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Hardmanoceras : ウィキペディア英語版 | Hardmanoceras
''Hardmanoceras'' is a Tarphycerid genus belonging to the Trochilidae from the upper Lower Ordovician to possibly the lower Middle Ordovician, found in Western Australia. ''Hardmanoceras'' is like ''Discoceras'' but prominently ribbed and with a depressed whorl section. The body, or living, chamber is long, 1 1/8 volutions long. The ultimate portion is slightly divergent, not an uncommon characteristic of tarphycerids. ''Harmanoceras'' was named by Teichert and Glenister in 1952. The type us ''Hardmanoceras lobatum''. ==References==
*W.M Furnish and Brian H Glenister, 1964. Nautiloidea-Tarphycerida. Treatise on Invertebrate Paleontology, Part K, Mollusca 3. Teichert and Moore, eds. Geol Soc of America and Univ Kansas Press.
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