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Murchisonia (Murchisonia) subulata
Taxonomy
Murchisonia (Murchisonia) subulata was named by Tyler (1965). Its type specimen is YPM 16480, a shell, and it is a 3D body fossil. Its type locality is river bed immediately downstream from the Four Mile Dam on Thunder Bay River, which is in a Givetian carbonate limestone in the Four Mile Dam Formation of Michigan.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1965 | Murchisonia (Murchisonia) subulata Tyler p. 347 figs. pl. 47 f. 32-33 |
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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 (Murchisonia) subulata Tyler 1965
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. H. Tyler 1965 | Shell small, holotype 12 mm. high and 5.6 mm. wide, moderately high-spired with spiral angle of about 25 degrees; whorl profile gently convex above periphery, becoming more strongly convex at periphery and below; nuclear portion unknown; sutures wide and shallow; base gently convex and anomphalus; aperture sub-round, tending to be elongate parallel with axis; selenizone bordered by threads and lying slightly below whorl periphery and in earlier whorls tending to be more strongly raised than in later whorls, a feature perhaps due to differential wear; lunulae present in selenizone as faint, curved threads; ornamentation above selenizone consisting of rather strongly pronounced, steeply prosocline threads; below selenizone, collabral threads less strongly pronounced and markedly opisthocline. |
Measurements
No measurements are available
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| Source: g = genus, o = order | |||||
| References: Bambach et al. 2007, Hendy 2009 | |||||