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Nisusia cloudi
Taxonomy
Nisusia cloudi was named by Shaw (1957) [Nisusia aff. N. amii Shaw 1954 GSA Bulletin 65:1043;
Nisusia aff. N. amii Shaw 1955 J. Paleo 29: 790 pl. 76f. 7-8]. Its type specimen is UW-258n, a shell, and it is not a trace fossil. Its type locality is SA-EC-1, which is in a Delamaran carbonate limestone/shale in the Parker Slate Formation of Vermont.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1957 | Nisusia cloudi Shaw p. 786 figs. pl. 99 f. 5-8 |
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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.
†Nisusia cloudi Shaw 1957
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. B. Shaw 1957 | Most of the brachiopods collected from Locality SA-EC-1 belong to what appears to be a new species closely related to Nisusia amii. They differ from that species in having the rough irregular ribbing of N. festinata instead of the smooth fine ribbing of N. amii. It is possible that the Parker form is a transition from N, festinata to N. amii.
Undistorted shells are about 15 mm. wide. The ribs are irregular, thickening slightly around what seem to be spine bases. Ribs increase by both intercalation and bifurcation. The cardinal margin is straight and is uniformly narrower than the greatest width of the shell. This contrasts with N. festinata in which the hinge line is the widest point on the shell. |