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Taxonomy
Nuculopsis (Palaeonucula) okawensis was named by Schenck (1939). It is a 3D body fossil.
It was recombined as Nuculopsis okawensis by Hoare et al. (1989); it was recombined as Nuculavus okawensis by Hoare (1993).
It was recombined as Nuculopsis okawensis by Hoare et al. (1989); it was recombined as Nuculavus okawensis by Hoare (1993).
Synonymy list
| Year | Name and author |
|---|---|
| 1939 | Nuculopsis (Palaeonucula) okawensis Schenck p. 23 figs. pl. 7 f. 9-12 |
| 1953 | Nuculopsis (Palaeonucula) okawensis Walter p. 694 figs. Pl 73, figs 9,10 |
| 1989 | Nuculopsis okawensis Hoare et al. p. 584 fig. 3.1–3.2 |
| 1993 | Nuculavus okawensis Hoare p. 376 figs. 2.6 – 2.11 |
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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.
†Nuculavus okawensis Schenck 1939
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. D. Hoare 1993 | Small Nuculavus, subtriangular in shape; beaks incurved, slightly opisthogyrate with inflated umbos raised above hingeline; anterior and posterior margins more strongly curved than ventral margin; lunule and escutcheon not defined; surface marked by numerous, closely spaced (7-8 per mm), comarginal,strap-like ridges; hingement of eight larger, chevron-shaped teeth anteriorly and seven smaller, chevron-shaped teeth posteriorly; anterior and posterior adductor scars prominent; smaller, suboval, anterior protractor scar located dorsoposteriorly to anterior adductor scar; pallial line not distinct. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Mikkelsen and Bieler 2008, Aberhan et al. 2004 | |||||
Age range: base of the Serpukhovian to the top of the Changhsingian or 330.90000 to 252.17000 Ma
Collections (12 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Serpukhovian | USA (Arkansas) | Nuculopsis okawensis (5517 69282 69305) | |
| Serpukhovian | USA (West Virginia) | Nuculavus okawensis (56128 56142 56143 65682) | |
| Changhsingian | USA (Texas) | Nuculopsis okawensis (50002 50009 50012 50017 50021) |