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
Familia: † Anisoceratidae
Genera: Algerites – Allocrioceras – Anisoceras – Idiohamites – Ndumuiceras – Phlycticrioceras – Protanisoceras – Tarrantites
Name
† Anisoceratidae Hyatt, 1900
Synonyms
Algeritidae Spath, 1925
Phlycticrioceratidae Spath, 1926
References
Primary references
Hyatt A. 1900. Cephalopoda. pp. 502–604. in: Zittel, K.A. von 1896–1900, Textbook of Palaeontology, transl. Eastman, C.R.. London: Macmillan. BHL Reference page. : 587
Links
Anisoceratidae – Taxon details on Fossilworks.
Anisoceratidae is an extinct family of heteromorph ammonites which belong to the Ancyloceratina superfamily Turrilitoidea. Members of the family range is from the lower Albian to the upper Turonian. The family is possibly derived from a member of the Hamitidae.
Morphology
Anisoceratid shells begin as an irregular helical spiral which typically becomes confined to a single plane with growth. This is usually followed by at least a single straight shaft. Ribs and tubercles are common features.
History and classification
Older classifications, since first publication of Part L of the Treatise on Invertebrate Paleontology, include the Anisoceratidae in the suborder Ancyloceratina (within the Turrilitoidea). Subsequent study, e.g. Beznosov & Mikhailova 1983, has suggested that the Turrilitoidea, including the Anisoceratidae, have a different phylogeny from the true Ancyloceratina, resulting in their occasional reassignment to a separate suborder, the Turrilitina, however this classification is not widely followed.
References
Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.
Beznosov & Mikhailova 1983 referenced in A. Mikhailova and E. Yu. Baraboshkin, 2009. The Evolution of the Heteromorph and Monomorph Early Cretaceous Ammonites of the Suborder Ancyloceratina Wiedmann. Paleontological Journal, Vol. 43, No. 5, 2009.
The Paleobiology Database Anisoceratidae entry
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