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Epitonium (Boreoscala) keaseyense
Taxonomy
Epitonium (Boreoscala) keaseyense was named by Durham (1937). Its type specimen is LSJU 497 and is a 3D body fossil. Its type locality is Columbia (SU NP-292) - Hickman (1980), which is in a Priabonian deep-water siltstone/mudstone in the Keasey Formation of Oregon.
Sister species lacking formal opinion data
Boreoscala greenlandica, E. expectatum, E. foliaceicostum, E. humphreysi, E. imperiale, E. leroyi, E. multiliniferum, E. muricatum, E. sculptatum, E. paytens, E. gabbi, E. novangliae, E. rushii, E. sericifilum, E. venezuelense, E. emydoneus, E. groenlandica, E. suboptima, E. charitopolos, E. foliaceicostatum, E. foliaceicostum, E. foliaceicostum, E. foliaceiscostatum, E. krebsii, E. replicata
Synonymy list
| Year | Name and author |
|---|---|
| 1937 | Epitonium (Boreoscala) keaseyense Durham p. 498 figs. Plate 57, figure 17 |
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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.
†Epitonium (Boreoscala) keaseyense Durham 1937
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. W. Durham 1937 | Shell large, fairly heavy, about eight or nine moderately-convex whorls, greatest convexity slightly below center; sutures fairly deep; nine fairly heavy axial varices, each reflexed against the corresponding one of preceding whorl and depositing a triangular area of callus in the adjacent sutural area; some varices much wider than others; about 13 primary spiral ribs, of which the first eight are equidistant, with interspaces twice their width, the remaining five become closer together as they approach the suture; spiral ribs pass up posterior side of varices to the top, slightly offset posteriorly as they pass on to top of varices; on better preserved areas of the type, progressively finer secondary and tertiary spirals are discernible; basal keel moderately prominent; below it 12 to 15 closely spaced spiral ribs; aperture ovate. |