Demosponge

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

Demosponges or common sponges are sponges of the class Demospongiae (from Ancient Greek: δῆμος, romanized: dêmos, lit. 'common people' + σπογγιά, spongiá, 'sponge'), the most diverse group in the phylum Porifera which include greater than 90% of all extant sponges with nearly 8,800 species worldwide (according to the World Porifera Database).

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

Image: Albert Kok, CC BY-SA 3.0, via Wikimedia Commons.