Two-armed Neptunian

The two-armed Neptunian is a Neptunian 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)