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Imonautilus meeki

Cephalopoda - Nautilida - Trigonoceratidae

Taxonomy
Imonautilus meeki was named by Niko and Mapes (2007). Its type specimen is OUZC 5236, a shell, and it is not a trace fossil. Its type locality is Loc. 1. USGS 14369. Road cut on se side US 65, 0.8 km sw of Peyton Creek Bridge, which is in a Serpukhovian offshore grainstone/shale in the Imo Formation of Arkansas. It is the type species of Imonautilus.

Synonymy list
YearName and author
2007Imonautilus meeki Niko and Mapes pp. 300 – 301 figs. 5, 6

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
classCephalopodaCuvier 1797
RankNameAuthor
subclassNautilia(Wade 1988)
orderNautilidaAgassiz 1847
suborderTainoceratinaShimansky 1964
superfamilyTrigonoceratoidea(Hyatt 1884)
familyTrigonoceratidae
genusImonautilus
speciesmeeki

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.

†Imonautilus meeki Niko and Mapes 2007
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Diagnosis
ReferenceDiagnosis
S. Niko and R. H. Mapes 2007Coiled genus of trigonoceratids, evolute without strong compression; juvenile shell Stroboceras-like with shallow ventral groove, but ventral groove becomes reduced at or near maturity on the roundly inflated venter; ventrolateral and lateral grooves and ventral ridges strong in juvenile conch, but become obsolescent or subdued with maturity; profiles of adoral whorls are subsemicircular to depressed suboval, with width/height ratios attaining 1.11; umbilical angle well defined in adoral whorls; dorsal (contact) groove shallow and narrow; adoral growth lines are not accentuated as in Stroboceras; sutures with shallow lateral lobes; siphuncle subcentral.
Measurements
No measurements are available
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 2003, Kiessling 2004

Age range: Serpukhovian or 330.90000 to 323.20000 Ma

Collections (2 total)


Time interval Ma Country or state Original ID and collection number
Serpukhovian330.9 - 323.2USA (Arkansas) Imonautilus meeki (type locality: 5517 69282)