301 The boring ctenostomate Bryozoa: taxonomy and paleobiology based on cavities in calcareous substrata

The boring ctenostomate Bryozoa: taxonomy and paleobiology based on cavities in calcareous substrata - BAP #301 The boring Bryozoa (Upper Ordovician-Recent) live immersed in calcareous substrata that the organism penetrates by purely chemical means. All known species are here assigned to the order Ctenostomata Busk, 1852, [Including Penetrantia Silén, 1946]. Until now, the group has been known in anatomical detail almost exclusively from studies on the internal soft parts of Holocene species. Fossil remains of these bryozoans have been confused with various borings and shallow pits of diverse origin.             The classification of previously recognized species is revised, and 13 genera including 48 species are recognized. There are six new genera: Casterogenera, Cookobryozoon, Fischerella, Marcusopora, Orbignyopora, and Voigtella. Casteropora and Fischerella are assigned to the Bryozoa with slight reservation. The following 20 new species are erected: Cookobryozoon lagaaiji, Immerge