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Polysacos
''Polysacos'' is an extinct genus of multiplacophorans (chitons) known from articulated Carboniferous fossils; its seventeen shell plates are arranged in three rows, with seven iterated units. It demonstrates that multiplacophora are related to modern polyplacophora. It was fringed with a ring of hollow spines resembling those of the Ordovician ''Echinochiton''. References Prehistoric chiton genera {{paleo-mollusc-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Multiplacophora
Multiplacophora is a stem-group of chitons with a number of plates arranged in 7 rows along the body. They date to at least the Upper Cambrian, but two lower Cambrian fossils- ''Ocruranus'' and ''Trachyplax'' - may extend the range downwards. Families and genera * Family Hercolepadidae Dzik, 1986 ** Genus ''Hercolepas'' Aurivillius, 1892 ** Genus ''Protobalanus (chiton), Protobalanus'' Hall and Clarke, 1888 * Family Strobilepidae Hoare and Mapes, 1995 ** Genus ''Aenigmatectus'' Hoare and Mapes, 1996 ** Genus ''Deltaplax'' Puchalski, Johnson, Kauffman and Eernisse, 2009 ** Genus ''Diadeloplax'' Hoare and Mapes, 1995 ** Genus ''Hannestheronia'' Vinther, Jell, Kampouris, Carney, Racicot & Briggs, 2012 ** Genus ''Polysacos'' Vendrasco, Wood and Runnegar, 2004 ** Genus ''Strobilepis'' Clarke ''in'' Hall and Clarke, 1888 References {{Taxonbar, from=Q15076861 Devonian animals Late Devonian animals Chitons ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carboniferous
The Carboniferous ( ) is a geologic period and system of the Paleozoic that spans 60 million years from the end of the Devonian Period million years ago ( Mya), to the beginning of the Permian Period, million years ago. The name ''Carboniferous'' means "coal-bearing", from the Latin '' carbō'' ("coal") and '' ferō'' ("bear, carry"), and refers to the many coal beds formed globally during that time. The first of the modern 'system' names, it was coined by geologists William Conybeare and William Phillips in 1822, based on a study of the British rock succession. The Carboniferous is often treated in North America as two geological periods, the earlier Mississippian and the later Pennsylvanian. Terrestrial animal life was well established by the Carboniferous Period. Tetrapods (four limbed vertebrates), which had originated from lobe-finned fish during the preceding Devonian, became pentadactylous in and diversified during the Carboniferous, including early amphibian line ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinochiton
''Echinochiton'' is an extinct genus of Ordovician chiton Chitons () are marine molluscs of varying size in the class Polyplacophora (), formerly known as Amphineura. About 940 extant and 430 fossil species are recognized. They are also sometimes known as gumboots or sea cradles or coat-of-mail s ...s with hollow spines on its margins; these spines, which are unique among the chitons, have a strong organic component and show growth lines. References Prehistoric chiton genera Ordovician molluscs Monotypic mollusc genera Fossils of the United States {{Paleo-mollusc-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
