According to the docs I should be able to get the type specimens for a species using:

http://api.gbif.org/v1/species/5231190/typeSpecimens (the example given on http://www.gbif.org/developer/species )

But this returns

{"offset":0,"limit":20,"endOfRecords":true,"results":[]}

This species has A LOT of types, see http://www.gbif.org/species/5231190, so something seems amiss...

Regards,

Rod