词条 | Bellerophon (genus) |
释义 |
| name = Bellerophon | image = Bellerophon umbilicalis.jpg | image_caption = Bellerophon sp.{{citation needed|date=March 2011}} | fossil_range= {{fossil range|Silurian|Early Triassic}} | regnum = Animalia | phylum = Mollusca | classis = Gastropoda or Monoplacophora | ordo = | superfamilia = Bellerophontoidea | familia = Bellerophontidae | subfamilia = Bellerophontinae | genus = Bellerophon | genus_authority = Montfort, 1808 |synonyms= Carinaropsis (Bellerophon) (alternative spelling) }} Bellerophon is a genus of extinct paleozoic marine molluscs of uncertain position (Gastropoda or Monoplacophora) in the family Bellerophontidae. The genus was named after Bellerophon, the ancient Greek hero. Bellerophon is the type genus of the family Bellerophontidae.[1]Shell descriptionThe genus is characterised by a shell which is globose, convolute, and planispiral (symmetrically coiled). The shell of Bellerophon superficially resembles that of a miniature cephalopod (e.g. Nautilus or an ammonite), except that septa are lacking. The shell of Bellerophon is often a couple of centimeters in maximum dimension. The external surface is smooth, ornamented only by growth lines. There is a low crest or ridge running along the midline of the shell. Many specimens of Bellerophon show something resembling a "waterline" about halfway up the shell, suggesting that a large amount of the mantle and foot were exposed and covered the outside of the shell, as in the extant Cypraeidae and Naticidae. Possible life habitsThese animals were probably quick moving (for gastropods), relying on speed to avoid predators and, when this was not possible, withdrawing deeply into the shell.[2] Range of distributionThe genus occurs worldwide, and is known from the Silurian to the Early Triassic periods.[3] Discussion of the taxonomyAlthough usually classified as a primitive gastropod, there is a minority view that the Bellerophontida actually represented a more primitive, untorted type of mollusk, (see Torsion) which evolved a spiral shell independently. Another view is that some Bellerophontids, including Bellerophon, were torted gastropods, but that others were untorted forms.[4] SpeciesSpecies within the genus Bellerophon include: subgenus Bellerophon
subgenus ?
References1. ^{{Bouchet 2005}} 2. ^Linsley R. M. 1978. Locomotion rates and shell form in the gastropoda. Malacologia 17, 193-206, page 201. 3. ^Knight J. B., Cox L. R., Keen A. M., Batten R. L., Yochelson E. L. & Robertson R. 1960. Systematic descriptions Archaeogastropoda. In: Moore R. C. (ed.) Treatise on Invertebrate Paleontology. Part I. Mollusca 1, Geological Society of America and Kansas University Press, Colorado and Kansas. 4. ^Wagner P. J. 2001. Gastropod phylogenetics: progress, problems and implications. Journal of Paleontology 75: 1128 - 1140. page 1130. 5. ^1 Gordon, Mackenzie, Jr. & Yochelson, Ellis L. 1987. [https://pubs.er.usgs.gov/usgspubs/pp/pp1368 Late Mississippian gastropods of the Chainman Shale, west-central Utah]. 112 pp.
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16 : Bellerophontidae|Silurian molluscs|Devonian molluscs|Carboniferous molluscs|Permian molluscs|Triassic molluscs|Early Triassic extinctions|Silurian first appearances|Late Devonian animals|Devonian animals of North America|Jeffersonville Limestone|Paleozoic life of Ontario|Paleozoic life of Alberta|Paleozoic life of Manitoba|Paleozoic life of the Northwest Territories|Paleozoic life of Quebec |
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