Coexistence of symbiotic hydroids (Protulophila) on serpulids and bryozoans in a cryptic habitat at Chrtníky (lower Turonian, Czech Republic)

Abstract

This study provides the first record and description of the hydroid Protulophila gestroi Rovereto, 1901 from the Bohemian Cretaceous Basin (Czech Republic). The hydroid colony was bioclaustrated by a serpulid tube on the underside of a platy sponge, which is also encrusted by three species of bryozoans and an oyster. The Bohemian specimen differs from previously described specimens of P. gestroi in having zooidal orifices with broad sinuses.