Romaniceras ornatissimum, from Amédro et al. (2020). Scale bar = 5 cm.

Belongs within: Acanthoceratidae.

The Euomphaloceratinae are an Upper Cretaceous (Upper Cenomanian to Lower Coniacian) lineage of ammonites that usually exhibit constrictions in the early stages or throughout (Wright et al. 1996).

    |--Lotzeites Wiedmann 1960WCH96
    |    `--*L. aberrans (Kossmat 1895) [=Acanthoceras aberrans]WCH96
    |--Paraburroceras Cobban, Hook & Kennedy 1989WCH96
    |    `--*P. minutum Cobban, Hook & Kennedy 1989WCH96
    |--Paramammites Furon 1935WCH96
    |    `--*P. polymorphum (Pervinquière 1907) [=Vascoceras polymorphum]WCH96
    |--Codazziceras Etayo Serna 1979WCH96
    |    `--*C. scheibei (Riedel 1938) [=Lyelliceras scheibei]WCH96
    |--Morrowites Cobban & Hook 1983WCH96
    |    |--*M. wingi (Morrow 1935) [=Mammites wingi]WCH96
    |    `--M. subdepressusWCH96
    |--Pseudaspidoceras Hyatt 1903 [incl. Ampakabites Collignon 1965]WCH96
    |    |--*P. footeanum (Stoliczka 1864) [=Ammonites footeanus]WCH96
    |    |--P. auriculatum (Collignon 1965) [=Kamerunoceras (*Ampakabites) auriculatum]WCH96
    |    |--P. flexuosumVF21
    |    `--P. pseudonodosoidesVF21
    |--Euomphaloceras Spath 1923 [incl. Burroceras Cobban, Hook & Kennedy 1989, Kanabiceras Reeside & Weymouth 1931]WCH96
    |    |--*E. euomphalum (Sharpe 1855) [=Ammonites euomphalus]WCH96
    |    |--*Burroceras’ clydense Cobban, Hook & Kennedy 1989WCH96
    |    `--E. septemseriatum (Cragin 1893) (see below for synonymy)WCH96
    |--Kamerunoceras Reyment 1954 [incl. Polyaspidoceras Matsumoto 1978, Schindewolfites Wiedmann 1960]WCH96
    |    |--*K. eschii (Solger 1904) [=Acanthoceras eschii]WCH96
    |    |--K. ganuzaiHK81
    |    |--K. inaequicostatus (Wiedmann 1960) [=*Schindewolfites inaequicostatus]WCH96
    |    |--*Polyaspidoceras’ shimizui Matsumoto 1978WCH96
    |    `--K. turonienseWCH96
    `--Romaniceras Spath 1923WCH96
         |  i. s.: R. kallesiHK81
         |--R. (Romaniceras) [incl. Kossmatia Yabe 1927 non Uhlig 1907, Proromaniceras Wiedmann 1960]WCH96
         |    `--*R. (R.) deverianum (Orbigny 1841) (see below for synonymy)WCH96
         |--R. (Neomphaloceras Matsumoto & Obata 1982)WCH96
         |    `--R. (*N.) pseudomphalum (Matsumoto 1975) [=Yubariceras pseudomphalum]WCH96
         |--R. (Obiraceras Matsumoto 1975)WCH96
         |    `--R. (*O.) ornatum Matsumoto 1975WCH96
         |--R. (Shuparoceras Matsumoto 1975)WCH96
         |    `--R. (*S.) yagii Matsumoto 1975WCH96
         `--R. (Yubariceras Matsumoto, Saito & Fukada 1957)WCH96
              `--R. (Y.) ornatissimum (Stoliczka 1864) (see below for synonymy)WCH96

Euomphaloceras septemseriatum (Cragin 1893) [=Scaphites septemseriatus; incl. Acanthoceras kanabense Stanton 1894, *Kanabiceras kanabense]WCH96

*Romaniceras (Romaniceras) deverianum (Orbigny 1841) [=Ammonites deverianus; incl. Acanthoceras pseudodeverianum Jimbo 1894, *Kossmatia pseudodeveriana, *Proromaniceras pseudodeverianum]WCH96

Romaniceras (Yubariceras) ornatissimum (Stoliczka 1864) [=Ammonites ornatissimus; incl. *Yubariceras yubarense Matsumoto, Saito & Fukada 1957]WCH96

*Type species of generic name indicated


[HK81] Hancock, J. M., & W. J. Kennedy. 1981. Upper Cretaceous ammonite stratigraphy: some current problems. 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. 531–553. Academic Press.

[VF21] Vullo, R., E. Frey, C. Ifrim, M. A. González González, E. S. Stinnesbeck & W. Stinnesbeck. 2021. Manta-like planktivorous sharks in Late Cretaceous oceans. Science 371: 1253–1256.

[WCH96] Wright, C. W., J. H. Calloman & M. K. Howarth. 1996. Treatise on Invertebrate Paleontology pt L. Mollusca 4, revised vol. 4. Cretaceous Ammonoidea. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

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