Holophragma


Holophragma is an extinct genus of rugose coral known from Ordovician and Silurian rocks in Scandinavia, Russia, Australia and the United States. Two of its species can be found on the northwestern coast of Gotland, where it is one of the most common fossil genera. It was described by Gustaf Lindström in the year 1896. The genus contains two species.

Description

Members of the Holophraga genus are small shoe or horn-shaped corals. They usually lived on their side, with their calyx pointing upwards. H.calceoloides has a distinct cardinal septa, while H.mitrata does not.

Species