[1] The order Strabopida contains three valid genera and one doubtful, Khankaspis, Paleomerus, Parapaleomerus and Strabops, all assigned in the family Strabopidae.

[2] Previously, it also contained the genera Caryon, Lemoneites and Neostrabops, but after a study, they were reassigned as a trilobite, a glyptocystitid echinoderm and a cheloniellid arthropod, respectively.

[3] Although often suggested to be closely related to aglaspidids due to their similar morphology, their exact phylogenetic placement is uncertain due to the poor preservation of all known strabopids.

A 2013 attempt to place them in a phylogenetic analysis recovered them as part of a polytomy with megacheirans, marrellomorphs, crustaceans and artiopodans.

[3] In fact, Dunlop & Selden (1998) defined Paleomerus as "perhaps the best model of a primitive arachnomorph".