Acanthocephala n. pl. : A group of intestinal worms, having the proboscis armed with recurved spines.

Example:
What are the recorded helminth parasites from the green toad Bufo viridis?

Taxonomy
proboscis, Acanthocephala, Acanthocephalans, life cycle, body, worm, parasite, embryos, hooks, Gammarus lacustris, body cavity, spp, acanthocephalan, duck, bell, skin, serotonin, cavity.

Defination from the web:
Acanthocephala (Greek ακανθος, akanthos, thorn + κεφαλη, kephale, head) is a phylum of parasitic worms known as acanthocephales, thorny ... Gnathifera: Rotifera · Acanthocephala · Gnathostomulida · Micrognathozoa · Cycliophora. Lophotrochozoa ...