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Acrilla (Undiscala) olympicensis
Taxonomy
Acrilla (Undiscala) olympicensis was named by Durham (1937). Its type specimen is UCMP 30185 and is a 3D body fossil. Its type locality is UCMP loc. A-6, Twin Rivers, Strait of Juan de Fuca, which is in an Oligocene marine shale in the Pysht 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 (Undiscala) olympicensis Durham 1937
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. W. Durham 1937 | Shell of medium size; originally about eight or nine moderately convex whorls; sutures fairly deep; ornamented by approximately 25 prominent, very distinctive axial ribs, which have appearance of true axial ribs on lower part of whorl but are strongly compressed laterally on upper part so as to simulate varices; on central portion of whorl are three fairly prominent spiral ribs with interspaces slightly greater in width, and below lowest one faint evidence of a fourth spiral rib is occasionally seen just above the prominent basal keel; on upper portion of whorl for a space about equal to that occupied by the three primary spiral ribs, there is no evidence of any spiral ornamentation, and it is in this area that axial ribs become varix-like; axial ribs pass over basal keel to aperture; numerous fine spiral ribs superimposed on axial ribs on basal disk; aperture ovate. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Kiessling 2004, Beu et al. 1990 | |||||
Age range: base of the Rupelian to the top of the Late/Upper Oligocene or 33.90000 to 23.04000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Rupelian | USA (Washington) | Acrilla olympicensis (62246) | |
| Chattian | USA (Washington) | Acrilla olympicensis (52357 52362 180405 208172) | |
| Late/Upper Oligocene | USA (Washington) | Acrilla olympicensis (type locality: 40737) |