MolluscaBase taxon details
Protocycloceras Hyatt, 1900 †
1772006 (urn:lsid:marinespecies.org:taxname:1772006)
accepted
Genus
Orthoceras lamarcki Billings, 1859 † accepted as Protocycloceras lamarcki (Billings, 1859) † (type by original designation)
Palaeocycloceras Shimizu & Obata, 1936 † · unaccepted > junior subjective synonym
Rhabdocycloceras Zhuravleva, 1994 † · unaccepted > junior subjective synonym
- Species Protocycloceras affine Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 †
- Species Protocycloceras anhuiense D.-L. Qi, 1983 †
- Species Protocycloceras compressum D.-L. Qi, 1983 †
- Species Protocycloceras densum C.-G. Lai & G.-H. Xu, 1987 †
- Species Protocycloceras deprati (Reed, 1917) †
- Species Protocycloceras endogastrum G.-H. Xu & C.-G. Lai, 1987 †
- Species Protocycloceras exogastrum D.-L. Qi, 1980 †
- Species Protocycloceras huanghuaense G.-H. Xu & C.-G. Lai, 1987 †
- Species Protocycloceras hupehense (Shimizu & Obata, 1936) †
- Species Protocycloceras lamarcki (Billings, 1859) †
- Species Protocycloceras liratum D.-L. Qi, 1980 †
- Species Protocycloceras minor Kröger & Pohle, 2021 †
- Species Protocycloceras minosiphonatum C.-G. Lai & D.-L. Qi, 1977 †
- Species Protocycloceras minutum G.-H. Xu & C.-G. Lai, 1987 †
- Species Protocycloceras multicameratum D.-L. Qi, 1980 †
- Species Protocycloceras remotum C.-G. Lai, 1960 †
- Species Protocycloceras shensiense (Endo, 1932) †
- Species Protocycloceras sichuanense R.-Z. Wang, 1978 †
- Species Protocycloceras wangi (Yü, 1957) †
- Species Protocycloceras wongi (Yü, 1930) †
- Species Protocycloceras abnorme Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † (uncertain > unassessed)
- Species Protocycloceras arkansasense Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † (uncertain > unassessed)
- Species Protocycloceras doniphonense Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † (uncertain > unassessed)
- Species Protocycloceras geronticum Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † (uncertain > unassessed)
- Species Protocycloceras levisense Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † (uncertain > unassessed)
- Species Protocycloceras manitouense Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † (uncertain > unassessed)
- Species Protocycloceras mendax (Salter, 1859) † (uncertain > unassessed)
- Species Protocycloceras odenvillense Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † (uncertain > unassessed)
- Species Protocycloceras philipsburgense Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † (uncertain > unassessed)
- Species Protocycloceras repens (Billings, 1865) † (uncertain > unassessed)
- Species Protocycloceras rushense (McChesney, 1859) † (uncertain > nomen dubium)
- Species Protocycloceras smithvillense Ulrich, Foerste, A. K. Miller & Unklesbay, 1944 † (uncertain > unassessed)
- Species Protocycloceras xerxes (Billings, 1865) † (uncertain > unassessed)
- Species Protocycloceras deprati Yü, 1930 † accepted as Protocycloceras hupehense (Shimizu & Obata, 1936) † (unaccepted > junior homonym, of Protocycloceras deprati (Reed, 1917), P. hupehense Shimizu & Obata, 1936 is a replacement name)
- Species Protocycloceras laswelli S. C. Hook & Flower, 1977 † accepted as Anrangeroceras laswelli (S. C. Hook & Flower, 1977) † (unaccepted > superseded combination)
- Species Protocycloceras rhabdiferum S. C. Hook & Flower, 1977 † accepted as Anrangeroceras rhabdiferum (S. C. Hook & Flower, 1977) † (unaccepted > superseded combination)
- Species Protocycloceras shansiense (Endo, 1932) † accepted as Protocycloceras shensiense (Endo, 1932) † (unaccepted > misspelling - incorrect subsequent spelling)
- Species Protocycloceras whitfieldi Ruedemann, 1906 † accepted as Protocycloceras lamarcki (Billings, 1859) † (unaccepted > junior subjective synonym)
marine, brackish, fresh, terrestrial
fossil only
neuter
Hyatt, A. (1900). Cephalopoda. In: Zittel, K. A. V.; Eastman, C. R. (Eds). <em>Text-book of paleontology by Karl A. von Zittel [translated from German to English and edited by C. R. Eastman]. Vol. 1.</em> pp. 502-604. Macmillan, London., available online at https://www.biodiversitylibrary.org/page/17392244
page(s): 518 [details]
page(s): 518 [details]
MolluscaBase eds. (2026). MolluscaBase. Protocycloceras Hyatt, 1900 †. Accessed at: https://molluscabase.org/aphia.php?p=taxdetails&id=1772006 on 2026-07-10
Date
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original description
Hyatt, A. (1900). Cephalopoda. In: Zittel, K. A. V.; Eastman, C. R. (Eds). <em>Text-book of paleontology by Karl A. von Zittel [translated from German to English and edited by C. R. Eastman]. Vol. 1.</em> pp. 502-604. Macmillan, London., available online at https://www.biodiversitylibrary.org/page/17392244
page(s): 518 [details]
original description (of Rhabdocycloceras Zhuravleva, 1994 †) Zhuravleva, F. A. (1994). The order Dissidocerida (Cephalopoda). <em>Paleontological Journal.</em> 28(1): 115-133. [details]
original description (of Palaeocycloceras Shimizu & Obata, 1936 †) Shimizu, S.; Obata, T. (1936). On some new genera of Ordovician nautiloids from East Asia. <em>The Journal of the Shanghai Science Institute, Section 2.</em> 2: 11-25.
page(s): 20 [details] Available for editors
[request]
new combination reference Kröger, B.; Pohle, A. (2021). Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen – a pelagic fauna with Laurentian affinities. <em>European Journal of Taxonomy.</em> 783(1): 1-102., available online at https://doi.org/10.5852/ejt.2021.783.1601
page(s): 53 [details]
page(s): 518 [details]
original description (of Rhabdocycloceras Zhuravleva, 1994 †) Zhuravleva, F. A. (1994). The order Dissidocerida (Cephalopoda). <em>Paleontological Journal.</em> 28(1): 115-133. [details]
original description (of Palaeocycloceras Shimizu & Obata, 1936 †) Shimizu, S.; Obata, T. (1936). On some new genera of Ordovician nautiloids from East Asia. <em>The Journal of the Shanghai Science Institute, Section 2.</em> 2: 11-25.
page(s): 20 [details] Available for editors
[request]new combination reference Kröger, B.; Pohle, A. (2021). Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen – a pelagic fauna with Laurentian affinities. <em>European Journal of Taxonomy.</em> 783(1): 1-102., available online at https://doi.org/10.5852/ejt.2021.783.1601
page(s): 53 [details]
