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A study of the enchytraeid fauna was conducted at thirteen sites in the Caucasus, ten of which were located within the Utrish Nature Reserve (Russia) and three in Georgia. In total, sixteen distinct enchytraeid species were identified. Two new species from the genus Fridericia Michaelsen, 1889 are described, F. maeotica sp. nov., and F. elongata sp. nov.
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Degtyarev et al. (2026) studied this question.
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