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Paractinoceras : ウィキペディア英語版 | Paractinoceras
''Paractinoceras'' is a long straight slender actinocerid ammonite with siphuncular segments in the early stages like those of ''Actinoceras'', becoming narrower in the later stages of the chambered phragmocone like those in ''Ormoceras''. As with ''Kochoceras'' and ''Floweroceras'' ''Paractinoceras'' is considered a separate genus within the Actinoceratidae, distinct from ''Actinoceras''. ==References==
*Flower R.H 1968, The First Great Expansion of the Actinoceroids, New Mexico Bureau of Mines and Mineral Resources Memoir 19 Part I, Socorro NM *
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