| 词条 | Platyceras |
| 释义 |
| fossil_range = Silurian-Middle Triassic ~{{fossil range|439|221}} | image = PlatycerasLoganOhio.jpg | image_caption = Platyceras pulcherrimum from the Logan Formation (Mississippian) of Wooster, Ohio) | regnum = Animalia | phylum = Mollusca | classis = Gastropoda | unranked_superfamilia = clade Neritimorpha | superfamilia = Platyceratoidea | familia = Platyceratidae | genus = Platyceras | genus_authority = Conrad, 1840 | synonyms=
| subdivision_ranks = Species | subdivision = | type_species = }} Platyceras is a genus of extinct Paleozoic sea snails, marine gastropod mollusks in the family Platyceratidae. This genus is known from the Silurian to the Middle Triassic periods and especially abundant in the Devonian and Carboniferous.[1] It is the type genus of the family Platyceratidae. DescriptionPlatyceras has a distinctive, curved conical shape that is easily recognized. The cap-like shell is high and broad anteriorly. The posterior portion of the shell, at the apex, is usually slightly coiled in an asymmetrical fashion. Frequently, the front portions of the shells are broken, though the posterior sections are relatively well preserved. Platyceras is particularly abundant in Devonian deposits (359 million to 416 million years old).[1] Platyceras and other platyceratid gastropods are known for the complex symbiotic relationships they had with crinoids.[2]DistributionFossils of Platyceras have been found all over the world,[1] among others in the Floresta Formation of Boyacá, Colombia.[3] References{{portal|Paleontology|Paleozoic}}1. ^1 2 Paleobiology Database. Platyceras at Fossilworks.org 2. ^Baumiller T. K. (2003). "Evaluating the interaction between platyceratid gastropods and crinoids; a cost-benefit approach". Palaeogeography, Palaeoclimatology, Palaeoecology 201(3-4): 199-209. {{doi|10.1016/S0031-0182(03)00625-4}}. 3. ^Mojica & Villarroel, 1984, pp.65-69
Bibliography
16 : Platyceratidae|Silurian first appearances|Triassic extinctions|Prehistoric molluscs of North America|Devonian animals of South America|Devonian Colombia|Fossils of Colombia|Fossil taxa described in 1840|Paleozoic life of Ontario|Floresta Formation|Paleozoic life of Manitoba|Paleozoic life of New Brunswick|Paleozoic life of the Northwest Territories|Paleozoic life of Nova Scotia|Paleozoic life of Nunavut|Paleozoic life of Quebec |
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