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Blairocrinus macurdai
Taxonomy
Blairocrinus macurdai was named by Rhenberg and Kammer (2013). It is not extant. Its type specimen is UMMP 74065, a calyx.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2013 | Blairocrinus macurdai Rhenberg and Kammer |
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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.
†Blairocrinus macurdai Rhenberg and Kammer 2013
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. C. Rhenberg and T. W. Kammer 2013 | Diagnosis.Arm lobes not protuberant; many medium-sized tegmen plates; tegmen plates spinose to nodose.
Description.Calyx small, low bowl. Arms moderately grouped. Calyx plates with multiple radiating ridges. Basal circlet 11 percent of calyx height. Basals small, three, equal in size. Radial circlet 40 percent of calyx height. Radials hexagonal, wider than high. Tegmen higher than calyx; conical. Tegmen composed of many medium to small spinose to nodose plates. Anal tube central to eccentric. Primanal hexagonal, smaller than radials, followed by 2,3,2,2 plates. Interrays in contact with tegmen. First interradial hexagonal, followed by two plates. First primibrachial hexagonal, wider than high. Second primibrachial axillary, supporting two arm facets each. Paratypes: UMMP 74066, UMMP 74067, and 13 more specimens |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum | |||||
| References: Aberhan 1992, Aberhan et al. 2004, Kiessling 2004 | |||||