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Acutichiton pyrmidalus
Taxonomy
Acutichiton pyrmidalus was named by Hoare et al. (1972) [size estimate of whole animal. ]. Its type specimen is OSU-27158, a valve, and it is not a trace fossil. Its type locality is Jmi-2. Small abandoned drift mine on N side of Buffler Run, which is in a Desmoinesian shallow subtidal limestone/shale in the Vanport Formation of Ohio. It is the type species of Acutichiton.
Synonymy list
| Year | Name and author |
|---|---|
| 1972 | Acutichiton pyrmidalus Hoare et al. pp. 679 – 680 figs. pl. 3 f. 15-22 |
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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 pyrmidalus Hoare et al. 1972
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. D. Hoare et al. 1972 | Valves small, short and narrow. Intermediate valves either lacking a jugal sinus or having only a very shallow one, jugum relatively broad ending in a short to pronounced apex, jugal areas and lateral areas not set off from jugum and valve surface curves from mid-line with a uniform convexity to lateral margin. Tail valve equidimensionally trianglar, anterior margin straight to slightly concave, narrow keel along entire mid-line and lacking a mucro termination, lateral slopes steep and concave to straight, anterolateral margins sharply rounded and underside of posterior margin ridged by coalescence of coarse granules parallel to valve margin. Sutural laminae well developed and narrow. Surface ornamentation of very fine granules arranged in quincunx. Girdle unknown.
Estimated length and width of a reconstructed specimen are 21.0 mm and 4.5 mm respectively. Measurements of individual valves are given in Table 1. |