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Murchisonia (Donaldospira) pyramidata
Taxonomy
Murchisonia pyramidata was named by Donald (1887). It is a 3D body fossil.
It was recombined as Murchisonia (Donaldospira) pyramidata by Batten (1966).
It was recombined as Murchisonia (Donaldospira) pyramidata by Batten (1966).
Sister species lacking formal opinion data
Synonymy list
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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.
†Murchisonia (Donaldospira) pyramidata Donald 1887
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Donald 1887 | Shell elongated, whorls angular, gradually increasing. Only four whorls and a portion of a fifth are preserved; there would probably be ten or twelve if the shell were entire. There is a prominent rounded keel situated about two thirds down each whorl, which evidently represents the sinual band, though no lines of growth are preserved on it. These lines curve backwards to it above and slightly forward again below; they are fine and faint. The surface of the whorls both above and below the band is slightly concave, and the base is convex. The form of the mouth and colume]la is unknown, as the base is broken. The lower part of the whorl is covered with fine spiral threads, thus disposed :--immediately below the band is a deep groove, then a strong thread, three or four finer ones, another strong thread which is about midway between the band and the suture, below this there are two or three fine ones on the upper whorls, but they are more numerous on the base, which is covered with them. These spiral lines are slightly beaded; they are probably rendered so by the crossing of the lines of growth. Above the band there is a spiral thread about two thirds below the suture, and immediately below the suture there is another fine thread on the body-whorl, but it is not preserved on the other whorls. |
Measurements
No measurements are available
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| Source: c = class | |||||
| Reference: Kiessling 2004 | |||||
Collections
No collection or age range data are available