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Taxonomy
Xenostegium euclides was named by Walcott (1925).
It was recombined as Kayseraspis euclides by Kobayashi (1955); it was recombined as Megistaspis (Ekeraspis) euclides by Jell and Stait (1985).
It was recombined as Kayseraspis euclides by Kobayashi (1955); it was recombined as Megistaspis (Ekeraspis) euclides by Jell and Stait (1985).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1925 | Xenostegium albertensis Walcott p. 125 figs. pl. 24, figs 10 , 11 |
| 1925 | Xenostegium euclides Walcott p. 126 figs. pl. 24, figs. 13, 14 |
| 1955 | Kayseraspis euclides Kobayashi p. 442 figs. pl. 4 f. 4-12; pl. 5 f. 8-10 |
| 1985 | Megistaspis (Ekeraspis) euclides Jell and Stait pp. 14 - 15 figs. Plate 7, figures 1-15 |
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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.
†Megistaspis (Ekeraspis) euclides Walcott 1925
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Invalid names: Megistaspis (Ekeraspis) albertensis Walcott 1925 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. A. Jell and B. Stait 1985 | Ekeraspid with very low convexity, axial furrow extremely poorly impressed; glabella with rounded anterior, vvaisted at level of palpebral lobes; palpebral lobes small, wide, semicircular, situated behind midlength of cranidium; facial suture diverging forward of palpebral lobes, eoneavc forward of palpebral lobe to widest point, sigmoidal behind palpebral lobe, meeting posterior margin at large angle, as it runs posteroaxially. Free cheek with long genal spine. Hypostome highly convex, with complete rounded posterior margin, with widest point near midlength. Pygidium subtriangular, with long terminal spine decreasing in length with growth; pleural and interpleural furrows weakly impressed on anterior segments. |
Measurements
No measurements are available
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| Source: g = genus, f = family, o = order, c = class | |||||
| References: Hendy et al. 2009, Aberhan et al. 2004, Hendy 2009 | |||||
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Lancefieldian | Australia (Tasmania) | Megistaspis euclides (165773) | |
| Stairsian - Tulean | Canada (British Columbia) | Kayseraspis euclides (50169) |