|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Pseudosphaerexochus (Pseudosphaerexochus) hemicranium
Trilobita - Phacopida - Cheiruridae
It was recombined as Cheirurus (Pseudosphaerexochus) hemicranium by Schmidt (1881); it was recombined as Pseudosphaerexochus (Pseudosphaerexochus) hemicranium by Kielan-Jaworowska et al. (1991); it was recombined as Pseudosphaerexochus hemicranium by Owen and Bruton (1980), Owen (1981) and Jell and Adrain (2003).
|Year||Name and author|
|1881||Cheirurus (Pseudosphaerexochus) hemicranium Schmidt pp. 171 - 174 figs. pl. 10 f. 1-4; pl 16 f. 22-27|
|1980||Pseudosphaerexochus hemicranium Owen and Bruton|
|1981||Pseudosphaerexochus hemicranium Owen|
|1991||Pseudosphaerexochus (Pseudosphaerexochus) hemicranium Kielan-Jaworowska et al.|
|2003||Pseudosphaerexochus hemicranium Jell and Adrain p. 435|
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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.