The io9 Guide to Super Sentai io9.gizmodo.com

The current team, Doubutsu Sentai Zyuohger, is the 40th Super Sentai incarnation, and began airing in Japan in February of this year.
Dengekitai, the term “Super Sentai” didn’t exist—they were just known as “Sentai” shows.
Although they were techincally only “Sentai” rather than “Super Sentai,” Toei retroactively added Gorenger and J.A.K.Q.
Last year, Shout Factory announced that it had attained home release rights for Kyoryu Sentai Zyuranger and the two Sentai shows that followed it, Gosei Sentai Dairanger and Ninja Sentai Kakuranger, the Super Sentai shows that provided footage for the first few seasons of Mighty Morphin’ Power Rangers.
This makes them the first-ever officially available Super Sentai shows in the US.