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Epitonium (Cirsotrema) howei
Taxonomy
Epitonium (Cirsotrema) howei was named by Durham (1937). Its type specimen is CAS 7004 and is a 3D body fossil.
Sister species lacking formal opinion data
Cirsotrema cochlea, Cirsotrema cortezi, Cirsotrema firmatum, Cirsotrema koeneni, Cirsotrema lyratum, Cirsotrema undulatum, Cirsotrema lyratum, Cirsotrema tamanense, Cirsotrema bouillei, 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 (Cirsotrema) howei Durham p. 492 figs. Plate 56, figure 8 |
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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 (Cirsotrema) howei Durham 1937
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. W. Durham 1937 | Shell of moderate size, fairly heavy,
having about seven whorls (incomplete); whorls well rounded; sutures deep; orna- mented by nine prominent varices strongly reflexed posteriorly, bending slightly back as they leave the suture and then straightening out to form slight coronating points just below the suture; interspaces nearly three times as wide as base of varices; on median half of whorl there are about four low, heavy threads twice as broad as their interspaces; areas above and below the four spirals appar- ently obsolete of spiral ornamentation; between the lowest two spirals there is usually a fine secondary rib, faint ex- pressions of the spiral ribs show on the outer surface of the varices; "basal keel" very prominent; aperture slightly ovate. |