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Ptygmactrum spiculatum
Taxonomy
Ptygmactrum spiculatum was named by Cooper and Grant (1976). Its type specimen is USNM 152682a, a shell (Articulated shell), and it is not a trace fossil. Its type locality is USNM706b, Hess Canyon, Glass Mtns., which is in a Wordian offshore shelf packstone/wackestone in the Word Formation of Texas.
Synonymy list
Year | Name and author |
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1976 | Ptygmactrum spiculatum Cooper and Grant p. 1943 figs. Pl 505, figs 26-30 |
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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.
†Ptygmactrum spiculatum Cooper and Grant 1976
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Diagnosis
No diagnoses are available
Measurements
part | N | mean | minimum | maximum | median | s.d. | |
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shell height | 2 | 1.50 | 1.50 | 1.50 | 1.50 | - |
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Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
References: Aberhan et al. 2004, Nesnidal et al. 2013 |