I'm not sure what the term would be, confirmation bias? That humans tend to think of things that do similar things to us would look and act like us. A recent study showed I think it was crows that were at or near an intelligence level to chimpanzees and they do not have two hands similarly cephalopods and octopus's (octopi?) in particular have exceptional problem solving abilities and they're about as far from a bipedal humanoid form as you can get. While its true being bipedal frees up the hands to work with tools etc and chimpanzee hands are a compromise because they have to use them to walk as well I'm not wholly convinced thats a reason why we're smarter than they are.
Confirmation bias happens in other things as well before space probes reached the planets we saw everything in terms of how we saw the earth and moon system it was believed that Mars may have vegetation that ebbed and flowed with the seasons and Venus had oceans of liquid water. Albeit carbonnated due to C02 so oceans there were composed of fizzy pop! When actual probes reached those places it was profound shock and likewise the moons of the outer planets where assumed to be like our moon rocky and cratered and while some are indeed cratered they exist in astoninishingly varied forms like Europa which is composed entirely of ice and is as smooth as a billiard ball. Same thing with extraterrestrial star systems and planets it was assumed they'd all be like our solar system with a regular set of ordered planets, how wrong we were.
n.b. bilateral symmetry would say that tripods are extremely unlikely its why we have two hands, arms, legs, ears, lungs, kidneys... and eyes which did not evolve for depth perception thats an adaptation
en.wikipedia.org
