Medlicottioidea

Belongs within: Agoniatitina.
Contains: Medlicottiidae.

The Medlicottioidea were a group of ammonoids that originated in the Lower Carboniferous and survived to the end of the Permian, with a single genus Episageceras crossing the Permian-Triassic boundary (McGowan & Smith 2007). The medlicottioids are characterised by the development of bidentition in the sutural lobes (Korn 2003). The trifid ventral lobe is narrower in members of the family Medlicottiidae than in the Pronoritidae.

Medlicottioidea [Medlicottiaceae]
    |--+--MedlicottiidaeK81
    |  `--SundaitesRR79 [SundaitidaeK81]
    |       `--S. levisRR79
    `--PronoritidaeK81
         |  i. s.: PronoritesP68
         |           |--P. baconiP68
         |           |--P. cyclolobus (Phillips 1836)HK93 [=Goniatites cyclolobusH84]
         |           |    |--P. c. cyclolobusP68
         |           |    `--P. c. arkansiensis Smith 1896P68
         |           |--P. mixolobusH84
         |           |--P. ouraliensisG31
         |           |--P. postcarbonariusG31
         |           `--P. praepermicusG31
         |         MetapronoritesRR79
         |         SakmaritesRR79
         |         ShikhanitesRR79 [ShikhanitidaeHK93]
         `--NeopronoritinaeZL04
              |--Neopronorites Ruzhencev 1936 [incl. Epipronorites Maximowa 1938]ZL04
              |    |--*N. permicus (Tchernow 1907) [=Parapronorites permicus]ZL04
              |    `--N. darvasicus Leonova 1988ZL04
              `--Parapronorites Gemmellaro 1887ZL04
                   |--*P. konincki Gemmellaro 1887ZL04
                   |--P. boesei Smith 1929P68
                   |--P. rectus Leonova 1989ZL04
                   `--P. timorensis Haniel 1915ZL04

*Type species of generic name indicated

References

[G31] Grabau, A. W. 1931. The Permian of Mongolia: A report on the Permian fauna of the Jisu Honguer limestone of Mongolia and its relations to the Permian of other parts of the world. American Museum of Natural History: New York.

[HK93] Hewitt, R. A., J. Kullmann, M. R. House, B. F. Glenister & Wang Y.-G. 1993. Mollusca: Cephalopoda (pre-Jurassic Ammonoidea). In: Benton, M. J. (ed.) The Fossil Record 2 pp. 189–211. Chapman & Hall: London.

[H84] Hyatt, A. 1883–1884. Genera of fossil cephalopods. Boston Soc. Nat. History, Proc. 22: 253–338.

Korn, D. 2003. Typostrophism in Palaeozoic ammonoids? Paläontologische Zeitschrift 77 (2): 445–470.

[K81] Kullmann, J. 1981. Carboniferous goniatites. In: House, M. R., & J. R. Senior (eds) The Ammonoidea: The evolution, classification, mode of life and geological usefulness of a major fossil group pp. 37–48. Academic Press.

McGowan, A. J., & A. B. Smith. 2007. Ammonoids across the Permian/Triassic boundary: a cladistic perspective. Palaeontology 50 (3): 573–590.

[P68] Purnell, L. R. 1968. Catalog of the type specimens of invertebrate fossils. Part I: Paleozoic Cephalopoda. United States National Museum Bulletin 262: 1–198.

[RR79] Ross, C. A., & J. R. P. Ross. 1979. Permian. In: Robison, R. A., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt A. Introduction. Fossilisation (Taphonomy), Biogeography and Biostratigraphy pp. A291–A350. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[ZL04] Zhou, Z., & M. Liengjarern. 2004. Lower Permian perrinitid ammonoid faunas from Thailand. Journal of Paleontology 78: 317–339.