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Straparollus spergenensis

Gastropoda - Euomphalina - Euomphalidae

Taxonomy
Euomphalus spergenensis was named by Hall (1856) [Euomphalus Spergenensis]. It is a 3D body fossil. Its type locality is Spergen Hill, near railroad station at Harristown, southeast of Salem, which is in a Meramecian carbonate limestone in the Salem Formation of Indiana.

It was recombined as Straparollus spergensis by Buddington and Chapin (1929); it was recombined as Straparollus (Straparollus) spergenensis by Yochelson and Saunders (1967); it was recombined as Straparollus spergenensis by Cumings (1906) and Wagner (2023).

Synonymy list
YearName and author
1856Euomphalus spergenensis Hall p. 19
1883Euomphalus spergenensis Hall p. 350 figs. pl. 31 f. 16-19
1906Straparollus spergenensis Cumings p. 1337 figs. pl. 25 f. 16-19
1929Straparollus spergensis Buddington and Chapin
1967Straparollus (Straparollus) spergenensis Yochelson and Saunders pp. 226 - 227
2023Straparollus spergenensis Wagner p. 3813

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classGastropoda
subclassEogastropoda
orderEuomphalina
superfamilyEuomphaloidea()
familyEuomphalidae
genusStraparollus
speciesspergenensis()

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
J. Hall 1856Shell sub-discoid or planorbiform; spire composed of five or six turns, the inner ones coiled in the same plane, two or three of the outer ones only visible in profile; suture well defined on both sides; volutions rounded below with a distinct obtuse angulation on the upper side, a little distance from the suture; umbilicus nearly twice the breadth of the outer volution; aperture oblique, round-oval, with a slight expansion at the angle on the upper side of the volution. Surface marked by close, fine, equal strim of growth. Diameter .30 to 1 inch; height .23 to .45 of an inch.