L-number

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The L-number system is a semi-scientific classification system of catfish based on photographs of shipments of tropical catfish of the family Loricariidae published by the aquarium magazine DATZ (Die Aquarien und Terrarienzeitschrift).

An L-number is not an official scientific name, but it does allow people to identify various Loricariid catfish by a "common name" before the fish is actually officially described. When a Loricariid receives an official scientific name, the L-number is retired.

Baryancistrus L-18 is also described as L-85.
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Baryancistrus L-18 is also described as L-85.

In general a specific L-number classification does not guarantee a discrete species—multiple L numbers have been given to different populations of the same species.

Additionally the aquarium magazine 'Das Aquarium' introduced a similar system using the prefix 'LDA'.

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