Aitectli

Physiology
The Aitectli are amphibious Fish humanoids, forever bound to not stray far from water. Their skin needs to be mantained wet and/or slimey for their wellbeing, as their respiration is aided by their skin being very vascularized. This is helped with use of naturally gelly lotions and substances, and the wearing of respiratory aids on one's head, like glass bowls or similar water carrying implements. Aitectli are aided in breating not only by their skin, but also by a dual respiratory system: they have lung cavities like humans, but also sport gills on their neck, ribs and shoulders, which can all be retracted into the body when out of the water to prevent essiccation. During these periods of dryiness, these cavities can also hold a small amount of water for allowing some respiration, although very limited. This system is akin of the ones in arthropods like crabs.

Aitectli blood is bright purple/fucsia (sometimes more blue, sometimes more red depending on the individual), and is functionally between mammal blood and horseshoe crab blood, having both hemoglobin, red, like mammals, and hemocyanin, blue, like octopi and horseshoe crabs. With these last ones they also share important immune cells that are exceptionally sensitive to toxic bacteria. When those cells meet invading bacteria, they clot around it and protect the rest of the horseshoe crab's body from toxins, and the same happens in the Aitectli body.

This dual system emerged because of a defective gene that makes both individual system defective on their own (moreso the hemoglobine/mammal side of it). This means they have to partially work together to make up for the shortcomings. This allowes Aitectli to survive in both air and water but needing both to properly oxygenate, although air is a lot less necessary than water, as they can and often do go for weeks without a breath of air, depending on the subspecies, with the deep-sea subspecies getting all the 'air' they need from sporadic underwater cave airpockets and oceanic vents.

Their stature is around 5'5", with a generally slim build, with spare ecceptions.

Evolving in the liquid enviroment meant a lesser development of muscolature for the purpose of weightbearing, water aiding with boyancy. Which resulted in the forementioned slim built and a lesser ability to carry weight in the form of armor. This resulted in the Aitectli usually wearing only boots and helmets as armor goes, while preferring lighter or no armor alltogether. Gravity also isn't kind to their fins, hair and other soft parts. Since they are usually held aloft by water, they tend to adhere to the body or flop when out of it, and only a few go through the hassle of flexing the extensor muscles that often accompany the fins and ridges, as to give them a more erect shape, as it takes energy to do so.

The Aitectli are one of the most diversified of the Alathra species, with a great deal of personal variability and uniqueness. Many subspecies arose from a basal ancestor, each one perfectly adapeted for a particular habitat. From the black meanders of the deep ocean, with its denizens of bioluminosity and transparency, to the dull colors and frills resembling dead foliage of the swamps, to the vibrant colors of the coral encrusted reefs, every denizens sports on his or her skin the signs of ages of evolution. Said skin is not scaley, like one of a fish, but leathery like an seal or a dolphin, taut and dense, with a dense but think layer of fat that makes them immune to most cold temperatures. This layer is thinner in subspecies native of hot climates, but still present. Its not uncommon to spot a Aitectli with actual vegetation growing or weaved into tentacles, hair or limbs, sported either as jewlery or clothing. This kind of vegetation must either grow on an individul who never leaves the water for long, or be very resilient to drying, for the more adventurous. The same can be said for corals and anemones, (which are actually animals), eager commensals of their host, and sometimes photosyntetic.

Aitectli evolved a system to walk on land efficienltly but also being able to swim swiftly: their pedal fins are foldable. When swimming, the long surface is unfurled forward and kept semirigid by simple muscolature. When on land, this flap is folded upward against the bridge of the foot, covering it up to the ankle and to the sides. It's the Aitectli version of walking around with curled toetips, unconfortable, but doable and easely gotten used to with exercise. Often soft and confortable straps, or spats, can be tied to the foot to keep the fold in place and allowing for the muscles to relax, while providing support and protection for the underside of the foot and especially for the folded fin, which is innervated. Its important to remember that while humans are used to have their feet callousing over, in the sea there is little use to walking and especially avoided in the sharp reef, so the foot of the Aitectli is not as resilient. Also in this case, regional evolution has a hand in how much this is true, more for the reef and less for the shallow and full of currents water of the swamps, where stabilization using hands and feet are prominent.

