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Strepsodiscus paucivoluta

Gastropoda - Bellerophontida - Tropidodiscidae

Taxonomy
Raphistoma paucivoluta was named by Calvin (1892). It is a 3D body fossil.

It was recombined as Pelagiella paucivoluta by Dake and Bridge (1932); it was recombined as Strepsodiscus paucivoluta by Yochelson and Nuelle (1985) and Wagner (2023).

Synonymy list
YearName and author
1892Raphistoma paucivoluta Calvin p. 147
1932Pelagiella paucivoluta Dake and Bridge p. 740 figs. pl. 12 f. 8
1985Strepsodiscus paucivoluta Yochelson and Nuelle pp. 734 – 739 figs. 1-2
2023Strepsodiscus paucivoluta Wagner p. 3228

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classGastropoda
orderBellerophontidaUlrich and Scofield 1897
superfamilyTropidodiscoidea
familyTropidodiscidae()
subfamilyTemnodiscinae
genusStrepsodiscus
speciespaucivoluta()

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.

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Diagnosis
ReferenceDiagnosis
E. L. Yochelson and L. M. Nuelle 1985Strongly compressed, lenticular open-coiled gastropods. Early growth stages unknown, but possibly consisting of several closely coiled whorls before developing open coiling. Body whorl wide and very
compressed. Whorl profile of body whorl bilaterally symmetrical, lanceolate; dorsum narrow and almost knifelike in cross section;
inner margin relatively sharp, but whorl expanding rapidly and in a step-like manner a short distance inward from margin, then
curving outward uniformly to periphery located about a quarter of distance between inner margin and dorsum. Growth lines slightly curved for half of distance of lateral slopes before curving
strongly and backwards toward dorsum.
Measurements
partNmean
height17.00

Composition: aragoniteo
Composition 2: low Mg calciteo
Entire body: yesg
Adult length: 10 to < 100g
Adult width: 10 to < 100g
Adult height: 10 to < 100g
Locomotion: slow-movingo
Life habit: low-level epifaunalo
Diet: detritivoreo
Vision: limitedc
Created: 2009-03-04 10:02:57
Modified: 2009-03-04 12:02:57
Source: g = genus, o = order, c = class
References: Hendy 2009, Kiessling 2004

Age range: base of the Trempealeauan to the top of the Gasconadian or 492.50000 to 477.70000 Ma

Collections (4 total)


Time interval Ma Country or state Original ID and collection number
Trempealeauan492.5 - 485.4USA (Missouri) Strepsodiscus paucivoluta (8232 8695)
Gasconadian485.4 - 477.7USA (Texas) Pelagiella paucivoluta (56498 56500)