The Aeolosomatidae is a family of very small, aquatic annelid worms, between 0.3 and 10 mm in length and 0.04-0.06 mm in diameter. About 30 species have been described in three genera. These worms are known as suction-feeding worms and occupy freshwater, brackish, and saltwater habitats. They are bottom and sediment dwellers, inhabiting spaces around aquatic plants and the detritus-rich sands and sediments of freshwater habitats (microfauna)

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