Cadoceras sublaeve, from here.

Belongs within: Stephanocerataceae.

The Cadoceratinae are a group of ammonites known from the Callovian (Middle Jurassic), members of which have a funnel-shaped, more or less open umbilicus and a relatively broad cross-section (Poulton 1987).

    |--Stenocadoceras Imlay 1953 P87
    |--Eocephalites H79
    |--Pseudocadoceras Buckman 1918 [=Novocadoceras Sasonov 1965] P87
    |    `--*P. boreale P87
    |--Paracadoceras Crickmay 1930 P87
    |    `--P. harveyi P87
    |--Cranocephalites H79
    |    |--C. borealis P87
    |    |--C. costidensus P87
    |    |--C. pompeckji P87
    |    `--C. vulgaris P87
    `--Cadoceras Fischer 1882 (see below for synonymy) P87
         |--*C. sublaeve P87
         |--C. anabarense P87
         |--C. apertum P87
         |--C. arcticum Frebold 1964 P87
         |--C. barnstoni (Meek 1859) (see below for synonymy) P87
         |--C. bodylevskyi Frebold 1964 P87
         |--C. calyx P87
         |--C. catostoma P87
         |--C. declinatum P87
         |--C. densicostatum P87
         |--C. elatmae (Nikitin 1881) P87
         |--C. emilianzevi P87
         |--C. excelsus P87
         |--C. falsum Voronetz 1962 [=C. (*Bryocadoceras) falsum] P87
         |--C. glabrum P87
         |--C. lenaense P87
         |--C. nordenskjoldi P87
         |--C. perraraum Voronetz 1962 P87
         |--C. septentrionale Frebold 1964 [incl. C. s. var. latidorsata] P87
         |--C. simulans P87
         |--C. subcatostoma P87
         |--C. subtenuicostatum Voronetz 1962 [=C. (*Streptocadoceras) subtenuicostatum] P87
         |--C. tschernyschevi P87
         |--C. variabile Spath 1932 P87
         `--C. voronetsae Frebold 1964 P87

Cadoceras Fischer 1882 [incl. Bryocadoceras Meledina 1977, Catacadoceras Bodylevsky 1960, Streptocadoceras Meledina 1977] P87

Cadoceras barnstoni (Meek 1859) [=Ammonites barnstoni; incl. C. barnstoni var. arcuata, C. (*Catacadoceras) laptievi Bodylevsky 1960, C. subcalyx Voronetz 1962, C. subcatostoma Voronetz 1962, C. ventroplanum Voronetz 1962] P87

*Type species of generic name indicated


[H79] Hölder, H. 1979. Jurassic. In: Robison, R. A., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt A. Introduction. Fossilisation (Taphonomy), Biogeography and Biostratigraphy pp. A390–A417. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[P87] Poulton, T. P. 1987. Zonation and correlation of Middle Boreal Bathonian to Lower Callovian (Jurassic) ammonites, Salmon Cache Canyon, Porcupine River, northern Yukon. Geological Survey of Canada—Bulletin 358: 1–155.

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