Cryptocledius are named after Cryptoclidus, a plesiosaur genus that lived during the Jurassic Period. While their name is sometime spelled "Cryptocleidus," which more closely matches the character Elsie Chapman's pronunciation of their name and the pronunciation of the name of the real Cryptoclidus, the majority of sources contemporary with Godzilla: The Series use the spelling "Cryptocledius." Their name is spelled in katakana as クリプトクレディアス (Kuriputokurediasu) in Godzilla 1954-1999 Super Complete Works, which emulates the official English spelling of the monsters' name. The packaging for the Game Boy Color game Godzilla: The Series - Monster Wars instead uses Cryptcledius, likely a misspelling.
Cryptocledius have the body of a plesiosaur with four fins, a long neck, two front legs with four claws, and two small fins on their tail. Cryptocledius are red with the underside of their neck being gray. They have four spikes running down their back, as well as four spikes on their tail. Their skull-like head features a mouth full of sharp teeth, three spikes underneath the mouth on both sides, and green eyes.
Cryptocledius were plesiosaurs, aquatic long-necked marine reptiles that went extinct at the end of the Cretaceous Period, 65 million years ago. However, it seems a number of the Cryptocledius somehow survived extinction.
After surviving the extinction of the other Cretaceous marine reptiles, at least two Cryptocledi lived deep in an ocean trench, and lived undisturbed until the discovery of the Leviathan Alien spaceship brought scientists from H.E.A.T. down to their level. One of the Cryptocledi attacked their vessel, but Godzilla came to defend them. Godzilla was able to fight off the Cryptocledius, but not for long.
When H.E.A.T. left the sunken ship in an escape pod, the two Cryptocledi converged on the pod, and were once again challenged by Godzilla. They worked together to try and defeat him, but ultimately, the Cryptocledi were both subdued by a rock slide.
A Cryptocledius was sent by the Leviathan Aliens from Site Omega on Isle del Diablo to eliminate H.E.A.T., who were approaching the island and battling the Giant Bat. Their battle raged on, and H.E.A.T. was able to emit a reverse frequency of the Bat's echolocation frequency in order to blind it. They then sent out a radar pulse to turn the Bat on the Cryptocledius, which worked, allowing them to escape, but the Leviathan Aliens stopped the fight and called the monsters back to Site Omega. As they approached, H.E.A.T. abandoned ship in order to ride to Site Omega on the back of the unwitting Cryptocledius. All of the monsters were then sent into the world's major cities to cause destruction. The Cryptocledius was sent to Hong Kong.
The Cryptocledius continued its rampage until H.E.A.T. deactivated the Leviathan Aliens' mind control beacon. At that point, it began to attack Leviathan Alien vessels until it was incapacitated by human forces.
The Cryptocledius are adept swimmers. They can also travel on land thanks to their front forelimbs.
In Godzilla: The Series - Monster Wars, the Cryptocledius is shown to be able to make physically damaging sonic vocalizations, even while underwater.
Both Cryptocledi were easily buried underneath rocks after Godzilla destroyed some undersea rock formations.
- Godzilla: The Series - Monster Wars (2000) - Nintendo Game Boy Color
A Cryptocledius was making its way toward the source of a Tachyon pulse emission in the Pacific Ocean by way of waters in or near New Jersey in the United States. It came face to face with Godzilla heading in the opposite direction. The Cryptocledius attacked with sonic vocalizations, but was ultimately incapacitated by the irradiated reptile.
A Cryptocledius in Godzilla: The Series - Monster Wars
- Main article: Cryptocledius/Gallery.
In other languages
This is a list of references for Cryptocledius. These citations are used to identify the reliable sources on which this article is based. These references appear inside articles in the form of superscript numbers, which look like this: 
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