Ti-tu-kong ia̍h Arachnida sī chat-kha bô-chek-chui tōng-bu̍t, sio̍k-tī Chelicerata a-mn̂g ê 1 e kong. Ti-tu-kong sī lio̍k-tē chú-iàu ê chat-kha tōng-bu̍t, ū 65,000 ~ 73,000 ê chéng, pau-hâm ti-tu, lâ-giâ, giat-á (scorpion), ??? (opiliones), ??? (tick), kap ??? (mite).
