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Leptellina tennesseensis
Taxonomy
Leptellina tennesseensis was named by Ulrich and Cooper (1936). It is the type species of Leptellina.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1936 | Leptellina tennesseensis Ulrich and Cooper p. 626 |
| 1938 | Leptellina tennesseensis Ulrich and Cooper p. 192 figs. Plate 39 A , figures 1, 2, 4, 5 |
| 1956 | Leptellina tennesseensis Cooper pp. 756 - 758 figs. Plate 187, C, figures 9-13; plate 187, D, figures 14-30; plate 188, A, figures i-ii; plate 189,6, fi |
| 2012 | Leptellina tennesseensis Rasmussen et al. pp. 26 - 27 figs. Plate 5, figures 3–8 |
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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.
†Leptellina tennesseensis Ulrich and Cooper 1936
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. M. O. Rasmussen et al. 2012 | Shell strongly concavo-convex in profile and transverse, subelliptical in outline. Maximum width at hinge line or near posteriormargin, with acute to right angled cardinal angles, possibly alate. Anterior commissure rectimarginate. Some specimens have a weak dorsal fold anteriorly.Ventral valve unevenly convex, more convex anteriorly, with a medium to high, wide apsacline interarea. Small apical pseudodeltidium present in some specimens. Dorsal valve moderately concave, with a low, wide anacline to catacline interarea. Chilidium absent. Unequally parvicostellate ornamentation, usually more marked on dorsal valves with 6–8 costellae per mm along anterior margin of mature specimens and with 7 accentuated costae originating at umbo and extending to the anteriormargin.
Ventral interior with medium to large, broad teeth supported by dental plates that rise from valve floor. Ventral muscle field possibly bilobed and extends anteriorly to about one-fourth of valve length from the posterior margin. Adductor scars developed in a small confined area enclosed by muscle bounding ridges. Dorsal interior with large, bulbous trifid cardinal process. Socket ridges thick and crenulated; deep sockets. Dorsal median septum extends from the thick, swollen area anterior to cardinal process as thick elevation medianly that merges with a strongly bilobed platform, that follows the shell outline. Platform disappears posteriorly just anterior to hinge line. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Hendy 2009, Aberhan et al. 2004, Nesnidal et al. 2013 | |||||
Age range: base of the Darriwilian to the top of the Sandbian or 467.30000 to 453.00000 Ma
Collections (8 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Chazyan | USA (Tennessee) | Leptellina tennesseensis (164884 186138 186616) | |
| Chazyan | USA (Alabama) | Leptellina tennesseensis (186618) | |
| Darriwilian | USA (Virginia) | Leptellina tennesseensis (186614) | |
| Sandbian | Russian Federation (Siberia) | Leptellina tennesseensis (206162) | |
| Sandbian | USA (Virginia) | Leptellina tennesseensis (186619) | |
| Blackriveran | USA (Tennessee) | Leptellina tennesseensis (186617) |