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Temporal range: uL Ordovician
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoaa
Order: Tarphycerida
Family: Trocholitidae
Genus: Hardmanoceras
Teichert & Glenister, 1952

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.


  • 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.