Two-armed Neptunian

The two-armed Neptunian is a who strangely enough only has two arms, instead of four as most Neptunians have. He was only seen briefly, haggling with the number-nine man in Little Neptune.

Production
The two-armed Neptunian only having two arms is probably a goof and not deliberate, seeing as he only appears in the background. It's also possible he is not a Neptunian (or he is a sub-species).