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Bimuria buttsi
Taxonomy
Bimuria buttsi was named by Cooper (1956). Its type specimen is USNM 110934a, a shell, and it is a 3D body fossil. Its type locality is 0.5 miles northeast of Pelham, Bessemer Iron District, which is in an Ashbyan carbonate limestone in the Little Oak Formation of Alabama.
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Bimuria buttsi Cooper pp. 765 - 766 figs. Plate 212B, figures 11-31 |
| 1962 | Bimuria buttsi Williams pp. 174 - 175 figs. P1. XVI, figs. 29-37 |
| 2014 | Bimuria buttsi Candela and Harper pp. Supplement 1p |
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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.
†Bimuria buttsi Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell of about medium size for the genus, slightly wider than long ; hinge less than the greatest width which is at the middle of old adults. Lateral margins gently convex; anterior margin broadly to narrowly rounded. Umbonal region of both valves usually smooth, remainder of surface covered by concentric lamellae.
Pedicle valve moderately convex in lateral and anterior profiles. Umbo swollen. Anteriorly from the umbo a distinct but low fold is developed which extends to the anterior margin and produces a shallow sulcus there. Lateral slopes moderately steep ; posterolateral slopes abrupt and steep. Interarea strongly curved, anacline. Brachial valve strongly concave with the greatest depth in the midregion; anterior portion sulcate; flanks bounding sulcus gently concave. Umbonal region deeply concave; interarea strongly hypercline. Pedicle interior with small teeth, vascula media well impressed in adults ; other pallial marks less distinct. Inside the brachial valve lateral and median septa well developed ; adductors located on callosities, and fairly well impressed. | |
| A. Williams 1962 | Moderately concavo-convex Bimuria with the pedicle valve less than one-half as deep as long, subcircular to suboval in ventral outline and consistently wider than long, anterior commissure rectimarginate in young forms but more commonly sulcate in adult specimens; surface of both valves ornamented by differentially spaced lamellae (comae) forming concentric bands originating at about 4 mm. from the ventral umbo; dorsal interior with a strongly developed, unmodified median septum and a pair of submedian septa not extending to the anterior margin; outer ridges to the lophophore and muscle apparatus ill defined. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Aberhan et al. 2004, Hendy 2009 | |||||
Age range: base of the Abereiddian to the top of the Costonian or 468.00000 to 457.20000 Ma
Collections (7 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Abereiddian | United Kingdom (Scotland) | Bimuria buttsi (164926) | |
| Llandeilo | United Kingdom (Scotland) | Bimuria buttsi (164928 164931 164937 164941) | |
| Costonian | United Kingdom (Scotland) | Bimuria buttsi (76076) | |
| Ashbyan | USA (Alabama) | Bimuria buttsi (type locality: 164883) |