Acanthocephala

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

Acanthocephala (Greek ἄκανθος, akanthos 'thorn' + κεφαλή, kephale 'head') is a group of parasitic worms known as acanthocephalans, thorny-headed worms, or spiny-headed worms, characterized by the presence of an eversible proboscis, armed with spines, which it uses to pierce and hold the gut wall of its host.

Excerpt from the Wikipedia article “Acanthocephala”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Dr. Neil Campbell, University of Aberdeen, Scotland, UK, Public domain, via Wikimedia Commons.