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- Ammonitina abstract "Ammonitina comprises a diverse suborder of ammonite cephalopods that lived during the Jurassic and Cretaceous periods of the Mesozoic Era. They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific geological time periods. The shells of Ammonitina are typically planospiral; coiled in a plane, symmetrical side to side. Shells vary in form, including those that are evolute, such that all whorls are exposed, and those that are strongly involute with only the outer whorl showing. They may be strongly ribbed, some bearing nodes and spines; others are entirely smooth. Some have broad rounded venters (the outer rim); in others the venter is sharp and keel-like. Sutures are generally ammonitic, with intricately patterned saddle and lobes. However in some derived forms the suture becomes simplified,ceratitic, even goniatitic.The Ammonitina are derived from the Phylloceratina, another ammonitid suborder which has its origin in the Ceratitida of the Triassic. As with the subclass, the closest living relatives of the Ammonitina are the Coleoidea (octopus, squid, and cuttlefish) and not the superficially similar modern Nautilus.Lower Jurassic superfamlies include the Psilocerataceae, Eocerocerataceae, and Hildoceratoidea, which is in part Middle Jurassic. Superfamilies from the Middle and Upper Jurassic include the Stephanoceratacea, Perispinctaceae, and Haploceratoidea; the Perispinctaceae and Haploceratacea continued well into the Cretaceous. Exclusively Cretaceous superfamilies include the Desmoceratacea, Hoplitaceae, and the Acanthoceratoidea.The Eoderocerataceae of the Lower Jurassic gave rise in the middle of the epoch to the Hilderceratidae, which in turn gave rise early in the Middle Jurassic to the Stephanocerataceae, Perispinctaceae, and Haploceratoidea. The Psiloceratacea from the Lower Jurassic stands alone. The Cretaceous Desmocerataceae are derived from the Phylloceratina separately from Jurassic forms and give rise to the Hoplitaceae and to the Acanthoceratoidea.".
- Ammonitina thumbnail Ammonite_Asteroceras.jpg?width=300.
- Ammonitina wikiPageID "13906718".
- Ammonitina wikiPageRevisionID "567414159".
- Ammonitina authority "Hyatt, 1889".
- Ammonitina hasPhotoCollection Ammonitina.
- Ammonitina imageCaption "Asteroceras, a Jurassic ammonite from England".
- Ammonitina subdivision "*Acanthoceratoidea *Desmocerataceae *Endemocerataceae *Eoderocerataceae *Hammatoceratoidea *Haplocerataceae *Hildoceratoidea *Hoplitaceae *Perisphinctaceae *Psilocerataceae *Stephanocerataceae".
- Ammonitina subdivisionRanks Taxonomic_rank.
- Ammonitina taxon "Ammonitina".
- Ammonitina subject Category:Ammonitida.
- Ammonitina subject Category:Fossils.
- Ammonitina type Adult109605289.
- Ammonitina type CausalAgent100007347.
- Ammonitina type Dodo110022908.
- Ammonitina type Fossils.
- Ammonitina type LivingThing100004258.
- Ammonitina type Object100002684.
- Ammonitina type Oldster110376523.
- Ammonitina type Organism100004475.
- Ammonitina type Person100007846.
- Ammonitina type PhysicalEntity100001930.
- Ammonitina type Whole100003553.
- Ammonitina type YagoLegalActor.
- Ammonitina type YagoLegalActorGeo.
- Ammonitina type Mollusk.
- Ammonitina comment "Ammonitina comprises a diverse suborder of ammonite cephalopods that lived during the Jurassic and Cretaceous periods of the Mesozoic Era. They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific geological time periods. The shells of Ammonitina are typically planospiral; coiled in a plane, symmetrical side to side.".
- Ammonitina label "Ammonitina".
- Ammonitina label "Ammonitina".
- Ammonitina label "Ammonitina".
- Ammonitina label "菊石亞目".
- Ammonitina sameAs Ammonitina.
- Ammonitina sameAs Ammonitina.
- Ammonitina sameAs m.04y5h0c.
- Ammonitina sameAs Q3343308.
- Ammonitina sameAs Q3343308.
- Ammonitina sameAs Ammonitina.
- Ammonitina wasDerivedFrom Ammonitina?oldid=567414159.
- Ammonitina depiction Ammonite_Asteroceras.jpg.
- Ammonitina isPrimaryTopicOf Ammonitina.