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Gyrodes expansa
Taxonomy
Gyrodes expansa was named by Gabb (1864) [ANSP 4245 is lectotype.]. It is extant. Its type specimen is ANSP 4245, a shell.
It was recombined as Gyrodes (Sohlella) expansus by Popenoe et al. (1987).
It was recombined as Gyrodes (Sohlella) expansus by Popenoe et al. (1987).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1864 | Gyrodes expansa Gabb p. 108 figs. Pl. 19, fig. 62a-b [only; not fig. 62c |
| 1927 | Gyrodes expansa Stewart pp. 328 - 329 figs. Plate XXII, figs. la, and 3 |
| 1987 | Gyrodes (Sohlella) expansus Popenoe et al. pp. 88 - 89 figs. 6.33-6.38 |
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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.
Gyrodes expansa Gabb 1864
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. P. Popenoe et al. 1987 | Shell thick for the subgenus, medium to moderately large sized, surface strongly textured by growth lines especially in large individuals; spire about 24% of total height; suture appressed, at posterior third of penultimate whorl; shoulder roundly tabulate; whorl profile flattened abapical to the tabulation, then roundly inflated; umbilical margin roundly subangulate; umbilicus steeply sloping; growth line obliquely prosocline with antispiral flexure within the umbilicus; aperture broadly tear-drop shaped; outer lip thin, projected posteriorly; inner lip thin anteriorly, thickened posteriorly, wrapping onto the last whorl at the umbilical angulation. |
Measurements
No measurements are available
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| Source: g = genus, f = family, c = class | |||||
| References: Aberhan et al. 2004, Kiessling 2004 | |||||
Age range: base of the Cenomanian to the top of the Early/Lower Maastrichtian or 100.50000 to 66.00000 Ma
Collections (13 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Cenomanian | USA (California) | Gyrodes expansa (167602) | |
| Turonian | USA (California) | Gyrodes expansa (44199 44200 44212) | |
| Coniacian | USA (California) | Gyrodes expansa (44232) | |
| Campanian | USA (California) | Gyrodes expansa (158389) | |
| Late/Upper Campanian | USA (California) | Gyrodes expansa (86794 185168 220906) | |
| Middle Campanian | USA (California) | Gyrodes expansa (185174 221105 221107) | |
| Early/Lower Maastrichtian | USA (California) | Gyrodes expansa (224893) |