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Orthriochiton utahensis
Taxonomy
Orthriochiton utahensis was named by Vendrasco and Runnegar (2004). Its type specimen is LACMIP 12828, a valve, and it is a 3D body fossil. Its type locality is LACMIP 17160, LC 19.5, Gray Hills, northwest end of Lawson Cove, Wah Wah Mt., which is in a Sunwaptan carbonate dolomite in the Notch Peak Formation of Utah. It is the type species of Orthriochiton.
Synonymy list
| Year | Name and author |
|---|---|
| 2004 | Orthriochiton utahensis Vendrasco and Runnegar p. 686 fig. 12.14–12.31 |
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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.
†Orthriochiton utahensis Vendrasco and Runnegar 2004
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. J. Vendrasco and B. Runnegar 2004 | Small (holotype 5.0 mm long, 3.0 mm wide), delicate intermediate valves with straight side slopes diverging at a 60–70-degree angle (i.e., jugal angle); delicate tail valves with posterior mucro and vertical posterior margin, sides of valve more rounded; possible head valves thin, flat, with subcircular outline in dorsal view.
Intermediate valves (Fig. 12.14–12.25) tent-shaped, delicate, small, longer than wide (holotype 5.0 mm long, 3.0 mm wide); thin, gently sloping jugal ridge, jugal angle between 60 and 70 degrees; sides straight; apical angle between 50 and 55 degrees; ventrolateral margins straight; anteriolateral margins convex, rounded; deep embayment (extends nearly half the length of the valve); ventroposterior portion of valve along midline slightly thickened. Tail valves (Fig. 12.27–12.31) delicate, small, twice as long as wide (6.0 mm total length; 3.0 mm width); gently sloping jugal ridge, widens towards anterior margin, slopes downward slightly at the posterior end; slightly convex sides; terminal mucro with gentle slope, posterior margin flat to slightly concave, perpendicular to jugal ridge; sides diverge slightly from anterior to posterior, ventrolateral margins straight to slightly convex; short embayment (extending 15 percent of total length of valve); small depression on ventral surface of valve underneath mucro. Possible head valves (Fig. 12.26) subcircular, small (2–3 mm in diameter), flat, thin; indistinct mucro. |
Measurements
No measurements are available
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| Source: c = class | |||||
| Reference: Kiessling 2003 | |||||