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Euphemites jacksoni
Taxonomy
Euphemus jacksoni was named by Weir (1931). Its type specimen is LL 248, a shell, and it is a 3D body fossil.
It was recombined as Euphemites jacksoni by Moseley (1953) and Peel (2016).
It was recombined as Euphemites jacksoni by Moseley (1953) and Peel (2016).
Synonymy list
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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.
†Euphemites jacksoni Weir 1931
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. S. Peel 2016 | Species of Euphemites with length:width ratio of about 1.25 and a maximum observed length of 12 mm. Dorsum uniformly convex, with greatest whorl width adjacent to the sudden curvature into the pseudo-umbilici; rate of whorl expansion about 2.4; umbilici closed, pseudo-umbilici usually shallow. Spirally lirate inductura extending from the aperture and covering posterior areas of the shell up to half a whorl prior to the apertural margin (Fig. 4D); breakage of the inductura reveals growth lines and the selenizone of the underlying, normal, shell surface (Fig. 6P, arrows). Lirae sharply defined, varying in number between 19 and 31, average 25 (n = 16), with highest number in the broadest shells (Fig. 5). Lirae continuous but often slightly displaced during growth, with frequent introduction of short ephemeral lirae; new lirae usually introduced at the umbilical margins. Anterior half whorl without lirae, crossed by comarginal growth lines which vary from obscure to slightly rugose (Fig. 4E) and increase in curvature as the median slit and selenizone are approached. Slit broad and short, its margins and those of the selenizone often delimited by raised cords (Fig. 4C, F, I). |