Peritrochia, from here.

Belongs within: Gastriocerataceae.

The Marathonitidae are a group of more or less globular ammonoids known from the Upper Carboniferous to the Upper Permian (Miller et al. 1957).

| |--Leeites leei (Glenister & Furnish 1987)HK93
| `--HyattocerasHK93
| |--H. cumminsiG31
| `--H. subgeinitzi Haniel 1915HK93
|--Marathonites smithiP68
|--Pseudovidrioceras pygmaeum (Gemmellaro 1887)HK93
| |--A. dunbariRR79
| `--A. invariabilisKK12 [=Marathonites (Almites) invariabilisWK81]
|--P. erebus Girty 1908P68
|--P. novomexicana Miller & Parizek 1948P68
`--P. sellardsiP68

*Type species of generic name indicated


[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.

[KK12] Korn, D., & C. Klug. 2012. Palaeozoic ammonoids—diversity and development of conch morphology. In: Talent, J. A. (ed.) Earth and Life: Global biodiversity, extinction intervals and biogeographic perturbations through time pp. 491–534. Springer.

[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).

[WK81] Wiedmann, J., & J. Kullmann. 1981. Ammonoid sutures in ontogeny and phylogeny. 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. 215–255. Academic Press.

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