Hi @thermokarst,
I tested
--p-front CCTACGGGNGGCWGCAG...GGATTAGATACCCBDGTAGTC
and
--p-adapter CCTACGGGNGGCWGCAG...GGATTAGATACCCBDGTAGTC
and both worked!
I also played around with "anchoring" the primers using something like this:
--p-front ^CCTACGGGNGGCWGCAG...GGATTAGATACCCBDGTAGTC$
which resulted in trimming of less sequences.
I am still figuring out the consequences of anchoring, but it is quite well explained in the cutadapt docs here and here and I think I am getting there...
Thanks for forwarding the issues with the documentation and filtering of untrimmed sequences!
Cheers,
Martin