| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Hybocrinus nitidus
Taxonomy
Hybocrinus nitidus was named by Sinclair (1945).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1945 | Hybocrinus nitidus Sinclair |
| 1982 | Hybocrinus nitidus Sprinkle pp. 121 - 127 figs. Plate 7, figures 1-18, 21-39; Plate 8, figures 1-4; Figure 40A-I |
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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.
†Hybocrinus nitidus Sinclair 1945
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Sprinkle 1982 | Cup moderately asymmetric, nearly circular in top view, L:W averaging 1.01, summit tilted to cup axis, tilt angle averaging 26'; BB differing greatly in size because stem facet offset toward A ray, RR differing slightly, anal X elongate, about two-thirds width of small adjacent C-ray radial; PO small with horseshoe-shaped hydropore in raised tubercle, PO not reaching RR but no large accessory 00 or anals observed, wide periproctal membrane around anal pyramid, few small ambulacral flooring plates present; plates with fine pustular ornament; arms relatively short, one to one and a half times cup length, differing slightly in diameter with A-ray arm largest; stem short, approximately equal to cup length, round with rounded star-shaped lumen, divided into pentameres centered directly below BB, terminating in small type 2 holdfast distally. |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, p = phylum | |||||
| References: Aberhan et al. 2004, Hendy et al. 2009, Kiessling 2004, Aberhan 1992 | |||||
Age range: Blackriveran or 457.30000 to 449.60000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Blackriveran | USA (Oklahoma) | Hybocrinus nitidus (23990) |