Return the feature with the GML ID of 'F6__28751':
http://79.125.16.106/ArcGIS/services/IUCN_Secure/Species_WGS84/MapServer/WFSServer?request=GetFeature&featureid=SpeciesRangeMaps.F6__28751...Return all features with the species ID_NO of '8541'. This uses the ogc:filter specification (this is urlencoded):
http://79.125.16.106/ArcGIS/services/IUCN_Secure/Species_WGS84/MapServer/WFSServer?request=GetFeature&typeName=SpeciesRangeMaps&filter=...