Medlicottiinae
Temporal range: U Penn - L Perm
Artinskia, an Artinskian medlicottiine
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Prolecanitida
Family: †Medlicottiidae
Subfamily: †Medlicottiinae
Karpinsky, 1889
Genera

See text

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

  1. ↑ Medlicottiinae -Paleobio
  2. ↑ Saunders et al, 1999. Evolution of Complexity in Paleozoic Ammonoid Sutures. Supplementary Material. .
  • 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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