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Acutichiton pannuceus
Taxonomy
Acutichiton pannuceus was named by Hoare and Mapes (1985). Its type specimen is OSU 36971, a valve (head plate), and it is not a trace fossil. Its type locality is Gullies south of pond dam, 250 meters north of the Lost Creek Cemetery, 0.4 km east of Highway 59 and 8.3 km northeast of Jacksboro, which is in a Virgilian marine horizon in the Graham Formation of Texas.
Synonymy list
| Year | Name and author |
|---|---|
| 1985 | Acutichiton pannuceus Hoare and Mapes pp. 1324 – 1326 fig. 1.1–1.15 |
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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.
†Acutichiton pannuceus Hoare and Mapes 1985
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. D. Hoare and R. H. Mapes 1985 | Small (25.0 + rnm), thick valved polyplacophorans. Head valve subsemicircular; intermediate valves strongly arched, clearly divided into central and lateral areas; tail valve coarsely wrinkled in posterior and hypotyche regions, forming a posterior area. Sutural laminae relatively wide and broadly rounded. Ornament of small granules arranged in a quincunx pattern, being finer on lateral and posterior areas than central areas.
Head valve nearly semicircular, moderately high; apex projecting slightly; anterior and lateral slopes gently convex; ventrally, a short apical area (0.45 mm) extending less than midlength on the lateral margins and a low rounded ridge curving across the surface at about midlength; surface ornamented with fine, closely spaced granules of equal size crossed by several coarse growth lines giving a wrinkled appearance. Intermediate valves highly arched, more so posteriorly; anterior margin having a faint to pronounced jugal sinus; lateral margins gently convex curving into straight posterior margins; apex slightly produced, side-slopes gently surface divided into a central area narrowly triangular, slightly raised, latera1 areas, distinguished by finer granules and coarser growth lines, giving a strongly wrinconvex; kled appearance in the lateral areas; large apiandcal areas (1.0 mm long) extending ventrally as flat, broadly tapering ridges to the lateral margins and pronounced ridges extending posteriorly from the base of heavy, relatively broad sutural laminae. Tail valve triangular; jugal area slightly set off by shallow sulci and ending in a blunt, terminal mucro; anterior margin slightly sinuate; lateral margins nearly straight terminating at mucro; slightly raised posterior area a narrow band, low on side-slopes, extending from mucro to anterolateral margin, distinguished by finer granules and coarsely wrinkled growth lines; ventrally, a long hypotyche extending anteriorly along the lateral margins as a narrowing area is marked by fine granules and coarsely wrinkled growth lines; and, low broad ridges extend posteriorly from the base of the broad, relatively heavy sutural laminae. |