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Euagnostus
Taxonomy
Euagnostus was named by Whitehouse (1936) [Sepkoski's age data: Cm mMid-u Cm uMid-m Sepkoski's reference number: 16,1066]. It is not extant.
It was assigned to Agnostida by Sepkoski (2002); and to Doryagnostidae by Naimark and Pegel (2017).
It was assigned to Agnostida by Sepkoski (2002); and to Doryagnostidae by Naimark and Pegel (2017).
Synonymy list
Year | Name and author |
---|---|
1936 | Euagnostus Whitehouse |
2002 | Euagnostus Sepkoski |
2017 | Euagnostus Naimark and Pegel p. 1207 |
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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.
Diagnosis
Reference | Diagnosis | |
---|---|---|
E. B. Naimark and T. V. Pegel 2017 | Cephalon semiovate to subquadrate, with narrow border structures; glabella bipartite, with rounded anteroglabella partly or almost fully effaced; basal lobes small to moderate. Pygidium subquadrate, with narrow or moderate border structures, minutely bispinose; axis conical or with parallel sides, posteroaxis not expanded; F1, F2 as very short lateral grooves, posteroaxis not reaching border furrow; postaxial furrow usually present, but may be effaced in large holaspids. |