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Acrilla (Ferminoscala) becki
Taxonomy
Acrilla (Ferminoscala) becki was named by Durham (1937). Its type specimen is UCMP 30169 and is a 3D body fossil. Its type locality is Woodmans Wharf, which is in a Priabonian marine conglomerate in the Quimper Formation of Washington.
Sister species lacking formal opinion data
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.
†Acrilla (Ferminoscala) becki Durham 1937
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. W. Durham 1937 | Shell tall, slender, thin; about nine post-nuclear whorls; sutures deep; whorls moderately convex; axial sculpture of 17 to 25 irregularly spaced small, rounded thread-like varices, bending slightly backward as they leave suture and then continuing over whorl approximately parallel to right side of spire; interspaces from two to six times width of varices; spiral sculpture of 10 or 11 primary rounded ribs with interspaces approximately equal in width; the uppermost of these primaries may be nearly obsolete; there is usually a fine secondary in interspaces on center of whorl, sometimes almost as prominent as primaries; basal keel slightly more prominent than primary spirals; below it are 10 to 12 closely spaced spirals; aperture ovate; inner lip very thin. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Beu et al. 1990, Kiessling 2004 | |||||
Age range: Priabonian or 37.71000 to 33.90000 Ma
Collections (9 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Priabonian | USA (Oregon) | Acrilla becki (38940 38992 38995 39002 39003 39004 39034) | |
| Priabonian | USA (Washington) | Acrilla becki (type locality: 91606 91607) |