Tall, common, and incredibly fast, Pheromosa is a humanoid arthropod perfectly adapted to its desert home. Its white coloration allows it to easily blend in with its sandy surroundings, making it difficult for predators to spot as it sunbathes on a rock or dune. Like many known species of Bug-type, Pheromosa is an ectotherm that must bask frequently to maintain its body temperature. To overcome the danger of constantly being out in the open, Pheromosa has evolved not just camouflage, but an additional defense mechanism: speed.
Pheromosa is lightning-fast in a very literal sense. The structure of its nervous system delegates processing power to multiple secondary brains along its spinal cord, giving it incredibly fast reflexes and reaction time. Its legs are composed almost entirely of highly specialized fast-twitch muscle that allow it to accelerate to 200 kilometers per hour under three seconds. The core of slow-twitch muscle is just as powerful, capable of maintaining endurance speeds of nearly 97 km/h. Some researchers report seeing it dodge lightning. Laboratory tests conducted on captive specimens has revealed that their antennae are incredibly sensitive, likely giving them a semi-accurate prediction of where lightning will strike beforehand. They are able to detect wind currents, electrical activity, and the faintest scents.
The Pokémon earn their name from the complex pheromones they emit to communicate. Curiously, their strongest and most well-known pheromone is not meant for their own kind, but for protection from other species. It targets the nervous system, causing a flood of oxytocin and norepinephrine that stops Pokémon and humans in their tracks. The potent blend emotions can only be described as awe, and the effects can cause those who inhale it to stop attacking, run away in fear, or even assist the Pheromosa in foraging. Pheromosa are immune to the effects of this substance and can smell the species' other signals underneath it. The organ responsible for all of the species' pheromones is located at the base of the nape, exposed by spiracles between portions of the exoskeleton. A Pheromosa can leave a dense trail of pheromones in its wake as it runs at top speed across the desert.
The chemical makeup of this pheromone is difficult to study. It breaks down very quickly when isolated, leaving several more stable compounds in its place. Captive Pheromosa have resisted having this pheromone extracted, and sedatives break down so quickly in their bodies that they can't be anesthetized long enough to obtain the chemical in its purest form.
Pheromosa typically live in small groups. Solitary Pheromosa, when they aren't basking or scavenging, wander the desert in search of others of their kind. If they are not accepted into an already-existing group, they will attempt to form a new one of other lone individuals. Pheromosa are very clean animals. Their saliva contains compounds that dissolve oil and grime and repel parasites. Pheromosa groom themselves whenever they get the chance, starting with their antennae and veils. Communal grooming is the main draw of grouping up. Each Pheromosa has different immunities, so grouping up allows them to share and bolster the survival chances of all members. Additionally, grooming keeps their antennae in working order so that they can keep up with the subtle chemical signals from other individuals.
Pheromosa bear no sexual dimorphism and are remarkably androgynous in behavior, even when seeking mates. Both captive and tagged males and females have been seen performing the same mating dances, and sex has only been determined by physical checkups. Both parents raise the young with the help of other group members, guarding the eggs in shifts and leading nymphs to the best food and water sources. Young nymphs often ride on the backs of adults. Underneath an adult Pheromosa's veil, a nymph is almost invisible. The young are born resembling miniature adults and molt six times before reaching maturity. Once grown, they leave in search of other young adults to form their own groups.
A rare recessive mutation may cause a Pheromosa to be born with a black lower body. These shiny variants stand out against the sand and make easy prey for hungry Irozei. However, the mutation has been observed to be attractive to other Pheromosa, and so the coloration remains in the gene pool via sexual selection. Some shiny specimens have been observed to have superior individual values, with all instances possessing at least two or three perfect values. This is likely due to the fact that weaker shinies were very quickly hunted down.