I had always assumed that R' Yehoshua Ben Levi was an Amorah. However, we know he is quoted in the mishnah in Avos (Perek 6 Mishnah 2. Which is really a braisa, not a mishnah, but still a Tannaic ...
In Succah 28a, the Gemara tells us that Hillel the Elder had 80 students of whom Yochanan ben Zakai was the "least" and Yonason ben Uziel was the greatest. There, it says of Yonason ben Uziel that ...