Leviathan Class Organisms

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Leviathan is a classification given to extremely large creatures of the Subnautica universe. Although the wording of the Reaper Leviathan's databank entry would seem to imply that the leviathan classification is exclusive to predatory life forms, this is not the case; any fauna species of a suitable size can be classified as a Leviathan.
Although the term "Leviathan" is used to refer to a large mythical aquatic creature in the real world, there is no confirmation on whether the Leviathan classification is restricted to fauna in the Subnautica universe, or is simply the term used for any species of a sufficient size.
==Relation to Other Leviathans==
Leviathan is not part of a taxonomic classification, so does not imply any of the species classified as such are related. In fact, the only two that appear to have any close relation are the Sea Emperor Leviathan and Sea Dragon Leviathan who share several features including an almost identical body shape, seven identically positioned tentacles dotted with glowing spots, two forelimbs and a pair of light-producing organs atop their snouts. These two most likely shared a common ancestor that has since diverged into a smaller, cave-dwelling predatory species and a larger, planktivorous species residing in the open ocean.
==Leviathans of the Past==
Despite being enormous when compared to the fauna of Earth, the leviathans inhabiting Planet 4546B in the present day are dwarfed by their predecessors; the three-million-year-old Gargantuan Fossil at full length is estimated to be 6-8 times longer than an adult Sea Emperor Leviathan specimen. To support a predator of such titanic proportions, many of the other creatures of that time period must have also been of colossal proportions.
The one-million-year-old Ancient Skeleton is a massive, well-intact, skeletal structure consisting of a head attached to a unique armored carapace. It's size surpasses that of the living leviathans, and gaps in the teeth are large enough for Ryley Robinson to swim through comfortably. The totality of the ancient skeleton is unknown; consequently, it's locomotion and original size cannot be pinpointed. The bulky armored skeleton is around 100 meters in length, giving it more body mass than anything alive on the planet today.
==Known Leviathan Class Organisms==
===The Crater===
*Sea Treader: About 20 meters (65 feet)
*Reaper Leviathan: 55 meters (180 feet)
*Reefback: About 70 meters (229 feet)
*Ghost Leviathan Adult: 110 meters (360 feet)
**Ghost Leviathan Juvenile: About 67 meters (219 feet)
*Sea Dragon Leviathan: 112 meters (367 feet)
*Sea Emperor Leviathan: 160 to 200 meters (524 to 656 feet)
**Sea Emperor Leviathan Juvenile: About 80 to 90 meters (262 to 295 feet)
**Sea Emperor Leviathan Baby: About 1.5 meters (5 feet)
===Sector Zero===
*Glow Whale: 30 meters (98 feet)
* Chelicerate: 40 meters (131 feet)
**Void Chelicerate: 65 meters (213 feet)
* Shadow Leviathan: 60 meters (197 feet)
* Ice Worm: 95 meters (311 feet)
* Ventgarden: 110 meters (361 feet) in height
**Juvenile Ventgarden: About 22 meters (72 feet) in height
The Squidshark is about 11 meters in length, and described as "a leviathan-class predator at the smaller end of the scale" by its databank entry. However, the squidshark is excluded from the databank's leviathan tab. 
==Extinct Leviathan Class Organisms==
===Crater===
*Ancient Skeleton: Exposed skeleton around 95 meters (311 feet), full size unknown
*Gargantuan Fossil: Around 1,100 to 1,300 meters (4,265 feet)
===Sector Zero===
*Frozen Leviathan: About 70 meters (230 feet) excluding tail; about 150 meters (492 feet) total.
==Size Comparisons==
<tabber>
Against Player=
SeaTreader5.jpg|Sea Treader (player below torso, in between legs)
Reaper Sizeref.png|Reaper Leviathan (player above neck)
Reefback11.jpg|Reefback Leviathan (player far in front of head)
GL Sizeref.png|Ghost Leviathan adult (player above head sail)
SeaDragonLeviathan18.jpg|Sea Dragon Leviathan (player in front of mouth)
CacheSkeletonSizeref2.jpg|Ancient Skeleton (player in mouth)
Skull.jpg|Gargangtuan fossil size compared to Ryley, Seamoth, Prawn Suit and Cyclops (comparison by user Jurandfantom)
Chelicerate Size Comparison.png|Chelicerate size comparison
VoidCheliceratesizeref.jpg|Void Chelicerate size comparison
Glow Whale Sizeref.jpg|Glow Whale size comparison
IcewormSizeref.jpg|Ice Worm size comparison
ShadowLevsizeref.jpg|Shadow Leviathan size comparison
Ventgardensizeref.jpg|Ventgarden size comparison (Player is tiny dot above the bell)
Juvventgardensizeref.jpg|Juvenile Ventgarden size comparison
|-|
Against Other Creatures=
Reeeeeeeeeeef.jpg|Reefback Leviathan to Reaper Leviathan
SomeSNEKS.JPG|Reaper Leviathan, juvenile Ghost Leviathan and adult Ghost Leviathan
TheBigBoyos.png|Approximate comparison between two non-Leviathans, a River Prowler and Ampeel, and three leviathans, a Reaper Leviathan, Reefback Leviathan and Sea Dragon Leviathan
Lorge.png|Size comparison between various leviathan and non-leviathan creatures
</tabber>
fr:Classe Léviathan
Category:Fauna
Category:Extinct Species
Category:Leviathan Class