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Phyrtosaster casteri
Taxonomy
Phyrtosaster casteri was named by Blake (2007). Its type specimen is CMC TT5305 and is a 3D body fossil. Its type locality is near Eastfork Lake, Clermont County, which is in a Cincinnatian marine mixed carbonate-siliciclastic in the Fairview Formation of Ohio. It is the type species of Phyrtosaster.
Synonymy list
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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.
†Phyrtosaster casteri Blake 2007
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. B. Blake 2007 | Proximal adambulacrals closely aligned across interbrachium, forming narrowed bar or ridge extended toward mouth. MAO pair prominent, broad, with ventral-proximal surface of MAO pair depressed, spoon-shaped. Actinals few in number; robust, angular, arrangement appearing to differ from arm to arm.
Non-diagnostic characters useful for identification include presence of marginals in single series; marginals robust, rectangular; ventral surfaces flattened, abradial margin angular, fascioles lacking. Axillary little enlarged, cuneate, barely reaching arm margin, adradial edge rounded. |
Measurements
No measurements are available
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| Source: f = family, c = class, p = phylum | |||||
| References: Aberhan 1992, Aberhan et al. 2004, Blake 1994 | |||||
Age range: Cincinnatian or 451.00000 to 443.10000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Cincinnatian | USA (Ohio) | Phyrtosaster casteri (type locality: 91152) |