High-leg breed
A large subspecies with thinner and longer legs than standard arachne. These large arachne are mild-mannered. They cannot produce thread, but they move surprisingly quickly to secure their prey. Their hunting instincts are so powerful that they will sometimes abandon the prey they have captured to pursue new prey. As they are especially uncompromising regarding the extermination of household pests, they are respectfully known among those troubled by such pests as "sergeants."
"Sergeant Ashidaka" is a 2ch slang word used for huntsman spiders (ashidaka-gumo, literally the "High Leg Spider", in Japanese) with respect.
The etymology of this term stems from a 'friendly forces reference chart' posted on the 2ch military board "anti-cockroach thread":
Chairman of the Joint Chiefs of Staff Granny, General Grandfather, Marshal gecko, Commander Mom, Master Sergeant mantis, Sergeant Ashidaka, Corporal jumping spider (application for promotion to special duty officer was dismissed), Corporal doggy, Corporal Geji (the house centipede), Corporal Daddy, Private Yomenofu (wife), Leading seaman Army paratrooper spider child, were listed along with Army Air Corps lieutenant emerald cockroach wasp, but because this insect does not exist in Japan, its inclusion was treated as a completely part-time honorary position. The relative class rankings of human beings is a tongue-in-cheek suggestion that older Japanese people do not have any fear of cockroaches, and fathers will not actively fight cockroaches even if they come out into full view.
As suggested by its high rank in the list above, the gecko is very adept at preying on cockroaches, but it is said that because the gecko will not hunt when it is not hungry, the 'Sergeant', who even when engrossed in consuming the spoils of its last hunt will immediately swoop onto any new targets that it sees, has superior pest control abilities.Arachne
A non-human species with the lower body of a spider. Arachne have between four and six eyes and are completely carnivorous. They secrete thread from the tip of their abdomen that they use to spin webs and traps. These hunters normally capture their prey in traps, but as hunting is unnecessary in human society, they pass the time by making knitted goods and dolls with their thread. Their hunter instincts compel them to tie people up and play with them. They get drunk off caffeine.Arachne SubspeciesLarge breed
A subspecies far larger than standard arachne with thick legs and a covering of hair. They are very wild and aggressive. In addition to being strong, they also have venom, making them extremely dangerous to approach without caution. However, their venom is not particularly strong or harmful. They are not well-suited to interspecies exchange programs, and when they have interacted with humans, they were arrested for assaulting them and causing other problems.Small breeds
A subspecies smaller than the standard arachne. Their legs are short, but they can move much faster than standard arachne, and they are good at jumping and full of energy. Instead of spinning webs, small arachne wander around on the ground in search of prey. They can produce thread, but they only use it to stop their descent when they fall from high places.