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Wilkingia walkeri
Taxonomy
Allorisma walkeri was named by Weller (1897). It is a 3D body fossil.
It was recombined as Wilkingia walkeri by Busanus and Hoare (1991) and Hoare (1993).
It was recombined as Wilkingia walkeri by Busanus and Hoare (1991) and Hoare (1993).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1897 | Allorisma walkeri Weller p. 265 figs. pl. 20 f. 6–7 |
| 1915 | Allerisma walkeri Girty p. 108 figs. pl. 10 f. 1-2 |
| 1991 | Wilkingia walkeri Busanus and Hoare p. 477 figs. 6.15 – 6.16 |
| 1993 | Wilkingia walkeri Hoare pp. 392 – 394 figs. 7.14 – 7.18 |
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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.
†Wilkingia walkeri Weller 1897
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. W. Busanus and R. D. Hoare 1991 | Wilkingia with subrectangular shape; beaks located about one-fourth length from anterior margin.
Wilkingia walkeri is most similar to W. clavata (McChesney, 1859) but differs in having a relatively longer, subrectangular form with a greater length/height ratio. Wilkingia maxvillenis (Whitfield, 1882b), W. snideri (Elias, 1957), and W. maynardwhitei (Elias, 1957) have less spatulate posterior extremities than W. walkeri. Wilkingia cuyahoga (Herrick, 1888b) is similar and may be conspecific. | |
| R. D. Hoare 1993 | Wilkingia with dorsal and ventral margins subparallel; posterior margin evenly convex, more sharply curved meeting dorsal margin than ventral margin; anterior margin produced, curving sharply dorsally; lunule present, escutcheon not visible; beaks about one-seventh of length from anterior extremity; valve surface flattened centrally, umbonal ridge not prominent; surface ornamented with numerous comarginal undulations. |
Measurements
| part | N | mean | |||||
|---|---|---|---|---|---|---|---|
| height | 1 | 22.0 |
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| Source: g = genus, c = class | |||||
| References: Aberhan et al. 2004, Clapham 2015 | |||||
Age range: Serpukhovian or 330.90000 to 323.20000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Meramecian - Chesterian | USA (Idaho) | Allorisma walkeri (12901) | |
| Chesterian | USA (West Virginia) | Wilkingia walkeri (92956 92966) | |
| Chesterian | USA (Montana) | Allorisma sp. (579) | |
| Serpukhovian | USA (West Virginia) | Wilkingia walkeri (56142 65682) |