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Mandibles: For when normal jaws just won't get the job done.

mandible
noun
1. the jaw or a jawbone, especially the lower jawbone in mammals and fishes.
2. one of a pair of mouthparts of an arthropod, designed for holding food.
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As Most Writers Are Human, we're typically most accustomed to dealing with other humans, or at least other vertebrates, and thus anything that deviates too much from that template falls into the Uncanny Valley. Even with animals we're used to seeing a two-part, one-on-top-of-the-other jaw system on everything from whales to dogs to birds.note  So adding, say, arthropod-style mouthparts to the jaw system we're used to, or even replacing it entirely, is a quick and easy way to make something seem strange and other.

Monstrous Mandibles in fiction are typically found in four types.

  1. Decorative: This is a simple decorative addition, little more than tertiary nubs or tusks. Expect to see these mainly on Rubber-Forehead Aliens, though artificial designs to helmets and masks to resemble such an appearance also count.
  2. Functional: This is the functional addition. Whether they're little more than a tooth on a joint or a fully articulated limbs, these are mandibles that can actually do something.
  3. Bifurcated: This is the bifurcated jaw. Almost exclusively seen with the lower jaw, this has the existing jaw system fused with the monstrous set up, such that the jaws (or at least lower jaw) actually split in half.
  4. Replacement: This is total replacement, where Monstrous Mandibles are the only mouth parts. These are the default in Insectoid Aliens and more commonly found on particularly strange creatures.
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For creatures where these are almost universal, see Insectoid Aliens, Big Creepy-Crawlies, and Predator Pastiche. See also Lamprey Mouth, Overly Long Tongue, and More Teeth than the Osmond Family for other monstrous facial features. Very closely related to Flower Mouth, wherein several jaws ring the throat in defiance of the typical maxilla-mandible setup, a situation which closely resembles multiple sets of jaws.


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Examples:

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    Anime & Manga 
  • In Berserk, Rosine's "children" are tiny humanoids who look like fairies. However, when angry their mouths spit sideways into insectile mandibles, revealing them as wasplike monsters.
  • In Overlord, Cocytus has a set of Functionals that appear to be more for crushing than piercing.

    Films — Animation 
  • Mister Scroop from Disney's Treasure Planet has a pair of ant-like mandibles added onto a conventional maxilla-and-mandible mouth, qualifying as Decorative. They fit well with his arachnoid body, six walking legs and irisless eyes. They're appropriate for a character who's The Dragon of a cutthroat pirate band.
  • Some of ants in The Ant Bully have Decoratives in order to keep their insectoid appearance while still looking relatively human.

    Films — Live-Action 
  • These show up with surprising frequency in the Blade Trilogy. The Reapers in Blade II are Bifurcated, while Dracula's true form in Blade: Trinity has multiple sets of Functionals.
  • The Predator in, well, Predator has two sets of Functionals. This carries over to the Predaliens in Alien vs. Predator.
  • The Creeper of Jeepers Creepers has Functionals that it typically keeps pressed flat against its face to disguise the inhuman features.
  • The Mega Kaiju in Pacific Rim: Uprising has a set of Functionals in the form of insect mandible-like projections from the lower jaw tipped with nasty-looking tusks.
  • Shin Godzilla: The titular Kaiju has a serpentine bifurcated jaw that splits open when he uses his Atomic Breath.

    Literature 
  • In The Kane Chronicles, the scorpion goddess has a set of Functionals inside of her human mouth.
  • In Worm Taylor/Skitter evokes this artificially with her mask, which is designed to resemble the mouthparts of a insect to make her seem more frightening.
  • In the John Carter of Mars series, apts are an unholy combination of abominable snowman and hippo, and among their many horrifying features is a set of mandibles.

    Live-Action TV 
  • In the Doctor Who episode "Utopia", the alien scientist Chantho — an insectoid Rubber-Forehead Alien — has a large set of Decoratives framing a normal human mouth.
  • In The Strain, the vampires have fleshy mandibles that are typically retracted into their throat but come up into the mouth when they feed. They aren't used to feed themselves but act as a sheathe for the "tongue" the vampires use to drink blood, making them a strange variation on Functionals.
  • Supernatural: Creatures from a parallel universe, called "canids" in the script, that were introduced in the Season 13 episode "Wayward Sisters" have mouths of this type. To use the words of the Supernatural wiki, "the canids mouth reveals a mandible that when opened reveals a beak with tendrils."

    Tabletop Games 

    Toys 
  • The Transformers G1 had Repugnus, an Autobot who's alt-mode was a sort of bug-monster with both normal jaws and functioning mandibles. As a gimmick on the toy, a button on his monster mode's head could be pressed, causing his mandibles to open and close and cold sparks to shoot from his mouth.

    Video Games 
  • The eponymous metroids of Metroid have Replacements, with one set used to hold onto prey and another set for the actual life-drinking.
  • The mutations of the necromorphs in Dead Space usually cause their lower jaws to split into Bifurcated.
  • Larger zerg, particularily hydralisks, in Starcraft II have a hybrid between Functional and Bifurcated, with an outer set of jaws splitting apart.
  • All of the monsters in Evolve have some kind or another. The Goliath and Gorgon both have Functional, while the other three all have Bifurcated.
  • The Elites/Sangheili in Halo have two sets of jaws. Depending on how one looks at it, it could either be two sets of Bifurcated, two of Functional, or one set of each. Expanded universe materials make clear that they have trouble pronouncing phonemes in human languages because of them (and conversely, humans have trouble speaking their language).
  • The final boss of Mass Effect 2 has two sets of what would be considered Functionals if it wasn't a machine.
  • The turians in Mass Effect are covered in bony plates which form beak-like protrusions, bony heel spurs, and spiky crests as well as Functional mouthparts on either side of their jaws, giving them beak-like points in place of lips, needle-like fangs, and insect-like mandibles. In spite of this, they're possibly the alien species with which humans actually have the most in common.

    Web Comics 
  • In Kill Six Billion Demons, the dragon-like demiurge Mammon has a Bifurcated for both his upper and lower jaws, though he typically keeps them held together to resemble a more traditional muzzle.
  • In Grrl Power, a minor character named Chorius has a set of Decorative.
  • In Unsounded, the Snake Person Ruck has a set of Functionals on his lower jaw, as well as a pair of small arms growing from back by his ears that seem to serve a similar purpose. He's also an ancient monster who melts minds and drinks thoughts, so they're far from his most inhuman trait.
  • In Earthsong, The Spinster is an anthropomorphic spider-like alien who reveals a set of mandibles to accompany his fanged mouth on the rare occasions he shows his face. The implicit threat of doing so is part of why his species usually wears veils.

    Western Animation 
  • The Insecticons in Transformers Prime have mandibles that are technically Functional, but since they don't actually eat they work more like Decoratives. Either way, it emphasizes their primal, animalistic nature compared to the more mechanical Decepticon Mooks.
  • Admiral Trench from Star Wars: The Clone Wars is an insectoid alien commanding a Separatist battalion of Mecha Mooks. He has two large chelicerae at the sides of a fairly regular mouth that speaks articulately, though punctuated with Verbal Tic clicking. These chelicerae seem to be Decorative, as Trench is never seen using them.

    Real Life 
  • Actually averted with many insects that have piercing and sucking mouth parts rather than ones adapted for biting and chewing.
  • Many snakes actually have a Bifurcated type with their lower jaw, though the connective tissue of their mouth means it looks like one piece until you see the skeleton. Many monitor lizards have the same arrangement. In both cases, this allows the animal to stretch their jaws wide in order to swallow large prey.

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