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Protoconites
Conical Ediacaran organism From Wikipedia, the free encyclopedia
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Protoconites is an extinct animal from the late Ediacaran and early Cambrian of China with possible affinities to Cnidaria. Specimens are conical in shape, and range from being straight to curved, and is a monotypic genus, containing only Protoconites minor.
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Discovery
The fossil material of Protoconites was found from the Miaohe area of the Doushantuo Formation, Three Gorges, South China in 1994, and described within the same year.[1]
Description
Protoconites minor is a conical organism, growing up to 50 mm (2.0 in) in length, and are smooth in overall appearance. The base of the cone is squared-off, and ranges from 0.2–0.4 mm (0.0–0.0 in) in width, going up to 1–7 mm (0.0–0.3 in) at the top. Whilst most specimens are preserved fully straight, a lot of specimens are also preserved with a notable curve, ranging from 13 to 25 degrees.[2]
Protoconites has been postured to have affinities with Cnidaria, bearing similarities to Cambrorhytium, a conularid cnidarian from the early Cambrian, although Cambrorhytium is much larger than Protoconites. They also differ by the fact that whilst Cambrorhytium has small tentacle-like structures and annulations, whilst Protoconites does not. This is also the same for other tubular forms like the Cambrian aged Archotuba, the Ediacaran aged Lantianella and Piyuania, which all bear annulations and tentacle-like structures, although the overall similar morphologies shows a possible phylogenetic relationship.[2]
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Distribution
Protoconites has only been found within China, and is known from the Ediacaran aged Doushantuo and Dengying Formations,[1][3] and the Ediacaran-Cambrian aged Yanjiahe Formation.[2]
See also
References
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