Surveying 59 references concerning the occurrence of the monogeneans of the families Ancylodiscoididae and Ancyrocephalidae parasitizing fishes of Iraq showed the occurrence of 11 taxa of the family Ancylodiscoididae (genera Ancylodiscoides, Bychowskyella, Chauhanellus, Hamatopeduncularia and Thaparocleidus) and 19 taxa of the family Ancyrocephalidae (genera Ancyrocephalus, Cichlidogyrus, Cleidodiscus, Haliotrema, Ligophorus and Mastacembelocleidus). These monogeneans were reported from 19 valid fish host species in Iraq. Apart from five parasite species which were recorded from marine habitats (Ancyrocephalus sp., Chauhanellus australis, Haliotrema mugilis, Hamatopeduncularia sp. and Ligophorus mugilinus), the remaining parasite species were recorded from freshwater habitats. Among the infected fishes with these parasites, the Tigris catfish Silurus triostegus was infected with the highest number of parasite species (11 species), the mugilid fishes (Planiliza abu and P. subviridis) were infected with eight and seven parasite species, respectively, while 11 fish species were infected with only one parasite species each. Among the parasite species, Thaparocleidus vistulensis was reported from nine fish host species, while 22 parasite species were reported from one host species each. So far, eight synonymous names were applied for seven valid names of parasites of these two families in Iraq.

Four new Dactylogyrus species are described and two redescribed from cyprinids of the River Tigris, Iraq. These are as follows: Dactylogyrus barbioides n. sp. from Barbus grypus; D. orbus n. sp. from Barbus lacerta; D. barbuli n. sp. from Barbus barbulus; D. macrostomi n. sp. from Cyprinion macrostomi; D. pavlovskyi Bychowsky, 1949 from Barbus grypus and Barbus sharpeyi; and D. inutilis Bychowsky, 1949 from Barbus xanthopterus. A phylogenetic and zoogeographical analysis is presented.

Surveying the literature concerning the occurrence of the monogeneans of the genus Gyrodactylus parasitizing fishes of Iraq indicated that there are 25 nominated species of this genus on 29 fish species. These are:

The monogenean Gyrodactylus bychowskianus Bogolepova, 1950 is recorded in the present study for the first time in Iraq from the gills of the cyprinid fish Arabibarbus grypus (Heckel, 1843); which was collected from the Tigris River at Al-Taji Beach north of Baghdad Province during the period from July until November 2018.

تم جمع ما مجموعه 578 سمكة ، تنتمي إلى 19 نوعًا ، من منطقة الغريات على نهر دجلة في محافظة بغداد خلال الفترة من يوليو 2015 حتى نهاية مارس 2016. وأظهرت النتائج حدوث ثمانية أنواع من جنس Gyrodactylus Nordmann 1832 (Monogenea: Gyrodactylidae). ومن بين هذه الطفيليات، وسجلت أربعة أنواع لأول مرة في العراق وهي: G. comephori ، G . ibragimovi ، G . macronychus و G . MASU. أيضا ، تم اعتبار سبعة أنواع من الأسماك كمضيفين جدد لأربعة أنواع من الطفيليات المدروسة. أعطيت وصف وقياسات هذه الطفيليات وكذلك الرسوم التوضيحية الخاصة بهم.