|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Trilobita - Agnostida - Ptychagnostidae
It was recombined as Ptychagnostus praecurrens by Robison (1982); it was recombined as Pentagnostus praecurrens by Laurie (2004).
|Year||Name and author|
|1936||Agnostus gibbus praecurrens Westergard|
|1982||Ptychagnostus praecurrens Robison|
|2004||Pentagnostus praecurrens Laurie|
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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.