Borings are described in zooids of Cenomanian to Campanian melicerititids, an aberrant group of cyclostome bryozoans with calcified opercula. The borings are circular or elliptical, straight‐sided and have a diameter of 40–90 μn. Autozooids were drilled in preference to heterozooids and most borings penetrate the operculum. The shape and distribution of boreholes suggests that they were made by a predator attacking one zooid at a time. The predator responsible may have been a gastropod, most probably a nudibranch or a micromorphic muricid.Bryozoa, Gastropoda, predation, borings, Upper Cretac
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