Question about pleco's

I see pleco's with a number begining with a L. What is the l and number about and were can I fine more info about this.

Thanks Rick

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does a pretty good job

Here is a good link for people just learning about L numbers. It gives a lot of the L numbers History.
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Use [You must be registered and logged in to see this link.] to look up any L numbers you find and to read a lot of info on all catfish in general.