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Description
Somewhere in the depths of space there is a solar system similar to ours, but with a different history of the development of life on Earth. The most common and mysterious creatures are "ghosts." In appearance, they look like flying jellyfish and to some extent this is so: “ghosts” are primitive intestinal cavities, in which characteristic stricken cells have not yet formed. It is also worth noting that, unlike other coelenterates, their bodies consist not of two, but of three layers of the dermis.

On the ectoderm, the organs of smell, touch, and so on are formed. Primitive organs and tissues, as well as hemolymph, are formed in the mesoderm. And in the endoderm there are gas bags that perform two main functions: the skeleton and muscles. In fact, they can be compared to live balloons. All these three layers of skin are very flat and elongated and together with internal organs and hemolymph occupy about 5-10% of the total body weight. The remaining 95-90% is the gas itself. This is due primarily to the fact that the density of their planet is approximately the same as ours on Earth.

As for their organs and tissues, in this regard they are not much different from flatworms. Their eyes are arranged in the same way as in arachnids, even despite the fact that they are very flat and wide. The structure of their muscles can be compared with Pneumatic artificial muscles by the principle of work. Many representatives are hermaphrodites. Their limb bodies are transformed tentacles. If you think that it will be easy to pierce, then this is not so: their skin is extremely elastic and can and quite poorly pierced and scratched. And even if you can pierce, then hemolymph starts to become very viscous. Thus, it is quite problematic to bleed air from bodies. It is also worth noting that many different species can change the concentration of hydrogen and other gases in their bodies, which will allow them to vertically take off and fall to the ground, maintaining a given body shape due to their skin, which is like rubber.

In general, they are divided into 2 large groups: vertical and horizontal phantoms. Vertical ones are a kind of group: their ancestor was radially symmetric, then he became two-sided symmetrical, and with the transition to vertical flight, they again became radially symmetric. The vertical ones retained their body position and are not much different from their aquatic ancestors. At the same time, among the vertical there are also completely terrestrial species that prefer to walk on the ground, thereby avoiding competition with more advanced flyers (and such non-flying ghosts live only on individual islands that were formed by the geological activity of volcanoes).

The vast majority of them are small flying forms that take off either to give offspring, or living in the form of photosynthetic organisms. Photosynthesizing themselves are of three types: tetrafolia, bifolia and mixotrophs. Tetrafoila animals have 4 wide, flat tentacles, which contain algae. They form a symbiosis with algae, but can also contain special bacteria in their reduced stomach that allow them to absorb nitrogen from the atmosphere and synthesize various complex organic compounds that serve as a source of food and energy. Bifolia have flat lateral edges on the "tail". Being larvae, they actively swim through the water column and filter it, eating photoplankton, and some individuals can eat algae with the help of complex mouth tentacles (their tentacles form a tube that sticks into the algae, from which juices are then sucked). Subsequently, they store chloroplasts in their flat lateral edges. Becoming adults. they completely switch to a photosynthetic lifestyle. Mixotrophs are a species of bifolia that prey on their photosynthetic counterparts.

Almost all ghosts go through a pretty elephant life cycle. As you can see here, future flyers are jellyfish with one long tentacle through which water exits. Then they develop a mouth and mouth tentacles, which allow more efficient filtering of water. Then the larvae enter the so-called “fish phase”: these are some of the passive filtrates that become active phyto- and zoophages. Then some species, with incomplete transformation, go into another phase, which is called the "predatory boat". In this state, their water is replaced by a mixture of gases, but the concentration of hydrogen there is low, and therefore they can’t take off, despite the fact that the amount of this air is enough so that they can maintain a constant body shape. And, in the end, they become adults who can already fly.

Their habitat: sky over the oceans. Less commonly, these can be ponds and lakes

Description
Somewhere in the depths of space there is a solar system similar to ours, but with a different history of the development of life on Earth. The most common and mysterious creatures are "ghosts." In appearance, they look like flying jellyfish and to some extent this is so: “ghosts” are primitive intestinal cavities, in which characteristic stricken cells have not yet formed. It is also worth noting that, unlike other coelenterates, their bodies consist not of two, but of three layers of the dermis.

On the ectoderm, the organs of smell, touch, and so on are formed. Primitive organs and tissues, as well as hemolymph, are formed in the mesoderm. And in the endoderm there are gas bags that perform two main functions: the skeleton and muscles. In fact, they can be compared to live balloons. All these three layers of skin are very flat and elongated and together with internal organs and hemolymph occupy about 5-10% of the total body weight. The remaining 95-90% is the gas itself. This is due primarily to the fact that the density of their planet is approximately the same as ours on Earth.

As for their organs and tissues, in this regard they are not much different from flatworms. Their eyes are arranged in the same way as in arachnids, even despite the fact that they are very flat and wide. The structure of their muscles can be compared with Pneumatic artificial muscles by the principle of work. Many representatives are hermaphrodites. Their limb bodies are transformed tentacles. If you think that it will be easy to pierce, then this is not so: their skin is extremely elastic and can and quite poorly pierced and scratched. And even if you can pierce, then hemolymph starts to become very viscous. Thus, it is quite problematic to bleed air from bodies. It is also worth noting that many different species can change the concentration of hydrogen and other gases in their bodies, which will allow them to vertically take off and fall to the ground, maintaining a given body shape due to their skin, which is like rubber.

In general, they are divided into 2 large groups: vertical and horizontal phantoms. Vertical ones are a kind of group: their ancestor was radially symmetric, then he became two-sided symmetrical, and with the transition to vertical flight, they again became radially symmetric. The vertical ones retained their body position and are not much different from their aquatic ancestors. At the same time, among the vertical there are also completely terrestrial species that prefer to walk on the ground, thereby avoiding competition with more advanced flyers (and such non-flying ghosts live only on individual islands that were formed by the geological activity of volcanoes).

The vast majority of them are small flying forms that take off either to give offspring, or living in the form of photosynthetic organisms. Photosynthesizing themselves are of three types: tetrafolia, bifolia and mixotrophs. Tetrafoila animals have 4 wide, flat tentacles, which contain algae. They form a symbiosis with algae, but can also contain special bacteria in their reduced stomach that allow them to absorb nitrogen from the atmosphere and synthesize various complex organic compounds that serve as a source of food and energy. Bifolia have flat lateral edges on the "tail". Being larvae, they actively swim through the water column and filter it, eating photoplankton, and some individuals can eat algae with the help of complex mouth tentacles (their tentacles form a tube that sticks into the algae, from which juices are then sucked). Subsequently, they store chloroplasts in their flat lateral edges. Becoming adults. they completely switch to a photosynthetic lifestyle. Mixotrophs are a species of bifolia that prey on their photosynthetic counterparts.

Almost all ghosts go through a pretty elephant life cycle. As you can see here, future flyers are jellyfish with one long tentacle through which water exits. Then they develop a mouth and mouth tentacles, which allow more efficient filtering of water. Then the larvae enter the so-called “fish phase”: these are some of the passive filtrates that become active phyto- and zoophages. Then some species, with incomplete transformation, go into another phase, which is called the "predatory boat". In this state, their water is replaced by a mixture of gases, but the concentration of hydrogen there is low, and therefore they can’t take off, despite the fact that the amount of this air is enough so that they can maintain a constant body shape. And, in the end, they become adults who can already fly.

Their habitat: sky over the oceans. Less commonly, these can be ponds and lakes