Opisthonema

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

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At a glance

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Knowledge cost

1

Influence

1

Resistance

3

In collections

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What Wikipedia says

Opisthonema is a genus of herrings, the thread herrings, found in tropical waters of the Western Hemisphere. They get their name from a filamentous nature of the last ray of the dorsal fin. Currently, five species are in this genus.

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

Image: SEFSC Pascagoula Laboratory; Collection of Brandi Noble, NOAA/NMFS/SEFSC, Public domain, via Wikimedia Commons.