Culture and Mind
The Aitectli aren't folks of high emotions, both negative or positive, and not very inquititive or curious, compared to the other species of Alathra. They deal more in 'black and white' or in practical terms than phylosophical (with rare exceptions of course). They respect deeply traditions, and seldom question them. That said, there is little to question, as the culture has settled in one of honesty and respect, and traditions are meek and unintrusive.

Their homeland is remote and unknown, hidden from the outer world, and shielded from cultural contamination. Despite this, there seem to be a common ancestor with the cultures of the outer world, and some hypothesize the Aitectli to be the 'living fossils' of cultures.

This low aptitude for curiosity and exploration is episodically dotted with slightly more curious individuals, once in a very long while, a century or two, which then go on and explore a bit further than the Aitectli that come before, sometimes creating new settlements, or reclaiming abandoned ruins (more common).

Religion
[Main article: Tidalism]

Its unusual for an Aitectli to have a different religion than Tidalism, in which case agnosticism and atheism is usually preferred to an outright different religion. The Rulers (Tlatoani) of the Aitectli are usually also the head of the religion.

Architecture
Aitectli architecture is quite cohesive, in line with their sticking to traditions, and features stone buildings with a round or square base, with enormous carved murals and domed rooves. This for the more permanent and important buildings. Aquamarine stone is used as accents and is more prevalent on the more presigious buildings, like temples. Very often artificial structures integrate directly coral, or have coral growing on top of them, especially in the subspecies that come from the reef. In other subspecies, native hard materials are incorporated, like mangroves in the swamps, and stalagtites in the flooded caves of the deep.

For more temporary or leisure related shelters, they prefer ones made of textiles and wood, mainly tents and awnings.

Technology
[Note: this information is not currently available to anyone outside the Aitectli culture, and even the Aitectli themselves only have an inkling of this, passed on in forgotten myths] Although the ruins of the ancients show the Aitectli used to have an extremely advanced civilization and technology (which would now be considered almost like magic), the state of such structures tells a story of something cathastrophic happening, a cataclism of their own creation, a direct consequence of this technology, probably mixed with hubris and arrogance.

Because of this event, the species was forever changed in both its biology/psychology (the lack of curiosity) and their access to knowledge and technology, thrusting them back to before the middle ages, to a primitive state.

Slowly, even the ancient language was forgotten (although not completely), in both writing and speech. Other languages seeped in from outside to replace this vacuum, leading to modern Aitectli being able to speak and comprehend the common language of Alathra.

Even with the most important parts of technological advancements gone, and even with curiosity dampened, the Aitectli still manage to find ingenious ways to navigate day to day problems, by using the 'natural technology' of their own enviroment.

For example, they dont have sheep in the depths, but it is possible to gather the excretions (Bisso) of seashelled creatures like clams to create fine clothing: this material is used by the animal to stick to rocks, and it hardens like cement, but treated in a specific way, it can become strand-like and be woven.

They also dont have strong glue (weak clue can be done with fish), but there are some animals that construct their 'shells' by glueing together small pebbles and sand around them. This substance can be more easely used than the clam one, as the animal is an anellid (Sandcastle Worm), but it works basically the same, creating a strong but resilient bond.

Use of Dry Spaces
Although Aitectli prefer to stick to a wet enviroment, they are fundamentally amphibious, and so benefit from dry spaces. Just like a Human kitchen has a faucet and a sink, a model kitchen of an Aitectli also has a source of air, often imported from outside of it (like an oldschool kitchen before the advent of plumbing in the human world), or even better, from a gas pocket within the kitchen itself, which gets plugged so to not let the air escape.

Just like water falls in air, air floats up in water, and this mechanism is taken into account when collecting the air, with big buoyant baskets or bells held on top of the 'faucets' of the air pockets to collect the air floating up. These air bubbles get used in 'dry rooms' (or in the bells themselves) where mixing of dry ingredients needs to occur. This allowes Aitectlis that are permanently bound to water to perform 'dry labour' like drying kelp, that when is then covered in oils as dry, becomes hydrophobic, allowing similarly hydrophobic inks to be used to write.

Another use of 'dry rooms' is in the medical field, where blood in the water would make a cloud, making visibility almost null, or when there is an infection of the skin, where water would worsen it.

Although it is told that Aitectli knowledge of medicine was once much more advanced, nowadays the available knowledge is sparse and almost primitive, with surgeries at a medieval level, and strictly performed by the elders.