Allumettoceratidae Flower, 1946 † accepted as Tripteroceratidae Flower, 1941 † (original description)
Anaspyroceras Shimizu & Obata, 1935 † (original description)
Anaspyroceras cumberlandense Flower, 1946 † (original description)
Anaspyroceras williamsae Flower, 1946 † (original description)
Augustoceras Flower, 1946 † (original description)
Augustoceras shideleri Flower, 1946 † (original description)
Beloitoceras amoenum (S. A. Miller, 1878) † (basis of record)
Beloitoceras bucheri Flower, 1946 † (original description)
Clinoceratidae Flower, 1946 † (original description)
Cyrtoceras amoenum S. A. Miller, 1878 † accepted as Beloitoceras amoenum (S. A. Miller, 1878) † (new combination reference)
Cyrtocerinidae Flower, 1946 † (original description)
Dawsonoceras hammelli (Foerste, 1910) † accepted as Gorbyoceras hammelli (Foerste, 1910) † (new combination reference)
Ecdyceras Flower, 1941 † (basis of record)
Ecdyceras foerstei Flower, 1946 † (original description)
Ecdyceras sinuiferum Flower, 1941 † (basis of record)
Faberoceras Flower, 1946 † (original description)
Faberoceras troedssoni (Teichert, 1930) † accepted as Cyrtogomphoceras troedssoni Teichert, 1930 † (basis of record)
Gomphoceras J. de C. Sowerby, 1839 † (basis of record)
Gorbyoceras Shimizu & Obata, 1935 † (additional source)
Gorbyoceras crossi Flower, 1946 † (original description)
Gorbyoceras curvatum Flower, 1946 † (original description)
Gorbyoceras duncanae Flower, 1946 † (original description)
Gorbyoceras ferum (Billings, 1866) † (basis of record)
Gorbyoceras gorbyi (S. A. Miller, 1894) † (additional source)
Gorbyoceras hammelli (Foerste, 1910) † (basis of record)
Gorbyoceras microlineatum (Foerste, 1928) † (basis of record)
Gorbyoceras parksi (Foerste, 1924) † (basis of record)
Gorbyoceras simile Flower, 1946 † (original description)
Graciloceras Flower, 1946 † (original description)
Graciloceras Flower, 1943 † (additional source)
Graciloceras longidomum Flower, 1943 † (basis of record)
Hammelloceras Shimizu & Obata, 1935 † accepted as Gorbyoceras Shimizu & Obata, 1935 † (source of synonymy)
Hammelloceras hammelli (Foerste, 1910) † accepted as Gorbyoceras hammelli (Foerste, 1910) † (new combination reference)
Manitoulinoceras gyroforme Flower, 1946 † (original description)
Michelinoceras ludlowense (S. A. Miller & C. L. Faber, 1894) † accepted as Ordogeisonoceras amplicameratum (J. Hall, 1847) † (basis of record)
Oncoceras J. Hall, 1847 † (basis of record)
Oncoceras anomalum Flower, 1946 † (original description)
Oncoceras arlandi Flower, 1946 † (original description)
Oncoceras bassleri Flower, 1946 † (original description)
Oncoceras cincinnatiense (S. A. Miller, 1884) † (basis of record)
Oncoceras covingtonense Flower, 1946 † (original description)
Oncoceras delicatulum Flower, 1946 † (original description)
Oncoceras duncanae Flower, 1946 † (original description)
Oncoceras elkhornense Flower, 1946 † (original description)
Oncoceras exile Flower, 1946 † (original description)
Oncoceras faberi (S. A. Miller, 1884) † (basis of record)
Oncoceras foerstei Flower, 1946 † (original description)
Oncoceras fossatum Flower, 1946 † (original description)
Oncoceras madisonense Flower, 1946 † (original description)
Oncoceratidae Hyatt, 1884 † (basis of record)
Orthoceras (Dawsonoceras) hammelli Foerste, 1910 † accepted as Gorbyoceras hammelli (Foerste, 1910) † (new combination reference)
Orthoceras ferum Billings, 1866 † accepted as Gorbyoceras ferum (Billings, 1866) † (new combination reference)
Orthoceras hammelli Foerste, 1910 † accepted as Gorbyoceras hammelli (Foerste, 1910) † (new combination reference)
Probillingsites Foerste, 1928 † (basis of record)
Probillingsites faberi Flower, 1946 † (original description)
Probillingsites lebanonensis Flower, 1946 † (original description)
Probillingsites minutum Flower, 1946 † (original description)
Probillingsites oxfordensis Flower, 1946 † (original description)
Probillingsites welleri Foerste, 1928 † (basis of record)
Proterocameroceratidae Kobayashi, 1937 † (additional source)
Rasmussenoceras Foerste, 1932 † (basis of record)
Rasmussenoceras variabile Flower, 1946 † (original description)
Sactorthoceratidae Flower, 1946 † (original description)
Schuchertoceras A. K. Miller, 1932 † (basis of record)
Schuchertoceras discretum Flower, 1946 † (original description)
Schuchertoceras discretum var. minor Flower, 1946 † (original description)
Schuchertoceras distinctum Flower, 1946 † (original description)
Schuchertoceras geniculatum Flower, 1946 † (original description)
Schuchertoceras obscurum Flower, 1946 † (original description)
Schuchertoceras prolongatum Flower, 1946 † (original description)
Schuchertoceras rotundum Flower, 1946 † (original description)
Shideleroceras Flower & Foerste, 1946 † (original description)
Shideleroceras gracile Flower, 1946 † (original description)
Shideleroceras simplex Flower, 1946 † (original description)
Shideleroceras sinuatum Foerste, 1946 † (original description)
Shideleroceratidae Flower, 1946 † (original description)
Spyroceras ferum (Billings, 1866) † accepted as Gorbyoceras ferum (Billings, 1866) † (new combination reference)
Spyroceras hammelli (Foerste, 1910) † accepted as Gorbyoceras hammelli (Foerste, 1910) † (new combination reference)
Spyroceras microlineatum Foerste, 1928 † accepted as Gorbyoceras microlineatum (Foerste, 1928) † (new combination reference)
Spyroceras parksi Foerste, 1924 † accepted as Gorbyoceras parksi (Foerste, 1924) † (new combination reference)
Strandoceras Flower, 1946 † (original description)
Tripteroceras Hyatt, 1884 † (basis of record)
Valcouroceratidae Flower, 1946 † (original description)
Whitfieldoceras casteri Flower, 1946 † (original description)
Zitteloceras russelli Flower, 1946 † accepted as Laphamoceras russelli (Flower, 1946) † (original description)

