What is the singular form of arthropoda?

Found UK black spider with red legs? Do ticks live on the beach? Are there mosquito's in Chile? What body part of insects they use to smell? What is a dummy warrant? What is a cabbage looper? I found 8 small maggot-like worms in my closet They are a reddish-brown color and have some sort of small hairs on the back Please help? What monarch brought many foods and styles with him? How long does it take a humeros to heal? What hunts down octopuses? What are you riddles? Do spiders like cold rooms? What is the taxonomy of the Black Widow Spider? What mini beast starts with the letter n? Will ivy house plant hurt dogs or cars? What do you use krill for? If you found One roach in your house is there more? What is the name of butterfly that mitegrate from one continent to another continent? Is it possible to minimize or get rid of a scar that is over 4 months old and if so how can it be done? Does a regular exterminator have to get certified for bed bug extermination?