A new sp of cheilostome bryozoan is reported from the Aegean. Numerous small colonies were found encrusting leaves of the eel grass Posidonia oceanica. Despite a superficial resemblance to spp of the genus Rhamphostomella, fundamental morphological differences are revealed. A new genus, Rhamphostomellina, is introduced to accomodate the sp, which is named R. posidoniae, in reference to its epiphytic habit.
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