The genera Cribrilina and Collarina (Bryozoa, Cheilostomatida) in the British Isles and North Sea Basin, Pliocene to present day

Seven species assigned to the genus Cribrilina are illustrated by scanning electron microscopy (SEM) and redescribed. At the present day, three species occur in the area studied: C. punctata (Hassall), C. cryptooecium Norman and C. annulata (Fabricius). The presence of Collarina balzaci (Audouin), which has previously been confused with Cribrilina punctata , is also reported. The following species of Cribrilina are known as Pliocene and Pleistocene fossils: C. punctata, C. cryptooecium, C. watersi Andersson, C. puncturata (Wood) and C. mucronata Canu & Lecointre. In addition, C. annulata and C. spitsbergensis Norman have been reported as fossils, but these occurrences could not be confirmed here by the examination of actual material. Lectotypes are selected for C. spitsbergensis, C. watersi, C. puncturata and C. mucronata. Type material of the American fossil C. marylandica , which has been synonymised with C. punctata , is illustrated.