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Arbacia abiquaensis
Taxonomy
Arbacia abiquaensis was named by Linder et al. (1988). Its type specimen is UCMP 39188, a test, and it is not a trace fossil. Its type locality is Butte Creek [Abiqua Mbr, Scotts Mills Fm], which is in a Chattian shallow subtidal limestone in the Scotts Mills Formation of Oregon.
Synonymy list
| Year | Name and author |
|---|---|
| 1988 | Arbacia abiquaensis Linder et al. p. 948 figs. figs. 3.1-3.6 |
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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.
†Arbacia abiquaensis Linder et al. 1988
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. A. Linder et al. 1988 | Test small, sculptured, low hemispherical, flat- tened adorally; ambulacra with trigeminate plates; pore zones straight and narrow above ambitus; tubercles absent adapically above the ambitus; conspicuous epistromal verrucose warts and short semi-radial ridges both continuous and discontinuous across intraplate boundaries adapically/adorally; peristome width 48 percent of test diameter; dicyclic; adoralmost primary in- terambulacral tubercles noncrenulate. |