L104 is not gone entirely it is just no longer considered P. Maccus, L104 is to be considered as the so called common Bristlenose a mix where the original catch locations where never recorded and species looking so similar where bred for tthe aquarium trade.
Im not sure what the original "Pretty pekoltia" was but i would imagin it to be the same as what oz call's
"clown pleco" L168, L52, L104, & P. Maccus.