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Leptoskelidion
Taxonomy
Leptoskelidion was named by Amsden (1974) [Sepkoski's age data: O Ashg-u S Ldov-l Sepkoski's reference number: 764]. Its type is Leptoskelidion septulosum.
It was assigned to Linoporellidae by Amsden (1974) and Williams et al. (2000); and to Orthida by Sepkoski (2002).
It was assigned to Linoporellidae by Amsden (1974) and Williams et al. (2000); and to Orthida by Sepkoski (2002).
Species
L. loci, L. septulosum (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1974 | Leptoskelidion Amsden pp. 47 - 48 |
| 2000 | Leptoskelidion Williams et al. p. 838 |
| 2002 | Leptoskelidion Sepkoski |
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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.
G. †Leptoskelidion Amsden 1974
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†Leptoskelidion loci Cocks 1982
†Leptoskelidion septulosum Amsden 1974
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. W. Amsden 1974 | Biconvex shells with faint, obscure costellae. The ventral teeth are supported on dental plates that extend forward to encircle the elliptical muscle field. In the dorsal valve the expanded brachiophore bases unite with the median ridge to make a sessile cruralium. The cardinal process has a linear shaft that expands at its posterior end into a bulbous myophore. The shell substance is presumably punctate. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013 | |||||
Age range: base of the Hirnantian to the top of the Porkuni or 445.20000 to 443.70000 Ma
Collections (11 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Porkuni | Norway (Oslo) | L. loci (157129 159374) | |
| Porkuni | Norway | L. loci (193280) | |
| Hirnantian | USA (Missouri) | L. septulosum (55456 55457 55459) | |
| Hirnantian | Norway (Oslo) | L. loci (159519 159520 159523) | |
| Hirnantian | USA (Oklahoma) | L. septulosum (55460) | |
| Hirnantian | Norway (Oslo-Asker Dist.) | L. sp. (439) |