Information
Gelioichthys (Gel-eo-ick-these; meaning "Evil Giggle Fish") is a semi-aquatic hybrid dinosaur. Originally known as Scylla (or Scyllaβ), it was one of the top 10 finalists in the 2018 Hybrid Contest but lost to the Avinychus. After the contest, Scylla became the devasaur of its original creator and in March 2022 would become a playable creature. In June 2024, Scylla received a redesign and was renamed to Gelioichthys.
Like the Avinychus, Gelioichthys will not become a limited edition playable.
Appearance
Adult
The adult Gelioichthys is a grey colored hybrid. Its jaws can split into 2 with each jaw having the teeth of a Dunkleosteus and Megavore, the splitting mechanizing allows it to split each jaw to the shape of a dragonfish's mouth. At its lower and upper jaws are barbels with 2 at the upper jaw and 1 at the lower jaw at each side, on its necks is a set of gills with 6 at each side.
It has a frill at the back of its head just like the Megavore with a set of 6 spikes like a lionfish. Its arms are at the same position as a Thanatosdrakon with 2 fingers at each arm with the rest of the arm having a long spike with 7 smaller spikes at its lower arm, after its spikes it has a small fin like Dunkleosteus.
Its legs are the same as the Megavore with a sail at their back, its tail is long like a boa constrictor with 2 sails one at its back of the tail and one at the lower part of its tail with the end having a webbed fluke, and across its body are glowing parts from its head to its tail.
Juvenile
The juvenile Gelioichthys is not as vibrantly colored as the adult, with a spikier throat, smaller whiskers, and shorter back spines. The neon markings are not as bright, and the tail fin is purple.
Baby
The baby Gelioichthys is palely colored with a blueish body with a purple tint, fewer neon markings, and no back spines. It lacks whiskers and has shorter claws on the tip of its wing-like arms. The neon markings are white, and the arm markings are light blue. Its tail fin is light purple, and it has only three spikes on its throat.
Roars
| Roar | Audio |
|---|---|
| Roar (R) / AOE (1) | |
| Call (C) | |
| Growl (G) | |
| Credits | |
| All roars were created by Type_Five. | |
Gallery
Trivia
- The Gelioichthys is the 4th hybrid, 2nd Semi-Aquatic Hybrid, and 111th dinosaur added into Dinosaur Simulator.
Information
Scyllaβ, or "Scylla Beta", is the original version of Gelioichthys. As Scylla, it was one of the top submissions that made it into the 2018 hybrid contest but lost, later becoming a devasaur for its creator. Years later, it became its own playable that all players could get.
Naming Convention
The playable was given the name "Scyllaβ", rather than "Scylla", as a measure to prevent players from using the actual devasaur in older versions of the game, a glitch notoriously performed with the Wyvern skin. However, beyond preventing abuse of the powerful devasaur, the main reason was to prevent data scrambling from performing the glitch. An anti-exploit method added in 2018 would destroy the data of players who played as devasaurs without actually 'owning' them in-game, something that wasn't previously there for Wyvern.
Appearance
Scyllaβ is a black hybrid, its lower jaw is split into 2 parts with each part of the jaw having 4 teeth, it has 2 mantis-like forelimbs with each limb having 2 spikes between the upper and lower arms, and it also has flattened tail similar to that of Mosasaurus with that extends when coming closer to the end of its tail. It has plates on its back. At the beginning of its tail, it has a shark fin. The head also has a purple tissue that is thought to cover its brain. It has gill slits on its neck that visibly vibrate as it roars.
Roars
| Roar Type | Audio |
|---|---|
| Roar (R) / AOE (1) | |
| Call (C) | |
| Growl (G) | |
| Credits | |
| All roars were taken from an unknown source. | |
Gallery
Trivia
- The Scyllaβ was originally added with default roar sounds, not those that the original devasaur had. After its remodel was added, it would get its roars back.
- Scyllaβ shares its R roar with the Wyvern skin, although the Wyvern had the roar before Scylla's addition.
Information
Scylla (not to be confused with Scyllaβ, the original version of Gelioichthys) is a skin originally added as part of the Odyssey event, it is one of the S-DNA Exclusive Odyssey Skins alongside Firebird, both of which costing 
2,500 S-DNA. The skin is based on the Greek mythological monster of the same name, much like the original Scyllaβ.
Appearance
Scylla is a monstrous skin with 6 eyes, 3 on each side of its head, and a random near crocodilian assortment of teeth along its mouth. The bottom of its neck has numerous spikes. It has a spike near the "cheek" region on both sides of its face. Scylla has three tails, each ending in a dog-like skull placed upside-down with the middle tail's skull falling forward whilst it is in the growl animation. Scylla also holds bulky, mantis-like arms similar to the Scyllaβ skin.
Roars
| Roar Type | Audio |
|---|---|
| Roar (R) / AOE (1) | |
| Call (C) | |
| Growl (G) | |
| Credits | |
| All roars were created by Vampirfinch (Phoenix). | |
Information
Reaper Gelioichthys is a Halloween event-exclusive skin for Gelioichthys. It was added during the 2024 Halloween Event and could be purchased for 500 Wisps.
Appearance
The Reaper Gelioichthys has a skeleton with its tail covered in goo while its torso and arms are covered with a reaper's cape, covering the red eyes of the Reaper Gelioichthys. Its arms resemble a scythe with some bone covering the scythe. Just like Gelioichthys, it has splitting jaws.
Roars
| Roar Type | Audio |
|---|---|
| Roar (R) / AOE (1) | |
| Call (C) | |
| Growl (G) | |
| Credits | |
| All roars were created by Vampirfinch (Phoenix). | |
Gallery
Trivia
- Reaper was the most expensive Wisp-buyable skin of the 2024 Halloween Event.
Information
The Throwback Gelioichthys is a Throwback event-exclusive skin for Gelioichthys. It was added during the Throwback Event and can be obtained from the Throwback Egg with a 1% chance.
Appearance
The Throwback Gelioichthys has a blocky body with a long tail, 4 spikes on the back, gills on the side of its neck, and spikes at the top of its back. Other features also include legs with a fin attached to them with the arms having 2 claws with a large claw that is connected to a long finger. The head has 4 eyes with a normal mouth and fins near its head.
Gallery
Information
Kaiju Gelioichthys is an all-terrain, limited-edition skin that was available to buy for two weeks, starting from its addition on March 28, 2025, to April 11. The skin, since it is all-terrain, comes with slight debuffs from the Default Gelio. It also has custom roars.
Appearance
Adult
The adult Kaiju Gelioichthys has pale, silver skin covering its upper body and dark grey on its legs, lower arms, and tail. It has a paler underside and grey scale patterning on its wings, along with pale blue luminescent markings present on its tendrils, flanks, wing fingers, and striped tail. The crest is slender and trapezoidal with luminescent markings, and its head is angular with slim split jaws and a pale blue mouth. It has a dark blue forked tongue. A row of silver plates line the top of its back, and a short spine runs across its neck and the beginning of its back with three tendrils atop it. The eyes are light neon blue.
Young
The young Kaiju Gelioichthys lacks the neck and back features the adult has. Its wing membrane is mostly absent except for between its fingers. The colors are more faint and its underside and face is more peachy in color. The blue regions are more pale and slightly greenish.
Gallery
Trivia
- The Kaiju Gelioichthys was based on Otachi, a heavy, flying kaiju from the film Pacific Rim.