Phaulactis is an extinct genus of rugose coral that existed during the Ordovician, Silurian and Devonian periods. It can be found in Europe, North America, Asia and Australia. [1] Phaulactis was described by Ryder in 1926. [2]
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| The species Phaulactis angusta | |
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| Genus: | Phaulactis Ryder, 1926 |
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All members of this genus are horn-shaped solitary corals, although the exact shape can vary between species. Phaulactis is most easily identified by its large amount of septa, deep calyx and distinct internal structure with three clear areas with different properties (but these sections are not always present in younger individuals). Another common trait is clear septal ridges. [3]
Corals are marine invertebrates within the class Anthozoa of the phylum Cnidaria. They typically form compact colonies of many identical individual polyps. Coral species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton.
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Holophragma calceoloides is an extinct species of rugose coral known from Silurian layers mainly on, but not limited to, the northwestern coast of Gotland, where it is very common. The species was recognised in 1866 by Gustaf Lindström. It was small and benthic, and always solitary.
Holophragma mitrata is an extinct species of Rugose coral mainly known from the island of Gotland. It is horn shaped and can grow to about 40mm in length. The calyx is relatively deep and the septa runs from its ridge to the floor. The cardinal septa is not very dominant. It was described by Schlotheim in the year 1820 under the name Hippurites mitratus.
Phaulactis cyathophylloides is an extinct species of rugose coral known from the silurian layers of Gotland, and Estonia. It is the type species of the genus Phaulactis and was described by Ryder in 1926. It can grow to relatively large sizes.
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