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Bryozoa are a phylum of aquatic invertebrate animals, nearly all forming sedentary colonies. Typically about 0.5 millimetres long, they are filter feeders that sieve food particles out of the water using a retractable lophophore, a "crown" of tentacles lined with cilia. Most marine species live in tropical waters, but a few occur in oceanic trenches, and others are found in polar waters. One class lives only in freshwater environments, and a few members of a mostly marine class prefer brackish water. 5869 living species are known. One genus is solitary and the rest are colonial.
The Danian is the oldest age or lowest stage, of the Paleocene epoch or series, of the Paleogene period or system, and of the Cenozoic era or erathem. The beginning of the Danian age is at the Cretaceous–Paleogene extinction event 66 Ma. The age ended 61.6 Ma, being followed by the Selandian age.
The Selandian is in the geologic timescale an age or stage in the Paleocene. It spans the time between 61.6 and59.2 Ma. It is preceded by the Danian and followed by the Thanetian. Sometimes the Paleocene is subdivided in subepochs, in which the Selandian forms the "Middle Paleocene".
Potamornis is a prehistoric bird genus that dated back to the late Maastrichtian age of the late Cretaceous period. Its scrappy remains were found in the Lance Formation at Buck Creek, USA, and additional possible remains were found in the upper Hell Creek Formation of Montana, dated to the Danian age of the Paleogene period, though these may have been reworked. A single species was named and described in 2001: Potamornis skutchi.
Aigialosuchus is a extinct genus of long-snouted crocodylomorph that lived in what is now Sweden during the Campanian stage of the Late Cretaceous period. The name Aigialosuchus comes from the Greek αἰγιαλός (aigialos), meaning "seashore", and σοῦχος (souchus), meaning "crocodile". The genus contains a single species, A. villandensis, described in 1959 by Per Ove Persson based on material recovered from the Kristianstad Basin in southern Sweden.
Alan H. Cheetham is a paleobiologist and retired senior scientist and curator of invertebrate paleontology at the Smithsonian Institution's National Museum of Natural History.
Cinctipora elegans is a bryozoan species in the genus Cinctipora found in shallow sea-bed around New Zealand. Fossils of the species are also known.
Amphipholis squamata, common names brooding snake star and dwarf brittle star, is a species complex of brittle stars in the family Amphiuridae.
Stevns Klint is a white chalk cliff located some 6 km (3.7 mi) southeast of Store Heddinge on the Danish island of Zealand. Stretching 17 km (11 mi) along the coast, it is of geological importance as one of the best exposed Cretaceous-Tertiary (K/T) boundaries in the world. Subject to frequent erosion, the cliff rises to a height of up to 40 m (130 ft). The cliffs are a UNESCO site.
Catenicella are a genus of bryozoans in the family Catenicellidae.
Catenicella elegans is a species of bryozoans in the genus Catenicella. It is found in New Zealand.
Cupuladria elegans is a species of bryozoans in the suborder Flustrina. It is a Holocene species from the Nansha Islands sea area.
Cribella is a genus of bryozoans in the family Bitectiporidae.
Cuneolina is an extinct genus of prehistoric foraminifera in the family Cuneolinidae with species from the Jurassic and Cretaceous.
Clausotrypa is an extinct genus of prehistoric bryozoans in the family Nikiforovellidae. The species C. elegans is from a Wordian (Permian) marine horizon in the Sijiashan Formation of Northeast China.
Coscinium is an extinct genus of prehistoric bryozoans in the family Hexagonellidae. The species C. elegans is from the Paleozoic rocks of the western states and territories.
Comptonia is an extinct genus of prehistoric sea stars in the family Goniasteridae. Species are from the Cretaceous of Canada (Alberta) and France. The type species, C. elegans was recovered from France.
Cystodictya is an extinct genus of prehistoric bryozoans in the extinct family Cystodictyonidae.
Crisia is a genus of bryozoans in the family Crisiidae. Some species are known from the fossil record.
The following are lists of prehistoric animals:
References
- ↑ Untersuchungen über Coscinopleura Marss.(Bryoz. foss.) und verwandte Gattungen. E Voigt, Mitteilungen aus dem Geologischen Staatsinstitut in …, 1956
- ↑ Studies on the Bryozoan Species Coscinopleura Elegans and Coscinpleura Angusta N. sp. from the Senonian and Danian Deposits of Denmark. O Berthelsen, 1948
- Asexual propagation in the cheilostomes Metrarabdotos and Coscinopleura: Effects on genetic variation and larval productivity, p. 73–80. AH Cheetham, Bryozoan Studies 2001, Proceedings of the Twelfth …, 2002
