuris, Paraxonchium carmenae, Metaxonchium persicum, Discolaimus mariae, Heterodorus sp., Longidorella saadi, Sectonema demani, Xiphinema macroacanthum, X. vuittenezi, X. utahense Longidorus africanus, Tylencholaimus constritcus, T. tahatikus, Xiphinemella globilabiata and Enchodelus macrodorus belonging to 16 genera and 10 families of dorylaims were identified Xiphinema and Tylencholaimus with more than one species, show more species diversity compared to others. Meanwhile, the families of Nordiidae and Qudsianeamtidae have the highest diversity in the studied areas, with three genera (Longidorella, Enchodelus, Heterodors) and three genera (Epidorylaimus, Eudorylaimus, Discolaimus), respectively. Four species namely, Discolaimus mariae, Sectonema demani, Xiphinema utahense and Tylencholaimus tahatikus are new records for nematode fauna of Iran and there is no previous report of these nematodes from the country.