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Arcochiton raymondi
Taxonomy
Arcochiton raymondi was named by Hoare and Sturgeon (1976) [estimated body size given plate dimensions.]. Its type specimen is OSU-30363, a valve (head plate), 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 Arcochiton.
Synonymy list
| Year | Name and author |
|---|---|
| 1976 | Arcochiton raymondi Hoare and Sturgeon pp. 842 - 845 figs. pI. 1 f. 1-20; pl. 2 f. 4-12 |
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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.
†Arcochiton raymondi Hoare and Sturgeon 1976
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. D. Hoare and M. T. Sturgeon 1976 | Valves small and relatively short. Shell material thin except for the posterior end of tail valve. Head and intermediate valves with a small apex, that of head valve being less distinct, lateral and jugal areas not set off from the jugum and lateral surfaces curve with slight convexity from midline to lateral margins. Tail valve triangular, anterior margin slightly concave, narrow concave keel extends along entire midline and lacks a mucro termination, lateral slopes steep and concave, posterior termination curved up with under surface marked by longitudinally arranged ridges of coalesced granules and shallow medial groove. Sutural laminae well developed, thin and narrow. Surface ornamentation of all valves consists of intermediate-sized granules arranged in intersecting spiral lines and numbering approximately 192 per sq. mm. Girdle unknown.
Estimated length |