At least it's one point of view. The article suggests (tentatively) an evolutionary connection with crustaceans, however, due to most insects ephemeral nature, not many fossils records remain. Be careful when trying to pinpoint the time period in which insects first appeared as not even entomologists agree on this. Definitely a worthy field of study. As a fairly new species on the planet (when compared to the others) we could learn a lot from some of the most successful & enduring.