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Praenucula dispar
Taxonomy
Nucula dispar was named by Barrande (1881). It is a 3D body fossil. Its type locality is Osek, which is in a Sarka offshore shale in the Sarka Formation of Czechia.
It was recombined as Praenucula dispar by Pfab (1934), Kříž and Steinová (2009).
It was recombined as Praenucula dispar by Pfab (1934), Kříž and Steinová (2009).
Sister species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1881 | Nucula dispar Barrande figs. pl. 273 f. VII/1-8, 13-16 |
| 1934 | Praenucula dispar Pfab pp. 235 -236 figs. pl. 1 f. 3c |
| 1934 | Praenucula dispar expansa Pfab p. 235 figs. pl. 1 f. 3d; pl. 3 f. 10-11, 15a-b |
| 1968 | Praenucula expansa McAlester pp. 46-47 figs. pl. 8 f. 3-9 |
| 2009 | Praenucula dispar Kříž and Steinová pp. 412 - 413 figs. 2, 3C, D, I, J |
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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.
†Praenucula dispar Barrande 1881
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Invalid names: Praenucula expansa Pfab 1934 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Kříž and M. Steinová 2009 | Praenucula with slightly elongated anterior part of the shell, with convex anterior part of the dorsal margin and with three pairs of rounded accessory muscle scars in the posterior part of the shell.
Shell small, equivalve, inequilateral, and broadly ovate. Anterior part of the shell is larger than the posterior part. Anterior and posterior margins evenly rounded, ventral margin convex. Umbones located in the posterior half of the shell, prosogyrate. Inner surface sculpture is smooth. Hinge taxodont, teeth row continuous in the umbonal region. Posterior part of the hinge is with the convex teeth (6–8 in number). In umbonal part the teeth are becaming smaller and toward the anterior slightly larger and of the orthomorph shape (according to Babin 1966, p. 39). In anterior part of the hinge are 5–6 teeth. Anterior and posterior adductor muscle scars rounded, posteriorly from the anterior adductor muscle scars one pair of the pedal muscle scars (protractors) and anteriorly from the posterior adductor muscle scars one pair of the rounded pedal muscle scars (retractors) are developed. Posteriorly from the umbo (but still in the umbonal region) three pairs of rounded accessory muscle scars are impressed (Fig. 2). Outer surface sculpture and the shell thickness are unknown. |
Measurements
No measurements are available
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| Source: g = genus, f = family, c = class | |||||
| References: Hendy 2009, Aberhan et al. 2004, Meyer et al. 2009 | |||||
Age range: base of the Oretanian to the top of the Hirnantian or 468.00000 to 443.10000 Ma
Collections (7 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Sarka | Czechia | Praenucula dispar (3857 232240) | |
| Sarka | Czechia (Plzeňský) | Nucula dispar (95016) | |
| Oretanian | Czechia | Praenucula dispar (229169) | |
| Vinice - Late/Upper Ordovician | Czechia | Praenucula dispar (3863) | |
| Zahorany - Late/Upper Ordovician | Czechia | Praenucula dispar (3865) | |
| Hirnantian | Czechia (Praha) | Praenucula dispar (149320) |