Abstract
The current study discusses the spatial distribution of Oligochaete communities on Shatt Al-Hillah. Monthly samples of Oligochaete worms were gathered from four locations along the Shatt Al-Hillah in the middle of Iraq, between September 2019 and May 2020. show the study for the existence of521Individual aquatic Oligochaeta belong to 7 species from the Naididae and Lumriculdae subfamilies, as well as the Pristinae subfamily, and in Site S3 had the largest number of worms, with 180 worms from 7 species being detected, while in Site S2 had the least number of worms, 107 from 5 species. The largest individual numbers were registered in February, while the lowest were recorded in April. The species, Prisma aequiseta, was first recorded, in the Shatt Al-Hillah rive. Show tubificid worms, Branchuira sowerbyi, and Limnodrilus hoffmeisteri were the most abundant species in the Shatt Al-Hillah.
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