Bunostomum trigonocephalum  
Fig. 1: Anterior end, showing buccal capsule containing teeth and a pair of cervical papillae
Fig. 2: Posterior end of male, showing spicules and arrangement of rays in bursa
Fig. 3: Posterior region of female, showing opening of anus (a pair of papillae is also visible just near to tip)
Fig. 4: Vulvar opening in female
Fig. 5: Egg