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Hiscobeccus gigas
Taxonomy
Lepidocyclus gigas was named by Wang (1949) [Wang might have attributed this to Billings.
According to Rasmussen (2013):
= 1957 Lepidocyclus perlamellosa (pars) Ross (non Whitfield, 1878), p. 477, pl. 39, figs 1–5.
= Lepidocyclus capax Ross (non Conrad, 1842), p. 477, pl. 39, figs 21, 24–27.
= Lepidocyclus capax; Bolton (non Conrad, 1842), pl. 3, fig. 1.]. It is a 3D body fossil.
It was recombined as Hiscobeccus gigas by Amsden (1983) and Rasmussen (2013).
It was recombined as Hiscobeccus gigas by Amsden (1983) and Rasmussen (2013).
Synonymy list
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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.
†Hiscobeccus gigas Wang 1949
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. M. O. Rasmussen 2013 | Medium to large, sub-circular shell, with maximum width between mid-valve and anterior third of valve length. Dorsi-biconvex, unisulcate. Ornament of simple, sub-rounded and relatively low costae, numbering to approximately 18. Dorsal fold with four costae and ventral sulcus with three costae. Entire shell lamellose. Ventral valve weakly convex with pronounced sulcus, forming truncated, tongue-like structure. Dorsal valve moderately convex with moderately elevated fold, and seven to eight costae on each side of the fold. Ventral valve possesses a high, curved palintrope which extends posteriorly as an incurved beak. Delthyrium low, wide. Dorsal beak strongly incurved and, thus, hidden in the ventral delthyrium. Seen laterally the commissural plane bends ventrally at a characteristic obtuse angle just anterior to the umbonal zone. Interiors not examined. Dorsal interior possibly with median septum. |
Measurements
No measurements are available
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| Source: g = genus, f = family, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Hendy et al. 2009, Nesnidal et al. 2013, Hendy 2009 | |||||
Age range: Richmondian or 449.60000 to 445.50000 Ma
Collections (23 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Katian | Canada (Quebec) | Lepidocyclus gigas (158525) | |
| Maysvillian - Richmondian | USA (Wyoming) | Lepidocyclus gigas (35350) | |
| Richmondian | Canada (Quebec) | Hiscobeccus gigas (158539) | |
| Richmondian | USA (Nevada) | Lepidocyclus gigas (78048 78053) | |
| Richmondian | USA (Wyoming) | Lepidocyclus gigas (13497 65239) | |
| Richmondian | Canada (Manitoba) | Hiscobeccus gigas (166389 166392 166393 166394 166395 166396 166400 166408 166464 166465 166504 166635 166636 166704 192101) | |
| Richmondian - Gamachian | Canada (Manitoba) | Lepidocyclus gigas (23013) |