Indiana for Gorbyoceras crossi Flower, 1946 † 
Indiana for Gorbyoceras duncanae Flower, 1946 † 
Indiana for Oncoceras duncanae Flower, 1946 † 
Indiana for Oncoceras exile Flower, 1946 † 
Indiana for Oncoceras madisonense Flower, 1946 † 
Indiana for Shideleroceras gracile Flower, 1946 † 
Kentucky for Augustoceras shideleri Flower, 1946 † 
Kentucky for Oncoceras arlandi Flower, 1946 † 
Kentucky for Oncoceras bassleri Flower, 1946 † 
Kentucky for Oncoceras covingtonense Flower, 1946 † 
Kentucky for Oncoceras foerstei Flower, 1946 † 
Kentucky for Oncoceras fossatum Flower, 1946 † 
Kentucky for Probillingsites lebanonensis Flower, 1946 † 
Ohio for Anaspyroceras cumberlandense Flower, 1946 † 
Ohio for Anaspyroceras williamsae Flower, 1946 † 
Ohio for Beloitoceras bucheri Flower, 1946 † 
Ohio for Ecdyceras foerstei Flower, 1946 † 
Ohio for Gorbyoceras curvatum Flower, 1946 † 
Ohio for Gorbyoceras duncanae Flower, 1946 † 
Ohio for Gorbyoceras simile Flower, 1946 † 
Ohio for Manitoulinoceras gyroforme Flower, 1946 † 
Ohio for Oncoceras anomalum Flower, 1946 † 
Ohio for Oncoceras elkhornense Flower, 1946 † 
Ohio for Probillingsites faberi Flower, 1946 † 
Ohio for Probillingsites minutum Flower, 1946 † 
Ohio for Probillingsites oxfordensis Flower, 1946 † 
Ohio for Schuchertoceras distinctum Flower, 1946 † 
Ohio for Schuchertoceras geniculatum Flower, 1946 † 
Ohio for Schuchertoceras obscurum Flower, 1946 † 
Ohio for Schuchertoceras rotundum Flower, 1946 † 
Ohio for Shideleroceras simplex Flower, 1946 † 
Ohio for Shideleroceras sinuatum Foerste, 1946 † 
Ohio for Zitteloceras russelli Flower, 1946 † 

 Etymology note

 for Zittelloceras Hyatt, 1884 †

The genus was explicitly "dedicated to Prof. Karl Zittel of Munich" (Hyatt 1884, p. 284). Thus, "Zittelloceras" is ... [details]