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- Ancistroceras abstract "Ancistroceras is one of the two ancestral lituitids from the late Early Ordovician (Arenigian). The other being Holmiceras. The shell is weakly annulate, starts off with 1.5 to 2 contiguous or slightly separated whorls followed by a rapidly expanding orthocone with an apical angle of about 30 deg. Growth lines are sinuous, show a pronounced hyponomic sinus in the coiled juvenile portion at the apex but almost none at the mature aperture of the orthcone. Holmiceras is similar except that its whorls are more loosely coiled and it is known only from the Arenigian whereas Ancistroceras ranges through most of the Middle Ordovician. Ancistroceras may have given rise to Rhynchorthoceras by a loss of the juvenile coiled portion, replacing it with a short semi-tubular cyrtoconic section. Ancistroceras may also have given rise to Lituites by evolving a narrower, less rapidly expanding, orthocone along with greater ornament and a complex aperture.".
- Ancistroceras class Cephalopod.
- Ancistroceras class Nautiloid.
- Ancistroceras family Lituitidae.
- Ancistroceras kingdom Animal.
- Ancistroceras order Tarphycerida.
- Ancistroceras phylum Mollusca.
- Ancistroceras thumbnail Ancistroceras_undulatum_01.jpg?width=300.
- Ancistroceras wikiPageID "26553507".
- Ancistroceras wikiPageLength "1775".
- Ancistroceras wikiPageOutDegree "15".
- Ancistroceras wikiPageRevisionID "690160870".
- Ancistroceras wikiPageWikiLink Animal.
- Ancistroceras wikiPageWikiLink Category:Early_Ordovician_first_appearances.
- Ancistroceras wikiPageWikiLink Category:Middle_Ordovician_extinctions.
- Ancistroceras wikiPageWikiLink Category:Prehistoric_cephalopods.
- Ancistroceras wikiPageWikiLink Cephalopod.
- Ancistroceras wikiPageWikiLink Holmiceras.
- Ancistroceras wikiPageWikiLink Lituites.
- Ancistroceras wikiPageWikiLink Lituitidae.
- Ancistroceras wikiPageWikiLink Mollusca.
- Ancistroceras wikiPageWikiLink Nautiloid.
- Ancistroceras wikiPageWikiLink Ordovician.
- Ancistroceras wikiPageWikiLink Rhynchorthoceras.
- Ancistroceras wikiPageWikiLink Tarphycerida.
- Ancistroceras wikiPageWikiLinkText "Ancistroceras".
- Ancistroceras classis Cephalopod.
- Ancistroceras familia Lituitidae.
- Ancistroceras fossilRange "late L Ord - M Ord.".
- Ancistroceras genus "Ancistroceras".
- Ancistroceras name "Ancistroceras".
- Ancistroceras ordo Tarphycerida.
- Ancistroceras phylum Mollusca.
- Ancistroceras regnum Animal.
- Ancistroceras subclassis Nautiloid.
- Ancistroceras wikiPageUsesTemplate Template:Italic_title.
- Ancistroceras wikiPageUsesTemplate Template:Taxobox.
- Ancistroceras subject Category:Early_Ordovician_first_appearances.
- Ancistroceras subject Category:Middle_Ordovician_extinctions.
- Ancistroceras subject Category:Prehistoric_cephalopods.
- Ancistroceras type Animal.
- Ancistroceras type Eukaryote.
- Ancistroceras type Mollusca.
- Ancistroceras type Species.
- Ancistroceras type Thing.
- Ancistroceras type Q19088.
- Ancistroceras type Q25326.
- Ancistroceras type Q729.
- Ancistroceras comment "Ancistroceras is one of the two ancestral lituitids from the late Early Ordovician (Arenigian). The other being Holmiceras. The shell is weakly annulate, starts off with 1.5 to 2 contiguous or slightly separated whorls followed by a rapidly expanding orthocone with an apical angle of about 30 deg. Growth lines are sinuous, show a pronounced hyponomic sinus in the coiled juvenile portion at the apex but almost none at the mature aperture of the orthcone.".
- Ancistroceras label "Ancistroceras".
- Ancistroceras sameAs Q4753065.
- Ancistroceras sameAs m.0bh9mn5.
- Ancistroceras sameAs Q4753065.
- Ancistroceras wasDerivedFrom Ancistroceras?oldid=690160870.
- Ancistroceras depiction Ancistroceras_undulatum_01.jpg.
- Ancistroceras isPrimaryTopicOf Ancistroceras.
- Ancistroceras name "Ancistroceras".