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Desmoinesia nana
Taxonomy
Productus nanus was named by Meek and Worthen (1866) [? Productus nanus].
It was recombined as Desmoinesia nana by Hoare (1960).
It was recombined as Desmoinesia nana by Hoare (1960).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1866 | Productus nanus Meek and Worthen p. 320 figs. pl. 26 f. 4a-d |
| 1915 | Marginifera muricata missouriensis Girty p. 350 figs. pl. 30, figs. 2-5 |
| 1932 | Marginifera missouriensis Dunbar and Condra pp. 224, 225 figs. pl. 35, figs. 11-16 |
| 1960 | Desmoinesia nana Hoare pp. 227 - 228 figs. PI. 33, figs. 4-7 |
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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.
†Desmoinesia nana Meek and Worthen 1866
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Invalid names: Desmoinesia missouriensis Girty 1915 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. D. Hoare 1960 | Shell small and quadrangular in outline. Ears small and moderately arched. Beak small and obtuse, overhang- ing the hinge-line slightly. The greatest width and convexity is at mid-length. A typical specimen measures 12.0 mm. wide, 10.9 mm. long, and 6.5 mm. thick.
band of finer costae is present along the anterior margin on specimens with a complete trail. A raised band marks the junc- tion of the margin of the brachial valve. The posterior portion of the valve bears rugae which are coarser near the ears. A reticulate marking is formed by the rugae and costae. The lateral margins of the pedicle valve anterior to the hinge-line form a right angle with the hinge-line with the edges directed dorsally. Numerous spines are scattered over the shell, and are more abundant near the margins. A row of spines follows the base of the umbonal slope and seems to mark a line of weakness of the shell here. Girty (1935) pointed out that many of the shells break along this line and are collected without the cardinal extrem- ities. The surface of the brachial valve is reticulate and slightly concave. No spines were observed. |