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Patellilabia britannica

Gastropoda - Bellerophontida - Bellerophontidae

Taxonomy
Patellilabia britannica was named by Peel (2016). Its type specimen is PMU 29728 and 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
2016Patellilabia britannica Peel pp. 417 - 418 fig. 7

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
classGastropoda
RankNameAuthor
orderBellerophontidaUlrich and Scofield 1897
suborderBellerophontina
superfamilyBellerophontoidea()
familyBellerophontidae
subfamilyKnightitinae
genusPatellilabia
speciesbritannica

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. S. Peel 2016Species of Patellilabia in which the narrow selenizone is concave between bounding spiral cords, becoming flat and raised above the dorsum in the final growth stage.

Species of Patellilabia with dorsal profile varying from uniformly convex to slightly arched at the selenizone, which is concave between spiral cords and traversed by fine lunulae (Fig. 7D–F). Rate of whorl expansion, measured as the ratio of internal height in two consecutive whorls, is 4.4 half a whorl prior to the aperture but increases to more than 6 in the latest half whorl, as the shell expands markedly forwards. Latest growth stage with apertural margins slightly wider than length, the posterior margin extending back beyond open umbilici (Fig. 7A); selenizone at this stage becoming flat-topped and raised (Fig. 7B, C), culminating in a short slit at the anterior margin. Low, pad-like inductura developed medially on the floor of the whorl within the aperture about one-quarter of a whorl back from the finally preserved apertural margin. Ornamentation of final whorl dominated by closely spaced spiral cords of several size orders, with cords becoming increasingly broad and flattopped; spiral ornamentation only weakly expressed on lateral apertural margins. Comarginal growth lines most conspicuous in earlier growth stages, where they delimit a broad shallow sinus (Fig. 7F), and at apertural margins where slight periodicity in the rate of growth produces comarginal folds.