Gastrophylosis Patogens in ungulates kept in the steppe research field station “Orenburg Tarpania”

The fauna of gastrophylids was studied based on the collection of eggs and larvae of the 1st-3rd stages of development of bot fly of the family Gasterophilidae from kiang and horses of the Przhevalsk steppe scientific station “Orenburg Tarpania” and domestic horses of the village of Sazan. The Orenburg Province is inhabited by G. haemorrhoidalis (Linnaeus, 1758), G. inermis (Braurer, 1858), G. intestinalis (De Geer, 1776), G. nasalis (Linnaeus, 1758) and G. pecorum (Fabricius, 1794). We found G. intestinalis and G. nasalis. G. intestinalis is the most common species parasitizing solidungulate host animals. The infestation intensity for Przewalski horses and kiangs was low, the prevalence was 100%. Morphological features of the preimaginal forms in parasitic flies G. intestinalis and G. nasalis were caused by extreme conditions in the mammalian digestive tract.