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Trilobozoa ("three-lobed animals") is an extinct phylum of what are presumed to be animals which displayed tri-radial symmetry. Many, if not most, of the better-known trilobozoans lived prior to the Cambrian Explosion, during Ediacaran times. The Ediacaran Period is the last geological period of the Neoproterozoic Era, just before the Cambrian. ...
The Permian is a geologic period that extends from about 299. ...
The conservation status of a species is an indicator of the likelihood of that species continuing to survive either in the present day or the future. ...
Three small ammonite fossils, each approximately 1. ...
For other uses, see Scientific classification (disambiguation). ...
Animalia redirects here. ...
Phylum (plural: phyla) is a taxon used in the scientific classification of life. ...
The Cambrian explosion of species refers to the geologically sudden appearance in the fossil record of the ancestors of familiar animals, starting about 542 million years ago (Mya). ...
The Ediacaran Period is the last geological period of the Neoproterozoic Era, just before the Cambrian. ...
The most primitive trilobozoans were disk-shaped, typified by Tribrachidium. Through comparisons with the other discoidal trilobozoans, the different "arm" patterns on each genus/species occurred due to growth arresting or progressing at different stages of developmental growth. Few fossils of Ediacaran animals are so compellingly bizarre as this unusual disc-shaped form with three-part (triradial) symmetry. ...
The more advanced, and much longer-lasting, trilobozoans were cone-shaped, as typified by the long-lived genus Conularia, and had shell-like structures that resemble angular ice-cream cones which may have had three or four corners. The conularids were once thought to be anthozoan cnidarians when they were first discovered. However, the lack of septa or other features diagnostic of anthozoans, along with their triradial symmetry lead some researchers to place the conularids within Trilobozoa. Conularids are not generally thought to be a part of the Vendian fauna, if only because of their fossil record, which begun a little before the Cambrian period, and ended at the close of the Permian. Anthozoa is a class within the phylum Cnidaria that contains the sea anemones and corals. ...
Classes Anthozoa - Corals and sea anemones Scyphozoa - Jellyfish Staurozoa - Stalked jellyfish Cubozoa - Sea wasps or box jellyfish Polypodiozoa Hydrozoa - Hydroids, hydra-like animals Cnidaria (silent c - pronounced // from New Latin cnida, fr. ...
Anthozoa is a class within the phylum Cnidaria that contains the sea anemones and corals. ...
The Vendian biota (also known as Vendian forms, Vendian fauna(s), and Vendazoa) are a group of ancient lifeforms that are found in rocks a bit older than the Cambrian faunas that represent the oldest fossils of classical paleontology. ...
The Cambrian is a major division of the geologic timescale that begins about 542 ± 1. ...
The Permian is a geologic period that extends from about 299. ...
References - Ivantsov, A. Yu., & M. A. Fedonkin. 2002. Conulariid-like fossil from the Vendian of Russia: A metazoan clade across the Proterozoic/Palaeozoic boundary. Palaeontology 45 (6): 1219-1229.
- McMenamin, Mark A. S. The Garden of Ediacara New York: Columbia University Press, 1998. ISBN 0-231-10559-2
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