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Calycoceras (Gentoniceras) leonense
Taxonomy
Eucalycoceras leonense was named by Adkins (1928) [= Metacalycoceras ? sp. 2; Adkins 1928 p. 242, pi. 28, fig. 2; pi, 29, fig. 2.]. Its type specimen is TMM 34051 and is a 3D body fossil. Its type locality is Loc. 2412. Pepper Creek, which is in a Cenomanian carbonate limestone in the Eagle Ford Formation of Texas. It is the type species of Paraconlinoceras.
It was recombined as Eucalycoceras (Proeucalycoceras) leonense by Thomel (1969); it was recombined as Calycoceras leonense by Cobban and Scott (1972); it was recombined as Calycoceras (Gentoniceras) leonense by Cobban and Scott (1987); it was recombined as Paraconlinoceras leonense by Kennedy and Cobban (1990) and Wright et al. (1996).
It was recombined as Eucalycoceras (Proeucalycoceras) leonense by Thomel (1969); it was recombined as Calycoceras leonense by Cobban and Scott (1972); it was recombined as Calycoceras (Gentoniceras) leonense by Cobban and Scott (1987); it was recombined as Paraconlinoceras leonense by Kennedy and Cobban (1990) and Wright et al. (1996).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1928 | Eucalycoceras leonense Adkins p. 240 figs. pl. 28, fig. 1 ; pi. 29, fig. 3 |
| 1969 | Eucalycoceras (Proeucalycoceras) leonense Thomel p. 650 |
| 1972 | Calycoceras leonense Cobban and Scott p. 60 figs. Plate 3, figures 1-4 |
| 1987 | Calycoceras (Gentoniceras) leonense Cobban and Scott p. 4 figs. pl. 1 fig 1-17, text-fig. 2 |
| 1990 | Paraconlinoceras leonense Kennedy and Cobban pp. 118 - 121 figs. Plate 6, figs. 1-6; Plate 7, figs. 14, 16-22; Plate 9, figs. 26, 27, 29, 30; text-figs. 19A-H |
| 1996 | Paraconlinoceras leonense Wright et al. p. 158 fig. 119,1a,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.
†Calycoceras (Gentoniceras) leonense Adkins 1928
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. J. Kennedy and W. A. Cobban 1990 | The species appears to be markedly dimorphic; 2 complete microconchs are 50 and 61 mm diameter, two macroconchs 90 and 92 mm diameter. The early growth stages are not shown by the Texas material. In middle growth as far as the beginning of the adult body chamber, the coiling is evolute, with U = 27-33 % of diameter, shallow, with a rounded wall. Intercostal whorl section depressed, reniform, the greatest breadth well below mid-flank. Costal section trapezoidal-polygonal. There are generally 12-14 primary ribs per whorl. They arise at the umbilical seam, strengthen into sharp bullae on the umbilical shoulder and give rise to sharp, distant, prorsiradiate primary ribs. At the smallest diameters visible these bear small inner ventrolateral tubercles that are no wider than the rib, linked by a strong rib to a clavate outer ventrolateral and a somewhat weaker siphonal tubercle. At small sizes ribs may arise in pairs from the umbilical bullae, but in general the primaries alternate regularly with secondaries inserted at or below midflank. The latter strengthen to equal the primaries at the ventrolateral shoulder, where they develop a full complement of tubercles. The inner ventrolateral tubercles decline around the outer whorl of the phragmocone, and the beginning of the body chamber bears outer ventrolateral and siphonal tubercles only. The umbilical seam of the mature body chamber egresses markedly, to give U = up to 37%. Umbilical bullae migrate out to the inner flank, before declining and disappearing just before the adult aperture. The outer ventrolateral and siphonals persist to the last quarter whorl before the adult aperture, thereafter they decline. The last few ribs before the aperture are weakened, and extend to the umbilical shoulder without bullae. Suture with broad, symmetrically bifid E/L, narrow bifid L and broad L/U,. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: base of the Middle Cenomanian to the top of the Cenomanian or 99.60000 to 93.90000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Cenomanian | USA (Colorado) | Calycoceras leonense (230801) | |
| Middle Cenomanian | USA (Texas) | Eucalycoceras leonense (177076 234116) |