Astiericeras

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{{Automatic taxobox

| fossil_range = {{fossil range|Albian|ref={{cite web

| last = Sepkoski| first = Jack| title= Sepkoski's Online Genus Database|author-link =| year = 2002| url = http://strata.geology.wisc.edu/jack/showgenera.php?taxon=231&rank=class| accessdate = 2014-05-28 }}}}

| taxon = Astiericeras

| authority = Parona & Bonarelli. 1896

}}

Astiericeras is an ammonite from the Lower Cretaceous, the shell of which is evolute, stout; outer whorl with strong, well spaced, transverse ribs that cross smoothly over the broad venter; early whorls with lateral tubercles. The outer, mature whorl separates from the coil but hooks back quickly, referred to as a heteromorph.

Astiericeras is generally considered to be a douvillieceratid.{{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}} However, according to W. J. Kennedy, the genus may instead be a scaphitoid.{{cite journal |last1=Kennedy |first1=W. J. |year=1985 |title=Observations on Astiericeras astierianum (d'Orbigny, 1842) (Cretaceous Ammonoidea) |journal= Geological Magazine |volume=123 |issue=5 |pages=507–513 |doi= 10.1017/S0016756800035093}}

References