|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Trilobita - Ptychopariida - Isocolidae
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.
|J. A. Weir 1959||Isocolidae with a single pair of pit-like lateral glabellar furrows confluent with occipital furrow; lateral border furrows conf1uent with preglabellar furrow; facial sutures situated on lateral border.|