Ancyloceras ammonites have a shell reaching a length of about 10 centimetres (3.9 in) and a width of about 7 centimetres (2.8 in). They are known as heteromorph shaped, with a partly uncoiled shell and the aperture directed toward the coiled part.
Most ammonites are homomorph, as they maintain the same shape throughout the growth, while the ammonites in this genus have uncoiled shells (heteromorph or different-shaped ammonites), that would have precluded fast swimming.[1]
Distributionedit
Fossils of Ancyloceras species are found in the Cretaceous Barremian Stage (117-113 million year old) marine strata of Europe, Colombia and Morocco.
ancyloceras, extinct, genus, heteromorph, ammonites, found, throughout, world, during, lower, cretaceous, from, lower, barremian, epoch, until, genus, extinction, during, lower, aptian, temporal, range, lower, barremian, lower, aptianscientific, classification. Ancyloceras is an extinct genus of heteromorph ammonites found throughout the world during the Lower Cretaceous from the Lower Barremian epoch until the genus extinction during the Lower Aptian 1 2 3 AncylocerasTemporal range Lower Barremian to Lower AptianScientific classificationDomain EukaryotaKingdom AnimaliaPhylum MolluscaClass CephalopodaSubclass AmmonoideaOrder AmmonitidaSuborder AncyloceratinaFamily AncyloceratidaeGenus Ancylocerasd Orbigny 1842SpeciesSee text Contents 1 Selected species 2 Description 3 Distribution 4 References 5 External linksSelected species editAncyloceras audouli Astier 1851 Ancyloceras fallauxi Uhlig 1883 Ancyloceras mantelli Casey 1960 Ancyloceras matheronianum d Orbigny 1842 Ancyloceras vandenheckii Astier 1851 1 Description editAncyloceras ammonites have a shell reaching a length of about 10 centimetres 3 9 in and a width of about 7 centimetres 2 8 in They are known as heteromorph shaped with a partly uncoiled shell and the aperture directed toward the coiled part Most ammonites are homomorph as they maintain the same shape throughout the growth while the ammonites in this genus have uncoiled shells heteromorph or different shaped ammonites that would have precluded fast swimming 1 Distribution editFossils of Ancyloceras species are found in the Cretaceous Barremian Stage 117 113 million year old marine strata of Europe Colombia and Morocco References edit a b c Ancyloceras Paleobiology Database Sepkoski Jack Sepkoski s Online Genus Database Cephalopoda Fossil MuseumExternal links editClark David L November 1958 Anisoceras and Ancyloceras from the Texas Cretaceous Journal of Paleontology 32 6 1076 1081 JSTOR 1300773 nbsp This Ammonitida related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Ancyloceras amp oldid 1165183483, wikipedia, wiki, book, books, library,
