Middle Cenomanian ammonites from the type section of the Sanandinovo Formation of northern Bulgaria

W. J. Kennedy, and N. Jolkicev

2004

Article

Acta Geologica Polonica 54:369-380

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Taxa discussed in this work:

• Acanthoceras newboldi
• Calycoceras (Newboldiceras) planecostatum
• Calycoceras (Proeucalycoceras) picteti
• Protacanthoceras tuberculatum

Taxonomy:

• Tetragonites subtimotheanus belongs to Tetragonites - Kennedy and Jolkicev (2004)
• Acanthoceras jukesbrownei belongs to Acanthoceras - Kennedy and Jolkicev (2004)
• Protacanthoceras belongs to Acanthoceratinae - Kennedy and Jolkicev (2004)
• Protacanthoceras tuberculatum belongs to Protacanthoceras - Kennedy and Jolkicev (2004)
• Acanthoceras newboldi belongs to Calycoceras (Newboldiceras) asiaticum - Kennedy and Jolkicev (2004)
• Calycoceras (Newboldiceras) planecostatum belongs to Calycoceras (Newboldiceras) - Kennedy and Jolkicev (2004)