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Gratagnostus
Taxonomy
Gratagnostus was named by Khairullina (1975) [Sepkoski's age data: Cm uMid-l]. It is not extant. Its type is Gratagnostus latus.
It was assigned to Agnostida by Sepkoski (2002); and to Peronopsidae by Naimark (2012).
It was assigned to Agnostida by Sepkoski (2002); and to Peronopsidae by Naimark (2012).
Species
G. latus (type species)
Synonymy list
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. B. Naimark 2012 | Cephalon with convex border and deep border furrow, without preglabellar furrow; gla bella with two distinct and deep lateral furrows, poste rior part of posterior lobe rounded and narrowed due to large basal lobes; median node positioned near mid dle of posterior lobe; anterior lobe of glabella relatively small, semicircular, separated by straight or slightly posteriorly curved transglabellar furrow. Pygidium subquadrate, with spines on border, border convex, relatively narrow, border furrow widened; axis with parallel lateral sides or slightly constricted at second segment; transaxial furrows distinct, first or second furrow sometimes interrupted in central part near tubercle; tubercle elongated, occasionally beginning on anterior segment; posterior lobe narrowing gradually posteriorly, with transverse depression in middle or anterior part; transverse depression varying in length from long furrow to small pit. Postaxial space distinct or axis closely approaching border furrow, postaxial furrow absent. |