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That's pretty straightforward. Pick a subtype which allows a quadruped base form and which isn't especially nice (aberrant, daemon or demon) and multiple claws/bite/acid dripping from them (energy attacks:acid) are easy. An acid breath weapon is possible but not worth the 3 evolution points. You'll want to get pounce when you can afford 3 EP though.
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Yeah, I'd suggest aberrant, and carnifex rather than mawloc (those are clearly serpentine, but that base form has worse stats for what you seem to be looking for giving them a bunch of limbs is very inefficient). Tyranid are technically closer to bipedal, but I agree quadruped is near enough and is more efficient. Until you have enough evolution points and natural attacks allowed its second set of arms can be vestigial. At 1st level it would just be:
Abberrant, quadrapedal shape
default evolutions, claws. That gives you three primary natural attacks, and will get you started.
By 9th level it's really taken shape. It's got immunity to mind-affecting, which works with the hivemind thing tyranid have (though I don't know if there's any relevant lore or just the appearance you want), and 8 evolution points without extra evolution feats.
Those could be:
default evolutions, claws, limbs [arms], claws again (bringing it to the max 5 natural attacks and giving it the classic tyranid four armed functionality + bite) energy attacks [acid], and leaves you with 2 evolution points to spend on whatever you think fits best - rend, poison, ability increase, scent, skilled [stealth], natural armor, and the ability to increase that to four spare points by taking extra evolution twice.
You could spend that on pounce (with a point left over), breath weapon (which is awful but worth wasting the points for noxious bite), or large size.
Quadrupeds start with 14 Str, 14 Dex, bipeds with 16 Str, 12 Dex. If you go with aberrant then a biped gets a slam attack and no claws or bite, so you need to buy both (2 EP) to get to a claw/claw/bite attack routine. Quadruped abberants only need 1 EP to do so; more efficient. Biped daemons and demons could also get there with 1 EP because they start with claws but those might not be as good a match on flavour.
If you want to go with a biped that means you won't be getting pounce ever. Pounce is good. The +2 Str is an advantage to bipeds, certainly.
One suggestion; if your concept could be a half-elf or a vanara summoner, those get the option of taking +1/4 evolution point as their favored class bonus, which is obviously nice to have for a concept focused on their eidolon.
Make sure you're reading the unchained eidolon and summoner details, not the original eidolon and summoner details. They're not the same and you said in the OP you were using unchained.
Edit: oh, the base form details - those get overwritten by the more specific info under (for example) the aberrant subtype.