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Importing Wikidata short description: Genus of molluscs (fossil) (shortdescs-in-category) |
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{{Short description|Genus of molluscs (fossil)}}
{{Automatic taxobox
| fossil_range = {{fossil range|Toarcian|Bajocian|ref=<ref name="Sepkoski Ceph">{{cite
| image =
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| subdivision_ranks = Species
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| familia = [[Lytoceratidae]]▼
▲| genus_authority = Buckman, 1905
▲| subdivision_ranks = Species <ref name="fossilworks">{{cite web | title= Paleobiology Database - Megalytoceras |authorlink =| coauthors = | year = | url = http://fossilworks.org/bridge.pl?a=taxonInfo&taxon_no=15169 | accessdate = 2014-05-28 }}</ref>
| subdivision =
* ''M. amplum''
* ''M. rasile''
* ''M. rubescens''
}}
'''''Megalytoceras''''' is an extinct genus of [[ammonite]]
The shell of ''Megalytoceras'' is evolute and grew to be fairly large, to as much as 24.5 cm. (8 3/4 in.) in diameter in ''M. amplum'', from the Aalenian of France. Early whorls are elliptical in section and bear periodic flares. Later, or outer, whorls are smooth with convergent sides. The outer rim, or venter, is rounded. Embracement of previous whorls by the next is slight to mild. The umbilicus is rather wide, with an abrupt edge.
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* {{cite book| first1=W.J. |last1=Arkell |first2=B. |last2=Kummel |first3=C.W. |last3=Wright |series=Treatise on Invertebrate Paleontology, Part L, Mollusca 4| title=Mesozoic Ammonoidea | publisher=Geological Society of America and University of Kansas Press |location=Lawrence, Kansas|year=1957}}
{{Taxonbar|from=Q6808588}}
[[Category:Jurassic ammonites]]
[[Category:Fossils of France]]▼
[[Category:Toarcian first appearances]]
[[Category:Middle Jurassic extinctions]]
{{ammonite-stub}}
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