Dipoloceras

Dipoloceras Temporal range: L Cretaceous (M- U Albian)
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Ammonoidea
Order:	Ammonitida
Suborder:	Ammonitina
Superfamily:	Acanthoceratoidea
Family:	Brancoceratidae
Genus:	Dipoloceras Hyatt, 1900

Dipoloceras is a rather evolute, strongly ribbed and well keeled acanthocerataean ammonite from the Albian stage of the Lower Cretaceous included in the brancoceratid subfamily Mojsisovicziinae. The whorl section is typically inflated or depressed. Ribs are high standing, may be sharp, close to wide spaced. The ventral keel may sit below the level of the ribs.

Dipoloceras is similar to but distinct from Oxytropidoceras in that Oxytropidoceras has a compressed whorl section, high standing keel and lower ribs. Both have more or less typical ammonitic sutures.

References

• Arkell et al, Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L (Ammonoidea). Geol Soc of Amer. and Univ Kans press. 1957
• Ryszard Marcinowski and Jost Wiedmann. The Albian Ammonites of Poland. Palaeontologia Polonica no. 50, 1990
• Description of Dipoloceras [1]

see also illustrations of
Dipoloceras cristatum [2], [3] Archived 2009-09-11 at the Wayback Machine