Kyōryū Sentai Zyuranger (恐竜戦隊ジュウレンジャー, Kyōryū Sentai Jūrenjā?), translated into English as Dinosaur Squadron Zyuranger is a Japanese tokusatsu television series and the sixteenth entry in the long-running Super Sentai franchise of superhero programmes. Produced by Toei Company Ltd. and Bandai, it aired on TV Asahi from February 21, 1992 to February 12, 1993, with a total of 50 episodes. It was the first Sentai series to be adapted as an installment of the American Power Rangers series - footage from the program was extensively used for the first season of the American series Mighty Morphin Power Rangers. The title Toei gives this series for international distribution is Galaxy Rangers.

Despite the show's title, only two of the Zyurangers have true Dinosaurs as avatars (Tyrannosaurus and Triceratops), or three if you count the Dragon as a Dinosaur. The Pteranodon, a variety of pterosaur, is a reptile (at the time of the show, it was still considered a dinosaur), and the remaining Zyurangers are prehistoric mammals (Woolly Mammoth and Smilodon).

Source: Wikipedia