Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Cephalopoda
Subclassis: † Ammonoidea
Ordo: † Ammonitida
Subordo: † Ancyloceratina
Superfamilia: † Turrilitoidea
Familiae: Anisoceratidae – Baculitidae – Diplomoceratidae – Hamitidae – Nostoceratidae – Turrilitidae
Name
† Turrilitoidea Gill, 1871, (as Turrilitidae)
Synonyms
Turrilitaceae (alternative spelling)
Diplomocerataceae Spath, 1926
References
Primary references
Gill, T. 1871. Arrangement of the families of Mollusks. Smithsonian Miscellaneous Collections 10 (227): i–xvi, 1–49. BHL Reference page. : 3
Links
Turrilitoidea – Taxon details on Fossilworks.
Turrilitoidea is a diverse superfamily of Cretaceous ammonites generally considered as heteromorphic and commonly included in the suborder Ancyloceratina. Shells of this diverse group do not coil planospirally, as typical for most ammonites, but rather take on a variety of unique forms. Separation of Turrilitoidea along with Ptychoceratoidea and Scaphatoidea into a different suborder, Turrilitina, was proposed by Beznosov and Mikhailova in 1983 however this view is not accepted by most authors.
Some, such as the eponymous Turrilites, coiled helically, like an auger shell, while others, such as Hamites, had shells with long straight sections, while the one-of-a-kind Nipponites coiled in a way so as to appear as a ball of knots.
As with other ammonites, the last of the Turrilitoidea had perished by the end of the Cretaceous during the Cretaceous–Paleogene extinction event.
References
Arkell et al., 1957. Mesozoic Ammonoidea,in Treatise on Invertebrate Paleontology, Part L (Ammonoidea).
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