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Megistaspis (Ekeraspis) euclides

Artiopoda - Asaphida - Asaphidae

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).

Sister species lacking formal opinion data
M. gibba, M. filacovi, M. aliena, M. gibba

Synonyms
Synonymy list
YearName and author
1925Xenostegium albertensis Walcott p. 125 figs. pl. 24, figs 10 , 11
1925Xenostegium euclides Walcott p. 126 figs. pl. 24, figs. 13, 14
1955Kayseraspis euclides Kobayashi p. 442 figs. pl. 4 f. 4-12; pl. 5 f. 8-10
1985Megistaspis (Ekeraspis) euclides Jell and Stait pp. 14 - 15 figs. Plate 7, figures 1-15

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—EcdysozoaAguinaldo et al. 1997
—Panarthropoda
phylumArthropodaGravenhorst 1843
classArtiopodaHou and Bergstrom
RankNameAuthor
classTrilobitaWalch 1771
subclassLibristoma
orderAsaphidaSalter 1864
superfamilyAsaphoideaSalter 1864
familyAsaphidaeBurmeister 1843
genusMegistaspis(Tjernvik 1956)
subgenusEkeraspis
specieseuclides(Walcott 1925)

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.

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Invalid names: Megistaspis (Ekeraspis) albertensis Walcott 1925 [synonym]
Diagnosis
ReferenceDiagnosis
P. A. Jell and B. Stait 1985Ekeraspid 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
Composition: low Mg calcitec
Composition 2: chitinc
Entire body: yesf
Adult length: 10 to < 100f
Adult width: 10 to < 100f
Ontogeny: molting, addition of partsc
Environment: marinec
Locomotion: fast-movingo
Life habit: low-level epifaunalo
Diet: carnivorec
Vision: well-developedf
Created: 2009-06-11 14:38:06
Modified: 2009-12-14 00:45:08
Source: f = family, o = order, c = class
References: Hendy et al. 2009, Hendy 2009, Aberhan et al. 2004

Age range: base of the Stairsian to the top of the Tulean or 483.40000 to 475.30000 Ma

Collections (2 total)


Time interval Ma Country or state Original ID and collection number
Lancefieldian484.3 - 474.9Australia (Tasmania) Megistaspis euclides (165773)
Stairsian - Tulean483.4 - 475.3Canada (British Columbia) Kayseraspis euclides (50169)