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Eirlysia ceramicorum

Gastropoda - Murchisoniina - Phymatopleuridae

Taxonomy
Eirlysia ceramicorum was named by Peel (2016). Its type specimen is BGS T4959A, a shell, and it is a 3D body fossil. Its type locality is Pot Bank Quarry Locality 3, Congleton Edge, which is in an Alportian carbonate mudstone in the Morridge Formation of the United Kingdom.

Synonymy list
YearName and author
2016Eirlysia ceramicorum Peel pp. 423 - 424 figs. 9D, G, H, K, O, R

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classGastropoda
subclassOrthogastropoda
orderMurchisoniina
superfamilyEotomarioidea
familyPhymatopleuridae
genusEirlysia
speciesceramicorum

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.

Eirlysia ceramicorum Peel 2016
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Diagnosis
ReferenceDiagnosis
J. S. Peel 2016Globose species of Erlysia with inflated, uniformly convex base, well developed reticulate ornamentation and concave selenizone, the lower edge of which forms the whorl periphery.

Species of Eirlysia in which the height of the dextral, turbiniform shell is about 75% of its width. There are about six whorls, with about three initial whorls occurring prior to the sudden development of the selenizone between bounding cords (Fig. 9D, arrow). Earliest stages of protoconch poorly known, but followed by about two whorls in which spiral ornamentation dominates (Fig. 9O, arrow). Upper whorl surface shallowly convex, embracing the previous whorl at just below the selenizone, becoming shallowly convex just prior to the upper edge of the selenizone. Selenizone flat or shallowly concave, slightly depressed between bounding cords, the lower of which forms the whorl periphery; selenizone ornamented by obscure fine lunulae. Base uniformly convex; width of umbilicus and form of inner lip not known. Below the selenizone, growth lines indicate that the apertural margin is initially shallowly prosocyrt before passing into a broad, shallow, sinus on the base. Following the appearance of the selenizone, ornamentation is dominated by spiral and comarginal cords of equal emphasis. Initially three spiral cords are present on the upper whorl surface (Fig. 9D) but this number has increased to ten in the latest observed growth stage (Fig. 9R). Intersections of spiral and comarginal cords are slightly nodose on the upper whorl surface, with both spiral and comarginal elements becoming thinner and less pronounced as the selenizone is approached; numerous fine growth lines are seen between the comarginal cords (Fig. 9R). Below the selenizone ornamentation is dominated by spiral cords of variable thickness; comarginal ornamentation consists of growth lines although a slight periodicty reflects the comarginal cords of the upper whorl surface.