From a high-gravity world where the atmosphere is about 7 times denser than that of Earth, the gremmik resembles nothing from Earth. It has one of the rarest adaptations in the universe: A wheel-and axle mechanism. It has 2 of these, one on each side of its mouth. These move 2 separate jaws, which are moved very quickly in circles to butcher anything dragged into their mouth. This is extremely rare because of the complex evolutionary path needed to create a wheel and axle in a living organism, but in the few examples that exist, it is a highly efficient mechanism. It is moved using muscles that contract and relax around the rotating bone, which is connected to the jaw bone. To catch prey, 2 long tentacles with teeth are rolled out, and are curled around anything that moves over them. These tentacles pull the catch into the mouth, where the rotating jaws slice and grind it against rough, bony plates.
Tentacles serve the purpose of a tongue, putting pieces of their prey into a pharynx. The digestive system has valves to keep the food in their stomachs. Their digestive system isn't actually very different from ours in the general layout, but almost everything else about it is completely alien.
Their brain is like a foam, with information-processing tissue between the bubbles. This allows them to process information coming from their 8 heat-sensory pits and eyespot, along with their skin and ears. The ears are located directly on top of the rotating bones. The eyespot is at the top of the gremmik's cone-shaped body. They move using 2 snail-like feet, although they move only when they need to.
On the bottom of these feet are many spore-producing organs, which let them reproduce in a very unique way. The spores grow long hyphae, which connect to fertilize them like in fungi. When they are fertilized, they produce "eggs" scattered around the ground, which contain a gremmik embryo. These are fed by the hyphae, and hatch when they're ready.
Their respiratory system has 3 openings: 1 air intake and 2 exhaling nostrils. This system is directly connected to the circulatory system, which uses hemerythrin (a purple, iron-based compound) to transport oxygen. There are 2 hearts: One, the heart visible in this diagram, is a simple 1-chamber system that pumps blood from the lungs and to the brain. The other is 2-chambered, and along with the organ that serves the function of both a liver and the kidneys, is obscured by the intestines.
The large, red organ in the picture stores nutrients when they are not needed immediately, mostly consisting of fat. It also processes hard-to digest nutrients. All the purple space is empty. The hollow part inside of the organ skull contains not only organs, but also mobile organelles, which are mostly symbiotic creatures. Some of these are visible to the naked eye.
Written by salpfish1.DeviantArt.com