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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)).