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Answers 
1.
What does the term Cnumbers mean


In 1993 HansGeorg Evers a
German aquarist and a leading light in the aquarist
world implemented this code for the German magazine
DATZ due to the many undescribed species that were
entering the hobby without any name.
These number codes (C for Corydoras)
meant that the whole aquarist world would know what
each specimen was as it will be many years before
these code number species will be described to science.
When any Cnumber is described the corresponding number
will be retired.




2.
What does the term CWnumbers mean

A.

DATZ stopped
this coding system with C159 but there were still unidentified
species still arriving in the hobby so in 2006 Ian Fuller
who runs the corydoradinae website, www.corydorasworld.com
decided to carry on with this same coding method with
his CW (Corydorasworld) numbers. The latest number as
of February 2019 is CW154.
The CW number system is mainly internet
based and is published through his site. When
any CWnumber is described the corresponding number will
be retired. 



3.
What does the term Lnumbers mean


Again the german DATZ magazine
was at the forefront of introducing the Lnumber code
due to the many undescribed species that were entering
the hobby without any name. It was the December edition
of 1988 that Rainer Stawikowski first introduced the
Lnumbers, L of course standing for Loricariidae.
As of February 2019 the number
stands at an incredible 513.
When any Lnumber is described the corresponding number
will be retired. 



4.
What does the term LDAnumbers mean

A.

This code number
system was put in place by the the German aquarium magazine,
Das Aquarium, the LDA standing for Loricariidae Das
Aquarium. This system was supposed to run alongside
the Lnumber classifications but this magazine closed
in 2005 and the last LDA number was LDA102.
When any LDAnumber is described the corresponding number
will be retired.
