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Itagnostus

Agnostida - Peronopsidae

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).

Synonymy list
YearName and author
1979Itagnostus Opik
2002Itagnostus Sepkoski
2017Itagnostus Naimark and Pegel pp. 1191 - 1192
2020Itagnostus Lerosey-Aubril et al. p. 525

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
phylumArthropodaLatreille 1829
RankNameAuthor
subphylumArtiopoda(Hou and Bergstrom)
orderAgnostidaSalter 1864
suborderAgnostinaSalter 1864
superfamilyAgnostoideaM'Coy 1849
familyPeronopsidaeWestergard 1936
genusItagnostusOpik 1979

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 oepiki Laurie 2004
Diagnosis
ReferenceDiagnosis
E. B. Naimark and T. V. Pegel 2017Cephalon 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.