Aparo in the 30th Century!

Here's an interesting cover with Jim Aparo art that's easily overlooked: Legion of Super-Heroes #300. Easily overlooked because it's a "jam cover": different artists contributed different characters to the picture. Aparo was a curious choice to participate, since he couldn't really be considered one of the classic Legion artists; he had illustrated two earlier covers for the series, and he was probably assigned those only because DC didn't have a job ready for him when he showed up in the New York offices on a particular day.
But which character did he draw on this cover? Can you spot the Aparo figure? Here's a hint: it's a character he had drawn for a different series just a month earlier!