Annuloceras
Annuloceras ("Ringed Horns") is an extinct genus of ammonite cephalopod. Its fossils are found in Lower Barremian sediments from California. The genus is currently placed in the family Aegocrioceratidae. Annuloceras is a heteromorph ammonite similar in form to other heteroceratids except that the early helix is more loosely wound. Macroscaphites differs in that the early portion is planispiral and tightly wound. Contemporary Shastoceras, found the same strata in California, differs in lacking a coiled juvenile section.
primaryTopic
Annuloceras
Annuloceras ("Ringed Horns") is an extinct genus of ammonite cephalopod. Its fossils are found in Lower Barremian sediments from California. The genus is currently placed in the family Aegocrioceratidae. Annuloceras is a heteromorph ammonite similar in form to other heteroceratids except that the early helix is more loosely wound. Macroscaphites differs in that the early portion is planispiral and tightly wound. Contemporary Shastoceras, found the same strata in California, differs in lacking a coiled juvenile section.
has abstract
Annuloceras ("Ringed Horns") i ...... ing a coiled juvenile section.
@en
Żył w okresie kredy (barrem).
@pl
phylum
thumbnail
Link from a Wikipage to an external page
Wikipage page ID
Wikipage revision ID
742,492,254
genus
genus authority
Murphy et al, 1995
image caption
Annuloceras summersi
subdivision
subdivision ranks
comment
Annuloceras ("Ringed Horns") i ...... ing a coiled juvenile section.
@en
Żył w okresie kredy (barrem).
@pl
label
Annuloceras
@en
Annuloceras
@pl