It lived during the Lower Cambrian (Atdabanian)[3] and species occurred on all paleocontinents except for the Gondwana heartland (currently Latin America, most of Africa, Australia, Antarctica, India and China).

In Laurentia the Fallotaspidoids were succeeded by Nevadioids, Judomioids and Olenelloids, the latter remaining the dominant group of trilobites until the extinction of all Olenellina at the very end of the Lower Cambrian, after which Redlichiina, Ptychopariida and Corynexochida took over.

[6] Bergström recognized within the family Daguinaspididae five subfamilies: the Daguinaspidinae and the Fallotaspidinae (including Andalusiana, and Bradyfallotaspis), together comprising the current ”Fallotaspidoidea”, in addition to the Nevadiinae, the Neltneriinae and the Callaviniinae.

Applying a strictly cladistic approach would call for including the ”Fallotaspidoidea” in the Redlichiina, and possibly raising the status of the remaining Olenellina to become an order (and be renamed to Olenellida).

Second to split away is the Daguinaspididae-family, which comprises the closely knit group of Choubertella, Daguinaspis and Wolynaspis, with Eofallotaspis slightly further removed, and near the basis a subgroup consisting of Profallotaspis and Pelmanaspis.

[1] Bradyfallotaspis fusa, Geraldinella corneiliana and Selindella gigantea, all have a long frontal glabellar lobe (L4), and eye ridges that contact only the posterior part of L4, and so these genera belong to the “Nevadioidea“.