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Taxonomy
Obolus (Fordinia) was named by Walcott (1908) [Sepkoski's age data: Cm m Cm u Sepkoski's reference number: 1]. Its type is Obolus (Fordinia) perfectus.
It was reranked as Fordinia by Williams et al. (2000) and Sepkoski (2002).
It was assigned to Obolus by Walcott (1908); to Obolidae by Williams et al. (2000); and to Lingulida by Sepkoski (2002).
It was reranked as Fordinia by Williams et al. (2000) and Sepkoski (2002).
It was assigned to Obolus by Walcott (1908); to Obolidae by Williams et al. (2000); and to Lingulida by Sepkoski (2002).
Subtaxa
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1908 | Obolus (Fordinia) Walcott pp. 64 - 65 |
| 2000 | Fordinia Williams et al. p. 46 |
| 2002 | Fordinia 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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Williams et al. 2000 | Shell suboval, slightly unequivalved; both valves with shallow sulcus; ventral pseudointerarea lacking flexure lines, with narrow, deep pedicle groove bisected by furrow; dorsal pseudointerarea raised, undivided, flattened; ventral visceral area slightly thickened, extending to midvalve, divided by two broad, divergent ridges; dorsal visceral area slightly thickened, bisected by low median ridge, with narrow, long, anterior projection extending almost to anterior margin; dorsal central muscle scars small; ventral vascula lateralia submedian, converging; dorsal vascula lateralia submarginal, slightly arcuate. |
Measurements
No measurements are available
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| Source: g = genus, f = family, o = order, c = class, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Hendy 2009, Nesnidal et al. 2013, Hendy et al. 2009 | |||||