That was me. You may also see gracken (generally non-hostile), krecks (hostile but comparatively weak), and amoebic molds (meh) about.
I put Nether critters around corpses for two reasons:
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To help answer the constant speculation about why the corpses are there. Maybe the Denizens killed 'em, maybe they’re just curious.
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In the case of the mi-go and (lesser extent) krecks, to put something that’s a decent challenge in the vicinity. Folks loved to complain about how corpses were Free Loot and Needed Nerfed, even after I’d made 'em have a chance to feature special zombies. Judging by this and other posts, they are adequately nerfed now. I guess I didn’t need to add flying polyps to the spawn list.
More generally, mapgen is random. Map “extras” like corpses are fairly rare. Within map extras, corpses are fairly commonplace. I don’t know if something got changed in translation to the Mac, and without seeing the character I can’t tell if there was some sort of miscalculation.
I don’t enjoy being steamrolled as I leave the shelter, though.