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Retispira mowensis
Taxonomy
Retispira mowensis was named by Peel (2016). Its type specimen is PMU 29765, 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
| Year | Name and author |
|---|---|
| 2016 | Retispira mowensis Peel pp. 416 - 417 figs. 11S, V, W |
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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.
†Retispira mowensis Peel 2016
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. S. Peel 2016 | Species of Retispira with prominent, acute, median dorsal keel bearing a narrow selenizone.
Species of Retispira with an acute median keel on final whorl (Fig. 11W). Dorsal profile arched medially, passing rapidly around dorso-lateral extremities into open umbilici. Adaperturally convex growth lines indicate aperture with broad, shallow, dorsal emargination culminating in a median slit of unknown depth. At the earliest observed growth stage, about one whorl prior to the aperture, the selenizone is flat-topped and flush with the upper surface of the dorsum (Fig. 11W, lower edge). Subsequently, the keel rises with concave sides above the surface of the dorsum, with the narrow selenizone forming its acute upper edge. Apertural margins with slight constrictions in rate of expansion producing undulose and periodically rugose growth lines (Fig. 11S). Ornamentation dominated by spiral cords of two or three size orders crossed by growth lines. |
Measurements
No measurements are available
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| Source: f = family, o = order, c = class | |||||
| References: Kiessling 2004, Hendy 2009 | |||||