Have you tried something like 

http://api.gbif.org/v1/species/search?datasetkey=d7dddbf4-2cf0-4f39-9b2a-bb099caae36c&rank=GENUS

where datasetkey=d7dddbf4-2cf0-4f39-9b2a-bb099caae36c is for the GBIF backbone taxonomy

Scott

On Wed, Sep 6, 2017 at 2:10 PM Szlamka József <szlajozs@gmail.com> wrote:
Hello to all list members,

I'm new on this list and also new to the GBIF API. I'd like to get a
list of all the genus names occuring in the GBIF database. After several
hours of trying with the API, and no success, I found this mailing list.
I hope that API guru members on the list can show me the right way or
tell if this is not possible at all.

Thank you in advance.

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