Fig. 1.

Echinostoma miyagawai from a Pitalah duck in Aceh Province, Indonesia. (A) An adult worm showing its characteristic head collar with collar spines, oral and ventral suckers, uterus with eggs, cirrus sac, ovary, Mehlis’ gland, testes, and vitelline follicles. Acetocarmine-stained. Ventral view. Scale bar=0.72 mm. (B) Head collar equipped with 37 collar spines. Acetocarmine-stained. Ventral view. Scale bar=100 μm. (C) Line drawing of the head collar with 37 collar spines. Scale bar=100 μm.