Forty-four species of rotifers have been identified in Minorca inland waters. Permanent ponds, temporary pools, flowing waters, and artificial pools were sampled. Most of the species are new records for the island and twentynine are new to the Balearic Isles. The families Brachionidae and Lecanidae provide half of the taxa. Keratella procurva (Thorpe, 1912), which is considered a subtropical species, occurred with a widespread distnbution in the island. Different taxa and «Formenkreis» found

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... mentioned. Original drawings and scanning photomicrographs of some species are presented. Typical assemblages of populations from every environment are also described.