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Cyrtometopus clavifrons

Trilobita - Phacopida - Cheiruridae

Calymene clavifrons was named by Dalman (1827) [Calymene? clavifrons. ]. Its type specimen is RM Ar.17907, a cephalon/head, and it is a 3D body fossil.

It was recombined as Cyrtometopus clavifrons by Angelin (1854) and Hansen (2010).

Sister species lacking formal opinion data

Synonymy list
YearName and author
1827Calymene clavifrons Dalman p. 260
1854Cyrtometopus clavifrons Angelin pp. 32-33 figs. pl. XXI: 4; pl. XXXIX: 9, a (non pl. XXI: 4a)
2010Cyrtometopus clavifrons Hansen pp. 4 - 7 figs. 3, 7A-E

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EubilateriaAx 1987
phylumArthropodaLatreille 1829
subphylumArtiopoda(Hou and Bergstrom)
classTrilobitaWalch 1771
orderPhacopidaSalter 1864
suborderCheirurinaHarrington and Leanza 1957
familyCheiruridaeHawle and Corda 1847
genusCyrtometopusAngelin 1854
speciesclavifrons(Dalman 1827)

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.

Cyrtometopus clavifrons Dalman 1827
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T. Hansen 2010The cranidium is defined by the central location of the maximal width and height of glabella and by the genal spines, directed approximately 30° outwards relative to the symmetric axis (modified from Angelin (1854) and Schmidt (1881)).
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-movingc
Life habit: low-level epifaunalc
Diet: carnivoref
Vision: well-developedg
Created: 2010-01-13 03:56:54
Modified: 2010-01-13 05:56:54
Source: g = genus, f = family, c = class
References: Whittington et al. 1997, Hendy 2009, Aberhan et al. 2004

Age range: base of the Volkhov to the top of the Kunda or 471.10000 to 464.30000 Ma

Collections (26 total)

Time interval Ma Country or state Original ID and collection number
Volkhov471.1 - 469.2Russian Federation Cyrtometopus clavifrons (157086 157102 157103 157104 157105 157106 157107 157108 157109 157110 157111 157112 157113 157114 157117 157126 157141)
Kunda469.2 - 464.3Russian Federation Cyrtometopus clavifrons (157142 157143 157144)
Kunda469.2 - 464.3Sweden Cyrtometopus clavifrons (188210 188216 188217 188219 188222 188288)