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Floyda concentrica
Taxonomy
Floyda concentrica was named by Webster (1905). It is a 3D body fossil. It is the type species of Floyda.
It was recombined as Floydia concentrica by Fenton and Fenton (1924); it was synonymized subjectively with Floyda gigantea by Day (1987).
It was recombined as Floydia concentrica by Fenton and Fenton (1924); it was synonymized subjectively with Floyda gigantea by Day (1987).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1873 | Naticopsis gigantea Hall and Whitfield pp. 238 - 239 figs. pl. 12 f. 8-10 |
| 1905 | Floyda concentrica Webster pp. 39 - 40 |
| 1905 | Naticopsis magnifica Webster pp. 58 |
| 1906 | Naticopsis gigantea depressa Webster p. 3 |
| 1909 | Naticopsis gigantea Kindle p. 35 |
| 1909 | Naticopsis gigantea Webster p. 45 figs. pl. 9 f. 1-11 |
| 1918 | Naticopsis gigantea Fenton p. 222 figs. pl. 7 f. 1-3 |
| 1918 | Floyda concentrica multisinuata Fenton p. 223 figs. pl. 7 f. 4 |
| 1924 | Floydia gigantea Fenton and Fenton pp. 182 - 183 figs. pl. 34 f. 5; pl. 35 f. 1-10; pl. 36 f. 1 |
| 1924 | Floydia concentrica Fenton and Fenton pp. 184 - 185 figs. pl. 34 f. 6; pl. 37 f. 4-9; pl. 43 f. 1- |
| 1924 | Floyda concentrica multisinuata Fenton and Fenton p. 186 figs. pl. 34 f. 7; pl. 38 f. 15 |
| 1963 | Platyceras (Platyostoma) gigantea Bass and Northrop p. J22 |
| 1987 | Floyda gigantea Day pp. 969 – 970 figs. 7, 8.1-8.5 |
| 2023 | Floyda concentrica Wagner p. S3737 |
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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.
†Floyda concentrica Webster 1905
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Invalid names: Floyda gigantea Hall and Whitfield 1873 [replaced], Floydia magnifica Webster 1905 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Day 1987 (Floyda gigantea) | Characteristically large, thick, holostomatous, anomphalous, and turbiniform; conspiral and dextrally coiled; sutures impressed. Whorl profile rounded on upper half and subangular at base of body whorl. Aperture subcircular and operculate (Figure 8.1, 8.2). Ornament of prosocyrt collabral growth and often well-developed disturbance lines, with or without strong opisthocline to orthocline collabral ridges on upper half of whorls of teleoconch. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Bambach et al. 2007, Kiessling 2004 | |||||
Age range: base of the Frasnian to the top of the Late/Upper Famennian or 382.31000 to 358.86000 Ma
Collections (10 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Frasnian | USA (Iowa) | Floyda concentrica (3407) Floyda gigantea (3403 3405 56253 56254) Floydia gigantea (56362) | |
| Late/Upper Famennian | USA (Colorado) | Naticopsis gigantea (644) Platyceras gigantea (3625 3664 3665) |