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Eukrinaster ibexensis
Taxonomy
Eukrinaster ibexensis was named by Blake et al. (2007). Its type specimen is Holotype TMM 1965TX10 and is a 3D body fossil. Its type locality is Square Top Section, 15 meters above base of formation., which is in a Blackhillsian carbonate limestone in the Wah Wah Formation of Utah. It is the type species of Eukrinaster.
Synonymy list
| Year | Name and author |
|---|---|
| 2007 | Eukrinaster ibexensis Blake et al. pp. 1261-1264 figs. fig. 1–3, 4.1–4.5, 4.7–4.9, 5.3 |
| 2018 | Eukrinaster ibexensis Blake p. 27 |
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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.
†Eukrinaster ibexensis Blake et al. 2007
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. B. Blake et al. 2007 | Dense dermal?-granular layer investing all primary ossicles except ambulacrals, including portions of adambulacrals and mouth-angle ossicles. One large, paddle-shaped
spine on each adambulacral; dermal?-granular layer suggests no further adambulacral spines present. No MAO spines recognized. Ambulacral ossicles buttressed by upright ridge on nose of adambulacrals; ambulacral-adambulacral contact ridge robust. Adambulacrals extend adradially into interior. Proximal adambulacrals very wide, braced internally by actinals; adambulacral series narrowed distally. Marginals in double series, little enlarged relative to adjacent ossicles. Arm marginals approximately equidimensional and offset, their lateral margins nearly abutted; interbrachial marginals similar but slightly smaller, overlapping. Probable non-apomorphic characters aiding in recognition include overall body form with presence of an abactinal skeleton of uniform, densely arranged paxilliform granules; carinal abactinal series and primary circlet apparently lacking. Actinals numerous, irregular in arrangement. Axillary, if present, only weakly differentiated. Dorsal surface of ambulacrals rounded. Torus, buccal slit both present. |
Measurements
No measurements are available
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| Source: c = class, p = phylum | |||||
| References: Aberhan et al. 2004, Aberhan 1992 | |||||
Age range: Blackhillsian or 474.90000 to 470.00000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Blackhillsian | USA (Utah) | Eukrinaster ibexensis (type locality: 174456 174457 174458) | |
| Blackhillsian | USA (Nevada) | Eukrinaster ibexensis (174459) |