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Hadrocephalites
Taxonomy
Hadrocephalites was named by Sundberg and McCollum (2002). Its type is Hadrocephalites lyndonensis.
It was assigned to Ptychopariidae by Jell and Adrain (2002); and to Ptychopariacea by Sundberg and McCollum (2002).
It was assigned to Ptychopariidae by Jell and Adrain (2002); and to Ptychopariacea by Sundberg and McCollum (2002).
Species
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1938 | Schistometopus Resser p. 10 |
| 1979 | Schistometopus Palmer and Halley p. 115 |
| 2002 | Hadrocephalites Jell and Adrain p. 381 |
| 2002 | Schistometopus Jell and Adrain p. 442 |
| 2002 | Schistometopus Sepkoski |
| 2002 | Hadrocephalites Sundberg and McCollum pp. 86 - 87 |
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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.
G. †Hadrocephalites Sundberg and McCollum 2002
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†Hadrocephalites carina Walcott 1917
†Hadrocephalites cecinna Walcott 1917
†Hadrocephalites convexus Rasetti 1951
†Hadrocephalites lyndonensis Sundberg and McCollum 2002
†Hadrocephalites rhytidodes Sundberg and McCollum 2002
Invalid names: Schistometopus Resser 1938 [nomen dubium]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. A. Sundberg and L. B. McCollum 2002 | Cranidium with glabella elongated, strongly con vex, and deep axial furrows; preglabellar field short or absent; and anterior border straight or slightly curved. Pygidium trans versely elongate, subrectangular, posterior border nearly straight, wide; long, relatively narrow-based pygidial spines; wide posterior border; strong pleural bands, postaxial notch absent. |