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About 51 species belonging to 2 Orders, 7 Families, and 20 Genera were recognized.
The present review is based on ten systematic studies recording the species found in the region.
The largest number of species recorded was 23 species at the Al-Qurnah station and 14 species in
each of the Al-Hartha and Al-'Ashar stations. It was found that the most common species in the
Shatt Al-Arab River were Chydorus sphaericus and Simocephalus (Simocephalus)vetuloides.
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