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Romaniceras : ウィキペディア英語版
Romaniceras

''Romaniceras'' is an early Upper Cretaceous ammonite genus, (Cephalopoda, Ammonoidea), removed from the Acanthoceratinae to the Euomphaloceratinae.
The shell is rather evolute, whorl section circular to oval. Differs from ''Acanthoceras'' in having 9 or 11 rows of tubercles, of which the ventrolateral may be clavate {i.e. elongate). Ribs are strong and fairly close spaced.
==References==

* W.J. Arkell, et al. 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology,Part L, Mollusca 4. Geological Society of America and University of Kansas Press.


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