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Opalia (Rugatiscala) cowlitzensis
Taxonomy
Opalia (Rugatiscala) cowlitzensis was named by Durham (1937). Its type specimen is UCMP 30171 and is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1937 | Opalia (Rugatiscala) cowlitzensis Durham p. 505 figs. Plate 57, figure 18 |
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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.
†Opalia (Rugatiscala) cowlitzensis Durham 1937
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. W. Durham 1937 | Shell minute but moderately heavy; about five well-rounded whorls; proto- conch broken; slightly tabulate on top; sutures deep; ornamented by about 15 prominently rounded axial ribs slightly wider than their interspaces and dying out as they reach the suture; last axial rib of body whorl and one opposite it are considerably heavier than the rest, with a tendency for the corresponding ones on each whorl to be heavier; nine rather prominent spiral threads, slightly heavier than their interspaces, most prominent on greatest convexity of whorl, and faint evidence of a tenth one just above keel; body whorl has well-defined basal keel with about five spiral threads below it; aperture entire and nearly elliptical, but lower portion wider than upper; inner lip slightly thinner than outer lip. |