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Halloceras
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Halloceras : ウィキペディア英語版
Halloceras


''Halloceras'' is a gyroconic rotoceratid from the Lower Devonian of North America, with a subtriangular whorl section, narrow dorsum (on the inner side), divergent flanks, and broad, rounded venter (on the outer side), frills at various growth points, suture with shallow ventral and lateral lobes, and a small siphuncle near the venter.
''Halloceras'' was named by Hyatt in 1884. The type us ''Halloceras undulatum''.
==References==

*Bernhard Kümmel, 1964 Nautiloidea-Nautilida. Treatise on Invertebrate Paleontology, Part K, Mollusca 3. Teichert and Moore, eds. Geol Soc of America and Univ Kansas Press.


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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