Horsehair worms (Fig. 1) are unsegmented ,cylindrical, very long and slender worms with blunt anteriors . The body is covered by a thick layer of cuticle. Juveniles are parasitic are parasitic in terrial insects and adults are free-living in water. Adults have a vestigial digestive tract and do not feed. They usually are found wriggling slowly among aquatic plants. Females lay eggs attached to aquatic plants