A reconstruction of a heteromorph ammonite, Hamites sp.
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
†Ammonoidea
Order:
†Ammonitida
Suborder:
†Ancyloceratina Wiedmann [de], 1966
Superfamilies
Ancyloceratoidea
Douvilleiceratoidea
Turrilitoidea
Deshayesitoidea
Scaphitoidea
The Ancyloceratina were a diverse suborder of ammonite most closely related to the ammonites of order Lytoceratina. They evolved during the Late Jurassic but were not very common until the Cretaceous period, when they rapidly diversified and became one of the most distinctive components of Cretaceous marine faunas. They have been recorded from every continent and many are used as zonal or index fossils. The most distinctive feature of the majority of the Ancyloceratina is the tendency for most of them to have shells that are not regular spirals like most other ammonites. These irregularly-coiled ammonites are called heteromorph ammonites, in contrast to regularly coiled ammonites, which are called homomorph ammonites.
The Ancyloceratina were a diverse suborder of ammonite most closely related to the ammonites of order Lytoceratina. They evolved during the Late Jurassic...
Ammonitida is divided into four suborders, the Phylloceratina, Lytoceratina, Ancyloceratina, and Ammonitina. The Phylloceratina is the ancestral stock, derived...
and Ancyloceratina all appearing during the Jurassic. Heteromorph ammonites (ammonites with open or non-spiral coiling) of the order Ancyloceratina became...
Psiloceratina, Ammonitina, Lytoceratina, Haploceratina, Perisphinctina and Ancyloceratina all appearing during the Jurassic. Ammonite faunas during the Jurassic...
cephalopods belonging to the family of heteromorph ammonites (suborder Ancyloceratina). There is a possible fossil record of them being the last ammonites...
mostly during the Late Cretaceous, and often included in the suborder Ancyloceratina. Baculitid genera are characterized by a small to minute initial coil...
Upper Cretaceous (Cenomanian and Turonian); generally included in the Ancyloceratina. Previously (Arkell, 1957) it was included in the ammonoid suborder...
Anisoceratidae is an extinct family of heteromorph ammonites which belong to the Ancyloceratina superfamily Turrilitoidea. Members of the family range is from the lower...
Mascarelli (E.), Meister (C.) & Menkveld-Gfeller (U.), 2012 - Ammonites (Ancyloceratina, Turrilitina) nouvelles ou peu connues de l'Hauterivien supérieur. Annales...
Mascarelli (E.), Meister (C.) & Menkveld-Gfeller (U.), 2012 - Ammonites (Ancyloceratina, Turrilitina) nouvelles ou peu connues de l'Hauterivien supérieur. Annales...
Nostoceras and the Nostoceratidae, are commonly included in the suborder Ancyloceratina but may instead belong in the Turrilitina, a proposed order of heteromorphs...
accepted as being within the separate suborder from the Ammonitida, the Ancyloceratina established by Wiedmann in 1966. There are two main competing theories...
Ancyloceratidae is the type family for the Ancyloceratoidea and of the suborder Ancyloceratina. They are found in Lower Cretaceous, Barremian to perhaps Lower Albian...
indicative of closer phylogenetic relationships between Perisphinctina and Ancyloceratina than with Lytoceratina or Phylloceratina, is published by Nishino et...
Mascarelli (E.), Meister (C.) & Menkveld-Gfeller (U.), 2012 - Ammonites (Ancyloceratina, Turrilitina) nouvelles ou peu connues de l'Hauterivien supérieur. Annales...
generally considered as heteromorphic and commonly included in the suborder Ancyloceratina. Shells of this diverse group do not coil planospirally, as typical...
seems unlikely even without the Desheyesitidae being removed to the Ancyloceratina. Derivation from the Hoplitidae seems more likely, from something like...
Mascarelli (E.), Meister (C.) & Menkveld-Gfeller (U.), 2012 - Ammonites (Ancyloceratina, Turrilitina) nouvelles ou peu connues de l'Hauterivien supérieur. Annales...
(February 2019). "Description of Two Species of Hoploscaphites (Ammonoidea: Ancyloceratina) from the Upper Cretaceous (Lower Maastrichtian) of the U.S. Western...
the Early Cretaceous, both of which are considered Ammonitina. The Ancyloceratina is a collection of highly evolved Lytoceratina. Treatise on Invertebrate...
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