Probable predatory borings in late Cretaceous bryozoans

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Abstract
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 .mu.m. 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 1 zooid at a time. The predator responsible may have been a gastropod, most probably a nudibranch or a micromorphic muricid.