thumb|Čist rez amonita
Ammonoids su grupa izumrlih morskih mekušaca u potklasi Ammonoidea iz klase Cephalopoda. Ovi mekušci, koji se obično nazivaju amonitima, bliže su povezani sa živim koloidima (tj., hobotnicama, lignjama i sipama) nego sa nautiloidima sa ljuskom kao što je živa vrsta Nautilus. Najraniji amoniti pojavili su se tokom devona, dok su poslednje vrste nestale tokom ili ubrzo nakon izumiranja krede-paleogena.
Reference
Literatura
Walker, Cyril and Ward, David. Fossils. Dorling, Kindersley Limited, London, 2002. A Broad Brush History of the Cephalopoda by Dr. Neale Monks, from The Cephalopod Page. Ammonite maturity, pathology and old age By Dr. Neale Monks, from The Cephalopod Page. Essay about the life span of Ammonites. Cretaceous Fossils Taxonomic Index for Order Ammonoitida Deeply Buried Sediments Tell Story of Sudden Mass Extinction
Spoljašnje veze
Descriptions and pictures of ammonite fossils goniat.org, a palaezoic ammonoid database paleozoic.org: gallery of ammonite photographs photos of ammonites at Lyme Regis, UK TaxonConcept's data on cretaceous ammonites The ammonites of Peacehaven - photos of giant cretaceous ammonites in Southern England tonmo.com: The octopus news magazine online, Cephalopod fossil articles. William R. Wahl * Mosasaur Bite Marks on an Ammonite. Preservation of an Aborted Attack? Mosasaur diet
Категорија:Neocephalopoda