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Calycoceras (Gentoniceras) gentoni
Taxonomy
Ammonites gentoni was named by Brongniart (1822). Its type specimen is MNHN.F.J08205, a partial shell, and it is a 3D body fossil. Its type locality is Cote Sainte-Catherine, Rouen, which is in a Cenomanian carbonate chalk in the Craie de Rouen Formation of France.
It was recombined as Gentoniceras gentoni by Thomel (1972); it was recombined as Calycoceras gentoni by Juignet and Kennedy (1976); it was recombined as Calycoceras (Gentoniceras) gentoni by Wright and Kennedy (1990), Wright et al. (1996), Kennedy and Gale (2015) and Sharifi et al. (2016).
It was recombined as Gentoniceras gentoni by Thomel (1972); it was recombined as Calycoceras gentoni by Juignet and Kennedy (1976); it was recombined as Calycoceras (Gentoniceras) gentoni by Wright and Kennedy (1990), Wright et al. (1996), Kennedy and Gale (2015) and Sharifi et al. (2016).
Sister species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1822 | Ammonites gentoni Brongniart pp. 83, 392 figs. pl. 6, fig. 6 |
| 1926 | Eucalycoceras subgentoni Spath p. 83 |
| 1972 | Gentoniceras gentoni Thomel p. 65 |
| 1976 | Calycoceras gentoni Juignet and Kennedy |
| 1990 | Calycoceras (Gentoniceras) gentoni Wright and Kennedy p. 216 |
| 1990 | Calycoceras (Gentoniceras) subgentoni Wright and Kennedy p. 226 figs. P1.56, figs 4,5; P1.57, fig. 4; P1.58, figs 5, 6; P1. 59, figs 14; Text-figs 88K; 90D-F. |
| 1996 | Calycoceras (Gentoniceras) gentoni Wright et al. p. 164 fig. 124,1a–d |
| 2015 | Calycoceras (Gentoniceras) gentoni Kennedy and Gale p. 294 figs. Pl. X, fig. 6; Pl. XXII, fig. 1 |
| 2016 | Calycoceras (Gentoniceras) gentoni Sharifi et al. p. 604 fig. 9 |
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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.
†Calycoceras (Gentoniceras) gentoni Brongniart 1822
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Invalid names: Eucalycoceras subgentoni Spath 1926 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C.W. Wright and W.J. Kennedy 1990 | Macroconchs are 70 to 85 mm in diameter, microconchs 45 to 60 mm. Coiling is, very evolute; whorl breadth is the same as or slightly greater than whorl height. ,The costal whorl section is normally more or less flat-sided with a generally even arch from the inner ventrolateral position. To a diameter ofabout 15 mm primary ribs bear sharp umbilical and inner ventrolateral tubercles; the one or two intercalatories have inner ventrolaterals only; all ribs bear weaker outer ventrolateral and siphonal tubercles. Beyond this size in most specimens the siphonals and ventrolaterals disappear at varying diameters but the umbilicals generally remain strong; slight ventrolateral and siphonal angulation may persist almost to the end of the body chamber. Some individuals however are hypernodose and retain strong tuberculation throughout (Pl. 56, fig. 6; P1. 57, fig. 8) |