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abnorme, Protocycloceras abnorme Ulrich & al., 1944 † (FOSSIL)
arkansasense, Protocycloceras arkansasense Ulrich & al., 1944 † (FOSSIL)
becki, Protocycloceras becki (Billings, 1859) † (FOSSIL)
cataline, Ectocycloceras cataline (Billings, 1865) † (FOSSIL)
cato, Ectocycloceras cato (Billings, 1865) † (FOSSIL)
catulus, Protocycloceras catulus (Billings, 1865) † (FOSSIL)
chikunense, Protocycloceras chikunense Kobayashi, 1927 † (FOSSIL)
colon, Catoraphiceras colon (White, 1874) † (FOSSIL)
cushingi, Catoraphiceras cushingi Ulrich & al., 1944 † (FOSSIL)
deprati, Protocycloceras deprati Reed, 1928 † (FOSSIL)
doniphonense, Protocycloceras doniphonense Ulrich & al., 1944 † (FOSSIL)
floweri, Rhabdocycloceras floweri Zhuravleva, 1994 † - syn of: Protocycloceras lamarcki (Billings, 1856) † (FOSSIL)
foerstei, Catoraphiceras foerstei (Butts, 1926) † (FOSSIL)
furtivum, Protocycloceras furtivum (Billings, 1865) † (FOSSIL)
gangshanense, Protocycloceras gangshanense Zou, 1988 † (FOSSIL)
geronticum, Protocycloceras geronticum Ulrich & al., 1944 † (FOSSIL)
gracile, Endocycloceras gracile Flower, 1964 † (FOSSIL)
ibexense, Catoraphiceras ibexense Hook & Flower, 1977 † (FOSSIL)
kottlovskii, Kyminoceras kottlovskii , † - syn of: Rudolfoceras keadyi Hook & Flower, 1977 † (FOSSIL)
kottlowskii, Kyminoceras kottlowskii Hook & Flower, 1977 † (FOSSIL)
krivolukense, Protocycloceras krivolukense Balaschov, 1962 † - syn of: Tofangoceras pauciannulatum Kobayashi, 1928 † (FOSSIL)
lamarcki, Protocycloceras lamarcki (Billings, 1856) † (FOSSIL)
laswelli, Protocycloceras laswelli Hook & Flower, 1977 † (FOSSIL)
legorense, Endocycloceras legorense Ulrich & al., 1944 † (FOSSIL)
levisense, Protocycloceras levisense Ulrich & al., 1944 † (FOSSIL)
lobatum, Catoraphiceras lobatum Ulrich & Foerste, 1936 † (FOSSIL)
manitouense, Protocycloceras manitouense Ulrich & al., 1944 † (FOSSIL)
mendax, Protocycloceras mendax (Salter &, 1859) † (FOSSIL)
odenvillense, Protocycloceras odenvillense Ulrich & al., 1944 † (FOSSIL)
ordinatum, Protocycloceras ordinatum (Billings, 1865) † (FOSSIL)
osagense, Catoraphiceras osagense Ulrich & al., 1944 † (FOSSIL)
pearsonae, Catoraphiceras pearsonae Hook & Flower, 1977 † (FOSSIL)
perannulatum, Endocycloceras perannulatum Ulrich & al., 1944 † (FOSSIL)
philipsburgense, Protocycloceras philipsburgense Ulrich & al., 1944 † (FOSSIL)
repens, Protocycloceras repens Billings, 1856 † - syn of: Anrangeroceras repens (Billings, 1856) † (FOSSIL)
resseri, Catoraphiceras resseri Ulrich & al., 1944 † (FOSSIL)
rushense, Protocycloceras rushense (McChesney, 1859) † (FOSSIL)
sinuatum, Catoraphiceras sinuatum Hook & Flower, 1977 † (FOSSIL)
smithvillense, Protocycloceras smithvillense Ulrich & al., 1944 † (FOSSIL)
sordidum, Catoraphiceras sordidum (Billings, 1859) † (FOSSIL)
staceyae, Catoraphiceras staceyae Hook & Flower, 1977 † (FOSSIL)
subcurvatum, Endocycloceras subcurvatum Ulrich & al., 1944 † (FOSSIL)
whitfieldi, Protocycloceras whitfieldi Ruedemann, 1906 † - syn of: Protocycloceras lamarcki (Billings, 1856) † (FOSSIL)
wilsonae, Endocycloceras wilsonae Ulrich & al., 1944 † (FOSSIL)
xerxes, Protocycloceras xerxes (Billings, 1865) † (FOSSIL)
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