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Lesueurilla prima
Taxonomy
Ophileta prima was named by Perner (1903) [Ophileta prima Barrande in Perner 1903]. It is a 3D body fossil.
It was recombined as Raphistoma (Lesuerella) primum by Perner (1907); it was recombined as Lesueurilla prima by Thoral (1935), Havlicek and Vanek (1966), Yochelson (1982), Yochelson (1984), Horný (1997), Ebbestad et al. (2016) and Wagner (2023).
It was recombined as Raphistoma (Lesuerella) primum by Perner (1907); it was recombined as Lesueurilla prima by Thoral (1935), Havlicek and Vanek (1966), Yochelson (1982), Yochelson (1984), Horný (1997), Ebbestad et al. (2016) and Wagner (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1903 | Ophileta prima Perner |
| 1907 | Raphistoma (Lesuerella) primum Perner pp. 156 - 158 figs. txt. f. 188; pl. 114 f. 18 |
| 1935 | Lesueurilla prima Thoral p. 145 figs. pl. 12 f. 1a-b, 2-3 |
| 1966 | Lesueurilla prima Havlicek and Vanek p. 51 |
| 1982 | Lesueurilla prima Yochelson p. 59 figs. pl. 3 f. 8-10 |
| 1984 | Lesueurilla prima Yochelson pp. 264 - 268 figs. f. 1a, ?1g |
| 1997 | Lesueurilla prima Horný pp. 53 - 54 figs. pl. 9 f. 10; pl. 10 f. 6-13 |
| 2016 | Lesueurilla prima Ebbestad et al. figs. 2A–H, 3A–D |
| 2023 | Lesueurilla prima Wagner p. 897 |
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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.
†Lesueurilla prima Perner 1903
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. O. R. Ebbestad et al. 2016 | Shell up to 2.5 cm wide with at least 4 whorls of even expansion rate. The shell is nearly planispiral but grows more up the axis of coiling than down, thus being slightly ultra-dextral. Base of internal mould evenly rounded (Fig. 2G) with the umbilical wall gently convex, sloping at an angle of 35° towards the base (Fig. 3C). Outer whorl gently convex, but raised more steeply from the base towards the peripheral band (Fig. 3C). In the early whorls the upper whorl surface is inclined steeply, but becoming less steep adaperturally during ontogeny as the aperture is rotated clockwise (Fig. 2A). Whorl width is about 80% of whorl height, with the long axis of the aperture inclined about 15° relative to the axis of coiling. A sharp basal ridge is formed when shell is preserved (Fig. 2H). Ornamentation on the umbilical wall and across the basal carina consists of evenly spaced, rugose growth lines, being sigmoidal across the base. The succeeding growth increments represented by each growth line are imbricated, being formed from underneath the adapertural end of the preceding growth increment; the rugosity is more marked on the basal and umbilical sides. The style of ornamentation on the base continues on the outer whorl but the rugosity is subdued, and the growth lines are gently prosocyrt. Similar ornamentation and style of subdued growth lines are developed on the upper surface, where they sweep abaperturally in an even and gentle curve. The peripheral band is not preserved. |
Measurements
No measurements are available
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| Source: g = genus, c = class | |||||
| References: Kiessling 2004, Wagner 2023 | |||||
Age range: base of the Fennian to the top of the Darriwilian or 470.70000 to 458.40000 Ma
Collections (20 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Arenig | Morocco | Lesueurilla prima (56612) | |
| Arenig | France (Montagne Noire) | Lesueurilla sp. (20828) | |
| Klabava | France (Montagne Noire) | Lesueurilla prima (20824) | |
| Floian | France (Montagne Noire) | Lesueurilla prima (20820) | |
| Floian | Morocco (Anti Atlas) | Lesueurilla prima (166726 166730 166731) | |
| Fennian | France (Montagne Noire) | Lesueurilla prima (20825 167654) | |
| Oretanian | Morocco | Lesueurilla prima (56176 56177 56178) | |
| Darriwilian | Iran | Lesueurilla prima (179207) | |
| Sarka | Czech Republic | Lesueurilla prima (95015) Raphistoma primum (95017) | |
| Sarka | Czech Republic (Plzeňský) | Lesueurilla prima (95016) | |
| Dobrotivian | France (Loire-Atlantique) | Lesueurilla prima (185521 185522 185524) Lesueurilla sp. (20889) |