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Doryagnostus incertus
Taxonomy
Agnostus incertus was named by Brögger (1878).
It was recombined as Doryagnostus incertus by Robison (1978), Peng and Robison (2000).
It was recombined as Doryagnostus incertus by Robison (1978), Peng and Robison (2000).
Sister species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1878 | Agnostus incertus Brögger pp. 70-71 figs. pl. 6, figs. 4a, b |
| 1939 | Ceratagnostus magister Whitehouse pp. 256-257 figs. pl. 25, fig. 27 |
| 1978 | Doryagnostus incertus Robison p. 7 figs. Plate 2, figures I, 2, 8 |
| 2000 | Doryagnostus incertus Peng and Robison |
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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.
†Doryagnostus incertus Brögger 1878
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Invalid names: Doryagnostus magister Whitehouse 1939 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. A. Robison 1978 | Size relatively large; complete specimens range up to almost 17 mm in length. One large Australian specimen (Pl. 2, fig. 8) has a cephalic length and width of 7.1 by 8.2 mm and a pygidial length and width of 7.0 by 8.2 mm.
Cephalon subcircular to subquadrate; width about equal to or slightly greater than length. Glabella distinctly narrower than genae (at level of transaxial furrow); anterior lobe ogiviform, posterior lobe with weak median node situated centrally or slightly in front of midpoint. Genae usually smooth, rarely showing faint scrobiculae; divided by consistently well-developed preglabellar median furrow. Border furrow mostly narrow, and deltoid area poorly developed or absent. Border relatively narrow, but expands slightly in width from posterior to anterior. Thorax with tripartite (tr.) axial rings that lack spines. Weak median tubercle present on anterior segment. Pygidium subcircular to subquadrate; width equal to or slightly greater than length. Posterior axis (behind second segment) acutely pointed, with moderate to well-developed central depression and tiny secondary median node, and axial furrow with or without slight constriction opposite depression. Border furrow narrow. Border widens slightly toward posterior, of uniform width (sag. and exsag.) between border spines; backward how in posterior margin varies from strongly to broadly rounded. Poster°lateral border spines moderate to relatively large. |