A marine horsehair worm, Nectonema sp., parasitizing atelecyclid crab, Erimacrus isenbeckii, from Hokkaido, Japan.
D000818:Animals; D001699:Biometry; D003386:Brachyura / Q000469:parasitology*; D005260:Female; D006376:Helminths / Q000033:anatomy & histology*; D007564:Japan; D008297:Male