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Stearoceras rotundatum

Cephalopoda - Nautilida - Liroceratidae

Taxonomy
Titanoceras rotundatum was named by Miller and Unklesbay (1942). It is not a trace fossil. Its type locality is Penasco Valley, Highway 82, which is in a Kungurian shallow subtidal limestone in the San Andres Formation of New Mexico.

It was recombined as Parapenascoceras rotundatum by Ruzhentsev and Shimanskiy (1954); it was recombined as Stearoceras rotundatum by Miller and Youngquist (1949), Sealey and Lucas (2025).

Synonymy list
YearName and author
1942Titanoceras rotundatum Miller and Unklesbay p. 732 figs. 2, 3A
1949Stearoceras rotundatum Miller and Youngquist
1954Parapenascoceras rotundatum Ruzhentsev and Shimanskiy p. 93
2025Stearoceras rotundatum Sealey and Lucas p. 249 figs. 10A,B, 12F,G, 13D,E, 14E-G,M,N

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
classCephalopodaCuvier 1797
RankNameAuthor
subclassNautilia(Wade 1988)
orderNautilidaAgassiz 1847
suborderLiroceratinaFlower 1955
superfamilyLiroceratoidea()
familyLiroceratidae
genusStearoceras
speciesrotundatum()

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Stearoceras rotundatum Miller and Unklesbay 1942
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Diagnosis
No diagnoses are available
Measurements
partNmeanminimummaximummedians.d.
shell height337.224.650.042.013.0
shell diameter381.836.2130.0116.050.6
shell inflation328.28.0055.051.026.1

Composition: aragoniteo
Environment: marinec
Locomotion: actively mobileo
Life habit: nektobenthico
Diet: carnivoreo
Vision: well-developedc
Created: 2005-01-28 02:35:00
Modified: 2009-09-27 12:10:42
Source: o = order, c = class
References: Kiessling 2004, Kiessling 2003

Age range: base of the Kungurian to the top of the Roadian or 283.30000 to 266.90000 Ma

Collections (9 total)


Time interval Ma Country or state Original ID and collection number
Kungurian283.3 - 274.4USA (New Mexico) Stearoceras rotundatum (83179 276616 276618 276619) Titanoceras rotundatum (type locality: 113092)
Roadian274.4 - 266.9USA (Arizona) Titanoceras rotundatum (105411 113091 113093 113094)