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: † Prolecanitida
SubOrdo: †Prolecanitina
Superfamilia: † Medlicottiaceae
Familia: † Medlicottiidae
Subfamilia: Medlicottiinae
Genera: Artinskia – Eumedlicottia – Medlicottia – Neogeoceras – Paramedlicottia – Syrdenites
Name
Medlicottiinae Karpinsky, 1889
References
The Paleobiology Database Accessed on 12/04/08
The Medlicottiinae is a subfamily of the Medlicottiidae, a family of ammonoid cephalopods included in the Prolecanitida, characterized by having discoidal to thinly lenticular shells with a retuse (grooved) venter and sutures with bifid auxiliary lobes.
The Medlicottiinae classically included, by general consensus,[1] the following five genera: Artinskia, Eumedlicottia, Medlicottia, Neogeoceras, and Syrdenites. Of these only Artinskia and Medlicottia, included in the Medlicottinae in the Treatise (Miller, Furnish, and Schindewolf, 1957) remain in Medlicottinae at present. Episageceras, Propinacoceras, and Sicanites, then included, have become type genera respectively for the Episageceratinae, Propinacoceratinae, and Sicanitinae.
Artinskia is the ancestral form, thought to be derived from Uddenoceras (Uddenitinae), which gave rise to the type genus Medlicottiia. Medilicottia then gave rise to Eumedlicottia and Neogeoceras.[2] The derivation of Syrdenites is uncertain.
References
Medlicottiinae -Paleobio
Saunders et al, 1999. Evolution of Complexity in Paleozoic Ammonoid Sutures. Supplementary Material. [1].
Miller, Furnish, and Schindewolf, 1957. Paleozoic Ammonoidea (Prolecanitina); Treatise on Invertebrate Paleontology, Part L,(Ammonoidea). Geol Soc of America and Univ Kansas Press.
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