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Hardmanoceras is a tarphycerid genus belonging to the Trocholitidae 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.
| Hardmanoceras Temporal range: uL Ordovician | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | †Tarphycerida |
| Family: | †Trocholitidae |
| Genus: | †Hardmanoceras Teichert & Glenister, 1952 |
Harmanoceras was named by Teichert and Glenister in 1952. The type us Hardmanoceras lobatum.
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