O. ovatum Young & Bird, 1822 Most well known and type for this genus. While it is common in
Yorkshire, it is rare in other locations. It has several synonyms: •
Ammonites ovatus Young & Bird, 1822 •
Ovaticeras pseudovatum Buckman 1918
O. paltoides Wiedenmayer, 1980 Species with softly falcoid ribs. Shell is disc-shaped and involution is hiding 2/5 of previous whorl. It has been found only in Switzerland. Stratigraphical position is unknown. It might come from hawskerense subzone, but it is certainly from before tenuicostatum zone.
O. (Pacificeras) propinquum Whiteaves, 1884 Subgenus
Pacificeras (Repin, 1970) is now considered to be synonym of
Tiltoniceras, so this species is now named as
Tiltoniceras propinquum.
O. facetum Repin, 1966 Synonym of
Tiltoniceras propinquum.
O. perplexum Fucini, 1929 Synonym of
Neolioceratoides perplexus Fucini, 1929.
O. mite Fucini, 1929 Synonym of
Parahildaites mitis Fucini, 1929. ==References==