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Norilagnostus
Taxonomy
Norilagnostus was named by Pack (2005) [Pack in Varlamov et al., 2005, p. 43]. Its type is Pseudagnostus quadratus.
It was assigned to Quadrahomagnostinae by Varlamov et al. (2006); and to Pseudagnostidae by Naimark (2016).
It was assigned to Quadrahomagnostinae by Varlamov et al. (2006); and to Pseudagnostidae by Naimark (2016).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2005 | Norilagnostus Pack p. 43 |
| 2006 | Norilagnostus Varlamov et al. pp. S64-S65 |
| 2016 | Norilagnostus Naimark pp. 64 - 65 |
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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 | |
|---|---|---|
| A. I. Varlamov et al. 2006 | C moderately convex, broadening from base anteriorly. Anterior margin of C saddleshaped, with parts along axis curving backward and upward (in frontal view). Acrolobes compressed, subquadrate. Border furrow of C strongly broadened near anterolateral corners of C, narrowing toward axis and even more strongly narrowing toward posterolateral corners of C. Border weakly convex, flattened. Anteroglabella rhomboid, separated from posteroglabella by V-shaped F3 transglabellar furrow. Posterior margin of G angular, with small swelling or node at its very end. Basal lobes small, triangular. F2 furrow resembling transglabellar furrow on casts, whereas only its lateral parts expressed on exoskeleton. Median preglabellar furrow deep and broad on casts and smoothed out on exoskeleton. Genae noticeably narrowing at axis. Gena surface covered with radial striae and foveae distinct on casts and poorly expressed on exoskeleton. Pyg moderately convex, broadening backward, with weakly convex anterior margin and concave three-edged posterior margin. Acrolobes subtrapezoidal, compressed. Border relatively narrow and weakly convex. Border furrow shaped as surface bend, diffused. Axis weakly convex, constricted near M2 division, anterior margin of axis concave, posterior margin rounded angular; axis closely approaching border furrow. Posteroaxis weakly broadening backward, with large terminal node on its posterior end. Unclear longitudinal depression, probably relict of postaxial axial furrow, visible behind posteroaxis. Pleural fields narrowing toward posterior margin of Pyg, where they are separated by depression. Small backward directed, abaxially posterolateral spines developed near posterolateral corners of Pyg. Surface of Pyg with foveate-striated sculpture, weakly expressed on casts and barely visible on exoskeleton. | |
| E. B. Naimark 2016 | Pseudagnostids with subquadrate or suboval cephalon; pygidium and cephalon with wide border furrows; preglabellar furrow on cephalon usually effaced or partly developed adjacent to glabella, transglabellar furrow effaced or thin and Vshaped, lateral furrows absent; glabellar node small and located in middle of posterior glabellar node lobe. Pygidium with narrow axis outlined by axial furrows, which are complete or partly effaced around poster oaxis; additional bosses on posteroaxis absent, lanceolate field absent, terminal node usually large and may overhang border furrow; nonscrobiculate or weakly scrobiculate in exfoliated specimens. |
Measurements
No measurements are available
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| Source: f = family, o = order | |||||
| References: Hendy 2009, Kiessling 2004 | |||||
Age range: Taoyuanian or 498.50000 to 485.40000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Taoyuanian | Russian Federation (Krasnoyar) | N. quadratus (132545 132547 132590 132591) |