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In ancient Mesopotamian mythology, Humbaba was an evil giant slain by the hero Gilgamesh in the famous Epic of Gilgamesh. In the epic, there was only one Humbaba, but for the purposes of this question let's imagine there's a viable population like any other species.

Accounts of his appearance differ depending on the translation of the poem, but I'm going to with the one described in George Burckhart's one.

(Picture potentially NSFW)

enter image description here

In it, Humbaba is described as having:

  • A face like coiled intestines
  • Paws for hands
  • Thorny scales
  • tail and phallus ending in a snake's head
  • horns like a bull's
  • clawed feet

Just like any giant, he is much taller than a standard man and has an overall humanoid body plan.

How could this organism plausibly evolve said features, and what would it descend from?

I don't mind if some of the more minor features are omitted, such as the paws, which are hard to justify in a bipedal animal.

Anatomically correct series

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    $\begingroup$ It is hard to see any successful path that leads to a non-functional phallus given its importance in reproduction. $\endgroup$ – Gary Walker Nov 30 '18 at 20:00
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    $\begingroup$ @GaryWalker Who says it's non-functional? $\endgroup$ – Logan R. Kearsley Nov 30 '18 at 20:06
  • $\begingroup$ @GaryWalker It needn't be non functional, it could just have a secondary purpose, like display or mimicry. $\endgroup$ – SealBoi Nov 30 '18 at 20:06
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I won't suggest a single ancestor but just point out that real-life animals can have strange appendages.If such things can evolve separately then by fluke they could all evolve on a single creature.

Snake Like Penis

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Twin Penis

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Weird face

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Thorny scales

enter image description here

I have to go so I'll add links tomorrow.

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Humababa is a bipedal reptile in symbiotic relationship with snakes. Or maybe the piped is the female, and snakes attached to its body are males.

In either case, snakes provide venom attacks, 360 vision, and ability to attack smaller & faster animals. In return, they get to eat leftovers from pidped's kills, and get warmth as its larger body stores heat better, and allows it to even generate it internally (some dinosaurs could do that).

Horns, scales and claws are common in reptiles. Snakes can attach to these scales. They prefer to be around the head for better vision and access to food, but some are relegated to lower body (and were mistaken for penis and tail by scared humans).

If biped is the female, then males fight for the right to be on the biped's crotch, as it enables them to mate with the female. Head-based snakes are younger males, or older ones resting between mating attempts.

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    $\begingroup$ Wait, so less a symbiotic relationship between snake and biped and more extreme sexual dimorphism akin to an angler fish?? $\endgroup$ – Joe Bloggs Nov 30 '18 at 20:59
  • $\begingroup$ While this kind of sexual dimorphism is a really cool idea and would make for a great alien species, the question asked is about what it would evolve from which makes me think the question is more about how this could "theoretically" happen on Earth. Since reptiles tend to have very little sexual dimorphism, a symbiotic relationship seems much more plausible. $\endgroup$ – Nosajimiki Nov 30 '18 at 21:18
  • $\begingroup$ Perhaps the young are kept in pouches near the mouth a little like a catfish holding eggs in its mouth. I'm guessing it might evolve on a planet with a radical orbital swing so they need to take advantage of every mate they can get for as long as they can, so sometimes they double up and the young have to be kept near the mother for warmth and protection. Perhaps they get to bore into large prey once mature enough and get buried with it to rise mature in spring. $\endgroup$ – Joe Smith Dec 3 '18 at 6:09
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If you assume the Phallus and tail are purely mimicry, I'd go with descended from dinosaurs. If the kosmoceratops were to continue to evolve to have it's faceplate curl over it could have over time created the two "bull horns" and wreathed the face in a bone plate that would resemble "coiled intestines". Paws for hands, claws for feet, thorny scales, and large size are all easy aspect of dinosaur ancestry. The bipedal nature and snake-like appendages would have been specifically evolved features, but again, the fact you are taking a species that would have continued to exist in isolation for millions of years, makes it pretty easy to justify.

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This species does not use penetrative sex for reproduction.

Phallus and tail are actually two tentacles, one of which the male uses to deposit the spermatic bag into the cochlea of the mating female.

They come in pair because the second one, not used for mating purposes, it just serves the scope of displaying the fitness of the male.

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the region has a concentration of raw plutonium under the mountain. This is why the region is thought to be cursed. Because all the creatures who live there are somehow deformed and strange. This is really because the radiation has affected their genetic structure. Somehow the creatures have become capable of cross breeding and the new species has taken certain traits from each of the creatures.

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  • $\begingroup$ This unfortunately does not answer my question, since it has the science-based tag and thus excludes magic. $\endgroup$ – SealBoi Dec 1 '18 at 18:03
  • $\begingroup$ Revised with science $\endgroup$ – Robus Dec 1 '18 at 18:17

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