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Acanthoceras whitei
Taxonomy
Acanthoceras whitei was named by Matsumoto (1959) [Acanthoceras whitei Matsumoto, 1959 replaces Acanthoceras turneri White 1888 non n J. de C. Sowerby 1825]. Its type specimen is USNM 20121 and is a 3D body fossil.
Sister species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1889 | Ammonites turneri White p. 26 figs. pl. 5 f. 1-2 |
| 1924 | Acanthoceras turneri Hanna p. 156 |
| 1958 | Calycoceras (Eucalycoceras) turneri Anderson p. 243 |
| 1959 | Acanthoceras whitei Matsumoto p. 82 figs. pl. 22, fig. 1; pl. 39, fig. 1; text-fig. 36 |
| 1960 | Acanthoceras turneri Popenoe et al. p. 1510 |
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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.
†Acanthoceras whitei Matsumoto 1959
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Invalid names: Acanthoceras turneri White 1889 [replaced]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. Matsumoto 1959 | The shell is of moderate size. The whorls grow fairly rapidly, with little overlapping. The umbilicus is slightly less than 30 percent of the shell-diameter. The whorl is broader than high, with Hat, subparallel but slightly convergent, flanks, a broadly arched venter, steep umbilical walls and subangular umbilical shoulders. The outer, probably adult, whorl is ornamented with rectiradiate, distant, equally long ribs, which are broadened and weakened on the venter, rounded ventrolateral tubercles, and prominent umbilical tubercles. The ventral tubercles in three rows are much weakened, being completely obsolete on七he last part of the whorl. The septate immature whorl is ornamented with slightly prorsiradiate, alternately long and short ribs, which are less distant than the ribs of the adult whorl, fairly crowded on the venter, and are of moderate elevation and breadth. The tubercles are fairly strong, but the medioventral tubercles begin to be weakened earlier than others. The ventrolateral tubercles are conical (not clavate); the prominent umbilical tubercles are well separated from the umbilical margin. The suture is less perfectly exposed on the holotype, but on the Indian example it was well described and illustrated by Kossmat (1897, P.3[110], pl.3 [14], fig.3). |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: Cenomanian or 100.50000 to 93.90000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Cenomanian | France (Normandie) | Acanthoceras whitei (230777) |