Hemitrypa

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Hemitrypa
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Bryozoa
Class: Stenolaemata
Order: Fenestrida
Family: Fenestellidae
Genus: Hemitrypa

Hemitrypa is an extinct genus of bryozoans that lived from the Devonian to the Permian period, belonging to the family Fenestellidae. [1] Like some other fenestrate bryozoans, it produced a skeletal superstructure to protect the colony. [2]

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Homotrypa is an extinct genus of bryozoans from the Ordovician and Silurian periods, known from fossils found in the United States. Its colonies are branch-like and have small monticules made of groups of three or four larger zooecia slightly protruding out from the main surface of the colony. In cross section, the zooecia are erect in axis and gently curve toward the surface of the colony.

Eridotrypa is an extinct genus of bryozoans of the family Aisenvergiidae, consistently forming colonies made of thin branches. Diaphragms are very common in colonies. Distinctively, in the exozone there are serrated dark borders separating the autozooecia.

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Arthrostyloecia is an extinct genus of bryozoan of the family Arthrostylidae, that lived in the Ordovician period. Its colonies are articulated, distinctively containing ball and socket joints. It contains a single species, Arthrostyloecia nitida.

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Palaeostomata is a superorder of extinct stenolaemate bryozoans, including all extinct orders within Stenolaemata and excluding the order Cyclostomata, which is the only extant stenolaemate order. Palaeostomates are sometimes called "stony bryozoans" because they are heavily calcified, making them ideal candidates for fossilization. They are distinct from cyclostomes because they lack calcified exterior walls above the basal lamina and because their zooecial tubes are transected by calcitic partitions, such as diaphragms.

References

  1. Andres, Juan Luis Suarez; Ernst, Andrej (2015). "Lower–Middle Devonian Fenestellidae (Bryozoa) of NW Spain: implications for fenestrate palaeobiogeography". Facies. 61.
  2. Ernst, Andrej (2012). "Diversity dynamics and evolutionary patterns of Devonian Bryozoa". Palaeobiodiversity and Palaeoenvironments. 93.