Is it possible to use the GBIF API to convert GBIF taxon ids (e.g. 6459778, from http://www.gbif.org/species/6459778) for taxa that have originally been obtained from WoRMS, to their original WoRMS IDs (in this case 431166, see http://www.marinespecies.org/aphia.php?p=taxdetails&id=431166). Yan