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A primary difference between ammonites and nautiloids is the siphuncle of ammonites (excepting Clymeniina) runs along the ventral periphery of the septa and camerae (i.e., the inner surface of the outer axis of the shell), while the siphuncle of nautiloids runs more or less through the center of the septa and camerae.
This list of ammonites is a comprehensive listing of genera that are included in the subclass †Ammonoidea, excluding purely vernacular terms. The list includes genera that are commonly accepted as valid, as well as those that may be invalid or doubtful ( nomina dubia ), or were not formally published ( nomina nuda ), as well as junior ...
Ammonitida or "True ammonites" are an order of ammonoid cephalopods that lived from the Jurassic through Paleocene time periods, commonly with intricate ammonitic sutures. Ammonitida is divided into four suborders, the Phylloceratina , Lytoceratina , Ancyloceratina , and Ammonitina .
Hammatoceras is a genus of ammonites belonging to the family Hammatoceratidae ... Germany, Hungary, Indonesia, Italy, Spain, Tunisia and the United Kingdom ...
This list of fossil sites is a worldwide list of localities known well for the presence of fossils.Some entries in this list are notable for a single, unique find, while others are notable for the large number of fossils found there.
This page was last edited on 2 November 2023, at 00:41 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Ammonites — members of the Ammonoidea subclass of molluscan prehistoric cephalopods. Pages in this category should be moved to subcategories where applicable. This category may require frequent maintenance to avoid becoming too large.
Menuthiocrioceras is an ammonite genus from the Early Cretaceous belonging to the Ancyloceratoidea. Fossils belonging to this genus were found in Madagascar and Indonesia. Fossils belonging to this genus were found in Madagascar and Indonesia.