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Matthevia wahwahensis
Taxonomy
Matthevia wahwahensis was named by Vendrasco and Runnegar (2004) [Matthevia variabilis RUNNEGAR, POJETA, TAYLOR, AND COLLINS, 1979,
p. 1377, pl. 1, figs. 5–13, 15–18.
Matthevia sp. YOCHELSON, 1966, pl. 1, figs. 6–11, 15–17, 19–22, 30–
32, 36, 37, 40, 41.]. Its type specimen is LACMIP 12821, 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.
Synonymy list
Year | Name and author |
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2004 | Matthevia wahwahensis Vendrasco and Runnegar pp. 683 - 684 fig. 9 |
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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.
†Matthevia wahwahensis Vendrasco and Runnegar 2004
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Diagnosis
Reference | Diagnosis | |
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M. J. Vendrasco and B. Runnegar 2004 | Intermediate valves large (up to 4 cm long), elongate (mean length/width 1.9), subconical, barbed arrowhead-shaped outline in dorsal view, apical area flat to slightly concave, two tunnels extending from anterior of valve to near the apex, deep anterior embayment; tail valve similar to intermediate valve except taller and narrower, convex apical area; head valve small (mean 1 cm long), flat, thin, oval, with subcentral mucro.
ntermediate valves (Fig. 9.1–9.6) subconical; elongate (mean length/width 1.9, SD = 0.354, n = 108); mean height, 0.714 cm (SD = 0.217, n = 108); flat to slightly convex jugal ridge, sharp change in slope of sides along dorsal-lateral margin, otherwise no clear valve areas; sides diverge straight from apex or flare out at anterior end of valve; deep embayment at anterior end of dorsal surface; apex pointed, small apical angle (mean 28.9 degrees, SD = 3.15, n = 108); apical area along ventral margin extends 44 percent of total length of valve, flat to concave, with deep rounded embayment; two tunnels penetrate valve, parallel to valve midline, extending from anterior surface to near apex, roughly oval in cross section (wider than tall), dorsal tunnel aperture sometimes circular, ventral tunnel aperture flat on ventral border (just above apical shelf); thickness of valve greatest between tunnels; slightly convex sides perpendicular to apical area; valve gently bent from anterior to posterior along ventral margin except near apex where slope increases dramatically, producing downward-trending beak; apical shelf and jugal ridge diverge from each other at a mean angle of 23.9 degrees (SD = 5.3, n = 108); sculpture lacking due to coarse preservation; valve ontogeny appears roughly isometric. |
Measurements
No measurements are available
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Source: g = genus, c = class | |||||
References: Kiessling 2003, d'Eichwald 1840 |