Incertae sedis

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

Incertae sedis (Latin for 'of uncertain placement') or problematica is a term used for a taxonomic group whose broader relationships are unknown or undefined. Alternatively, such groups are frequently referred to as "enigmatic taxa".

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

Image: TSkaff, CC BY-SA 4.0, via Wikimedia Commons.