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Quadragnostus
Taxonomy
Quadragnostus was named by Howell (1935) [Sepkoski's age data: Cm uMid].
It was synonymized subjectively with Peronopsis by Palmer (1954); it was synonymized subjectively with Diplorrhina by Jell and Adrain (2002).
It was assigned to Agnostida by Sepkoski (2002); and to Peronopsidae by Naimark and Pegel (2017).
It was synonymized subjectively with Peronopsis by Palmer (1954); it was synonymized subjectively with Diplorrhina by Jell and Adrain (2002).
It was assigned to Agnostida by Sepkoski (2002); and to Peronopsidae by Naimark and Pegel (2017).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1935 | Quadragnostus Howell p. 219 |
| 2002 | Quadragnostus Sepkoski |
| 2017 | Quadragnostus Naimark and Pegel p. 1194 |
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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. †Quadragnostus Howell 1935
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†Quadragnostus clarus Pokrovskaya and Egorova 1982
†Quadragnostus depressa Westergård 1946
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. B. Naimark and T. V. Pegel 2017 | Cephalon subquadrate, border structures narrow to moderate, posteroglabella with parallel sides or slightly expanded at rounded rear, anteroglabella semicircular, transglabellar F3 bent backward. Pygidium subquadrate, border structures narrow to moderate, bispinose, axis narrow, angulated in rear, median node small, posteroaxis with transverse depression, postaxial space very short, variable in having postaxial furrow. |