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Metasigaloceras rusticum
Taxonomy
Ammonites rusticus was named by Sowerby (1817) [DISTRIBUTION: Turonian; Europe.]. It is a 3D body fossil. Its type locality is Combpyne Rousdon, which is in a Turonian marine limestone in the Middle Chalk Formation of the United Kingdom.
It was recombined as Metasigaloceras rusticum by Kennedy (1994) and Wright et al. (1996).
It was recombined as Metasigaloceras rusticum by Kennedy (1994) and Wright et al. (1996).
Synonymy list
| Year | Name and author |
|---|---|
| 1817 | Ammonites rusticus Sowerby p. 44 figs. pl. 177 |
| 1994 | Metasigaloceras rusticum Kennedy p. 259 |
| 1996 | Metasigaloceras rusticum Wright et al. p. 175 fig. 130,4a,b |
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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.
†Metasigaloceras rusticum Sowerby 1817
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. W. Wright et al. 1996 | Early whorls similar to those of Mammites; later whorls very evolute, with trapezoidal whorl section and very large, blunt lateral tubercles giving rise to broad, low ribs ending in low ventrolateral tubercles; venter flat and smooth. |