Insects of Uzbekistan and their role in the biology of spirurid parasites of vertebrate animals

The study was focused on some features of the fauna of the larval forms of nematodes of the Spirurida order, which develop in the organisms of insects of Uzbekistan belonging to the orders Coleoptera and Diptera. The examination of 12,744 specimens of insects from three regions (Central, NorthEastern, and North-Western) of Uzbekistan revealed their infection with the larval stages of spirurids. The examined coleopterans belonged mainly to the families Carabidae, Scarabaeidae, and Tenebrionidae, whereas dipteran hosts were represented by Culicidae, Simuliidae, and Muscidae. The total infection rate of the studied insects ranged from 1.3% to 10.5%. The highest infection rate was recorded in lamellar beetles (10.5%). Sixteen species of spirurid larvae belonging to six families were identified: Spiruridae – Spirura rytipleurites and Spirura talpae; Spirocercidae – Ascarops strongylina and Mastophorus muris; Gongylonematidae – Gongylonema neoplasticum and Gongylonema pulchrum; Habronematidae – Parabronema skrjabini; Onchocercidae – Dirofilaria immitis, Dirofilaria repens, Setaria labiatopapillosa, Setaria equina, Onchocerca lienalis, and Onchocerca gutturosa; and Filariidae – Parafilaria multipapillosa, Stephanofilaria stilesi, and Stephanofilaria assamensis. The intensity of infection ranged from 1 to 20 larvae per infected insect. The final hosts of the noted larvae turned out to be representatives of many orders of mammals. Original data on the morphobiological characteristics of the nematode larvae of the Spirurida order are presented.

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