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Leptellina (Leptellina) occidentalis
Taxonomy
Leptellina occidentalis was named by Ulrich and Cooper (1938). Its type specimen is USNM 92869a and is a 3D body fossil. Its type locality is Ikes Canyon, Toquima Range, which is in a Whiterockian carbonate limestone in the Antelope Valley Formation of Nevada.
It was recombined as Leptellina (Leptellina) occidentalis by Rasmussen et al. (2012).
It was recombined as Leptellina (Leptellina) occidentalis by Rasmussen et al. (2012).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1938 | Leptellina occidentalis Ulrich and Cooper pp. 191 - 192 figs. Plate 39 B, figures 3, 7 |
| 1970 | Leptellina occidentalis Ross p. 65 figs. Plate 9, figures 5, 7 |
| 2012 | Leptellina (Leptellina) occidentalis Rasmussen et al. pp. 24 - 25 figs. Plate 4, figures 18–24; Plate 5, 1–2 |
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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 (Leptellina) occidentalis Ulrich and Cooper 1938
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. M. O. Rasmussen et al. 2012 | Shell gently concavo-convex, transverse, semi-elliptical in outline, with acute, slightly alate cardinal angles. Anterior commissure rectimarginate. Ventral valve weakly to moderately convex, notably towards the anterior margin. Moderately high, weakly apsacline interarea. Small apical pseudodeltidium present. Dorsal interarea flat, low and catacline to hypercline. Chilidium present. Ornament unequally parvicostellate with accentuated costae relatively closely spaced.
Ventral interior with large teeth supported by small, widely divergent dental plates. Ventral muscle field strongly impressed, bilobed and extends anteriorly at about one-third of valve length from the posterior margin. Adductor scars commonly well confined in a small bilobed area enclosed by strong muscle bounding ridges. Dorsal interior with trifid cardinal process with fused socket ridges bases. Median septum moderately elevated, separating two or three pairs of low ridges that become weaker laterally. Median septum extends almost to the anterior margin, but ends anteriorly in a divided, weakly elevated but variably developed subperipheral rim. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Aberhan et al. 2004, Hendy 2009 | |||||
Age range: base of the Whiterockian to the top of the Ashbyan or 470.00000 to 449.60000 Ma
Collections (9 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Whiterockian | USA (Nevada) | Leptellina occidentalis (301 type locality: 88946 104278 104282 104284 104432 104442 210662) | |
| Ashbyan | USA (Alaska) | Leptellina occidentalis (164853) |