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Itagnostus
Taxonomy
Itagnostus was named by Opik (1979) [Sepkoski's age data: Cm mMid-u]. It is not extant.
It was synonymized subjectively with Peronopsis by Robison (1988) and Jell and Adrain (2002).
It was assigned to Agnostida by Sepkoski (2002); and to Peronopsidae by Naimark and Pegel (2017) and Lerosey-Aubril et al. (2020).
It was synonymized subjectively with Peronopsis by Robison (1988) and Jell and Adrain (2002).
It was assigned to Agnostida by Sepkoski (2002); and to Peronopsidae by Naimark and Pegel (2017) and Lerosey-Aubril et al. (2020).
Species
Synonymy list
Year | Name and author |
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1979 | Itagnostus Opik |
2002 | Itagnostus Sepkoski |
2017 | Itagnostus Naimark and Pegel pp. 1191 - 1192 |
2020 | Itagnostus Lerosey-Aubril et al. p. 525 |
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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. †Itagnostus Opik 1979
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†Itagnostus gaspensis Rasetti 1948
†Itagnostus interstrictus White 1874
†Itagnostus oepiki Laurie 2004
Diagnosis
Reference | Diagnosis | |
---|---|---|
E. B. Naimark and T. V. Pegel 2017 | Cephalon with narrow border structures, glabella bipartite, F3 straight, F2 as short notches on sides, basal lobes small. Pygidial border moderately wide, tending to flatten, with tiny spines, border furrow moderately wide; postaxial furrow present, F1 and F2 as short notches, posteroaxial depression undeveloped, axis constricted across M2, M1 wider than M2, pygidial median node of moderate size. |