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Yochelcionella snorkorum

Helcionelloida - Helcionellida - Yochelcionellidae

Taxonomy
Yochelcionella snorkorum was named by Vendrasco et al. (2010). Its type specimen is CPC 39760, a shell, and it is a 3D body fossil. Its type locality is Section 417, Georgina Basin, Thorntonia Area, which is in a Floran sand shoal lime mudstone in the Gowers Formation of Australia.

Synonymy list
YearName and author
2010Yochelcionella snorkorum Vendrasco et al. pp. 127 – 128 figs. txt. f. 3L-M; pl. 7

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classHelcionelloidaPeel 1991
orderHelcionellida
superfamilyYochelcionelloidea
familyYochelcionellidae
genusYochelcionella
speciessnorkorum

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.

Diagnosis
ReferenceDiagnosis
M. J. Vendrasco et al. 2010Tall (height ⁄ width >2.0), only slightly cyrtoconic (apex tilted 10 degrees), univalve; large, supra-apical snorkel (snorkel diameter = 0.45 · total width) just under apex, oriented 20–25 degrees from plane of aperture; aperture oval (length ⁄ width c. 1.7); internal ornament of gentle ridges.

Shell subconical, tall, 0.7–0.9 mm long, with slightly curved apex, and with oval aperture; internal ornament of broad, shallow, regularly spaced, comarginal ridges; snorkel large, originating just below apex, extending in opposite direction from curvature of apex, total length unknown; muscle scars bilaterally symmetrical, quarter-moon shaped, just below apex (opposite from snorkel); nacre exposed on internal surface of shell just above the aperture.