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Pararaphistoma disciformis

Gastropoda - Euomphalina - Lesueurillidae

Taxonomy
Liospira disciformis was named by Longstaff (1924). Its type specimen is G 25329, a shell, and it is a 3D body fossil. Its type locality is Balclatchie Farm, Ayrshire, Girvan, which is in a Burrellian carbonate limestone/conglomerate in the Balclatchie Formation of the United Kingdom.

It was recombined as Pararaphistoma disciformis by Wagner (2023).

Synonymy list
YearName and author
1924Liospira disciformis Longstaff pp. 410 - 411 figs. pI. 31 f. 1-3
2023Pararaphistoma disciformis Wagner p. S1020

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
classGastropoda
RankNameAuthor
subclassEogastropoda
orderEuomphalina
superfamilyEuomphaloidea()
familyLesueurillidae
subfamilyPararaphistomatinae
genusPararaphistoma
speciesdisciformis()

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.

†Pararaphistoma disciformis Longstaff 1924
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Diagnosis
ReferenceDiagnosis
J. D. Longstaff 1924Shell large, discoidal, spire low, flat or slightly convex. Whorls about six, flattened convexo-concave above; periphery acutely angular, somewhat flange-like, overlapping the suture, and having a thread at the margin, in close contact with another thread or swelling on the upper part of the succeeding whorl. The greater portion of the band forms a shallow groove above the periphery ; upper limit indistinct, chiefly indicated by the lines of growth; point of the sharply angular sinus situated on the peripheral thread. Lines of growth above, coarse at intervals, with finer ones intercalated, curving back very obliquely to the band ; below the S run first obliquely forward, then almost vertically, after which they advance in a very convex curve, and finally turn ahnost direct into the umbilicus. Base convex, with a wicle, deep, and subangular umbilicus. Aperture triangular, nearly horizontal above, angular at the upper outer edge, convex and prominent below.