Some genera from Kröger & Landing, 2007, and Kröger, Beresi & Landing, 2007, with some taxonomic tweaking from Shevyrev, 2006
This treatment is a snub.
<==o †Ellesmeroceroida Flower, in Flower & Kummel, 1950 |?- †Amsleroceras Hook & Flower, 1977 |?- †Cyptendoceras Ulrich & Foerste, 1936 |?- †Pachendoceras Ulrich & Foerste, 1936 |?- †Rioceras Flower, 1964 |?- †Robsonoceras Ulrich & Foerste, 1936 |?-o †Apocrinoceratidae | `-- †Apocrinoceras Teichert & Glenister, 1954 |?-o †Baltoceratidae Kobayashi, 1935 emend. Kröger, Beresi & Landing, 2007 ==> Orthoceratida?? | |-- †Bactroceras Holm, 1899 | |--o †Cochlioceras Eichwald, 1860 emend. Kröger, Beresi & Landing, 2007 | | `-- †C. avus Eichwald, 1860 emend. Kröger, Beresi & Landing, 2007 | |-- †Cyrtobaltoceras Flower, 1964 | |--o †Eosomichelinoceras J.-Y. Chen, 1974 | | |-- †E. huananensis J.-Y. Chen, 1974 | | `-- †E. baldisii Kröger, Beresi & Landing, 2007 | |-- †Hedstreomoceras Foerste, 1930 | |-- †Metabaltoceras Flower, 1964 | |-- †Microbaltocers Flower, 1964 | |?- ?†Ogygoceras Ulrich et al., 1944 | |-- †Rangeroceras Hook & Flower, 1977 | |-- †Rhabdiferoceras Flower, 1964 | |-- †Semiannuloceras Evan s, 2005 | |-- †Sinocochlioceras Qi, 1980 | `-- †Veneficoceras Hook & Flower, 1977 |?-o †Eothinoceratidae |?-o †Cyclostomiceratidae |?-o †Shideloceratidae |?-o †Protocycloceratidae | |--o †Protocycloceras | | |-- †P. atavus (Brøgger, 1882) | | |-- †P. zhaoi Zou, 1988 | | `-- †P. gangshanense Zou, 1988 | `-- †Walcottococeras Ulrich & Foerste, 1935 |--o †Ellesmerocerina Flower, 195 [nom. transl. Flower, 1964 ex ordo Ellesmeroceratida Flower, 1950] [Ecdyceratida Flower, 1961] | `--o †Ellesmeroceratidae Kobayashi, 1934 [incl. Oneoceratidae Dzik, 1984] | |--o †Annoceras Flower, 1964 | | |-- †A. costatum Flower, 1964 [Annoceras elevatum Flower, 1964; Annoceras perobliquum Flower, 1964; Annoceras costatum Flower, 1964; Ellesmeroceras fusiforme Flower, 1964; Ellesmeroceras imbricatum Flower, 1964; Ellesmeroceras indomitum Flower, 1964; Ellesmeroceras progessum Flower, 1964; Eremoceras magnum Flower, 1964; Eremoceras? sp. cf. Eremoceras magnum Flower, 1964; Eremoceras perseptatum Flower, 1964; Eremoceras progressum (Flower) Dzik, 1984] | | |-- †A. vernonense (Ulrich et al., 1943) | | `-- †A. multicameratum (Flower, 1964) | |--o †Clarkoceras Ruedemann, 1905 | | |-- †C. newtonwinchelli (Clarke, 1897) [Piloceras newton-winchelli Clarke, 1897] | | `-- †C. ruedemanni Flower, 1964 | |--o †Dakeoceras Ulrich & Foerste, 1931 | | |-- †D. normale Ulrich & Foerste, 1931 | | |-- †D. champlainense Kröger & Landing, 2007 | | |-- †D. harrisi Flower, 1964 [Clarkeoceras? clelandi Ulrich, Foerste & Miller, 1943; Clarkeoceras clelandi Flower, 1964; Dakeoceras harrisi Flower, 1964] | | `-- †D. gracilis (Cleland, 1903) [Cyrtoceras sp. Cleland, 1900; Cyrtoceras gracilis Cleland, 1903; Ectenoceras? gracilis (Cleland) Ulrich, Foerste & Miller, 1943; Ectenoceras gracilis (Cleland) Flower, 1964] | |--o †Ectenolites Ulrich & Foerste, 1935 | | |-- †E. subgracilis Ulrich & Foerste, 1935 | | |-- †E. clelandi Ulrich, Foerste, Miller, Unklesbay, 1944 | | |-- †E. extensus Flower, 1964 | | `-- †E. sinuatus Flower, 1964 | |--o †Ellesmeroceras Foerste, 1921 | | `-- †E. scheii Foerste, 1921 | |--o †Eremoceras Hyatt, 1884 | | |-- †E. syphax (Billings, 1865) [Cyrtoceras syphax Billings, 1865] | | `-- †E. teres Ulrich, Foerste & Miller, 1943 | |--o †Eorudolfoceras Kröger & Landing, 2007 | | |-- †E. antiquum (Flower, 1964) | | `-- †E. praenuntium Flower, 1964 | `-- †Pseudendoceras Chen & Teichert, 1983 `--o †Cyrtocerinina Flower, 1964 [Bathmoceratiformes Starobogatov, 1983] |--o †Bathmoceratidae `--o †Cyrtocerinidae
Reference(s):
- Kröger, B., Beresi, M. S. & Landing, E., 2007: Early orthoceratoid cephalopods from the Argentine Precordillera (Lower–Middle Ordovician).
–Journal of Paleontology: Vol. 81, #6, pp. 1266-1283 [doi: 0022-3360/07/0081-1266] - Kröger, B. & Landing, E., 2007: The earliest Ordovician cephalopods of eastern Laurentia — Ellesmerocerids of the Tribes Hill Formation, eastern New York.
–Journal of Paleontology: Vol. 81, #5, pp. 841-857 [doi: 0011-3360/07/0081-841] - Shevyrev, A. A., 2006: The Cephalopod macrosystem: A Historical review, the present state of knowledge, and unsolved problems: 2. classification of nautiloid cephalopods.
–Paleontological Journal: Vol. 40, #1, pp. 43-52