毒日蛛科有着独特的半球状肛节，肛门位于腹侧（其他避日蛛肛门在腹部末端）。该科有着更大的身体和更短的腿，大多数有着鲜艳颜色或高对比色。雌雄都螯肢发达。雄性鞭毛轻易不可动（paraxially immovable）并由两个扁平卷曲的刚毛组成。俩螯中间有弧形短喇叭状管。
Rhagodidaeby the unique hemispherical form of their anal segment and their ventrally located anus (terminally located in all other groups of solifuges). Rhagodids are heavy-bodied and short-legged. Many are brightly or contrastingly colored. The cheliceral dentition is well developed in both sexes. The flagellum (present only on males) is paraxially immovable and consists of two flattened, curled setae that form a curved, truncate horn-like tube on the mesal surface of the chelicera.