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Melanocyrillium hexodiadema
Taxonomy
Melanocyrillium hexodiadema was named by Bloeser (1985). Its type specimen is UCLA 58959, a test, and it is a 3D body fossil. Its type locality is Locality B, Nankoweap Butte, which is in a Tonian marine shale in the Kwagunt Formation of Arizona.
Synonymy list
| Year | Name and author |
|---|---|
| 1985 | Melanocyrillium hexodiadema Bloeser |
| 2003 | Melanocyrillium hexodiadema Porter et al. p. 412 |
| 2017 | Melanocyrillium hexodiadema Cohen et al. p. 699 |
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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.
†Melanocyrillium hexodiadema Bloeser 1985
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P.A. Cohen et al. 2017 | VSMs with a hexagonal apertural margin formed by six distinctive indentations distributed evenly around the aperture. Indentations extend toward the abo- ral pole approximately one-half to one-sixth the test length. Below the indentations, the test is rounded in cross-section. Between the indentations are six parallel longitudinal ridges. |
Measurements
No measurements are available
No ecological data are available
Age range: Tonian or 1000.00000 to 850.00000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Tonian | USA (Arizona) | Melanocyrillium hexodiadema (227609 type locality: 227610 227611) | |
| Neoproterozoic | USA (Arizona) | Melanocyrillium hexodiadema (230323) | |
| Neoproterozoic | Canada (Yukon) | Melanocyrillium hexodiadema (230320) |