On December 4, 2009, the Philippine Postal Corporation (Philpost) came out with an issue on Philippine Marine Biodiversity featuring Sea Slugs of the Philippines or Nudibranchs.
The beautiful block of 4 stamps are all priced at 7 pesos each and highlight Hypselodoris apolegma, Glossodoris colemani, Chromodoris sp. and Chromodoris elisabethina.
The souvenir sheet valued at 7 pesos each include the Jorunna Funebris, Chromodoris lochi, Noumea alboannulata, Chromodoris hintuanesis, Risbechi tryoni, and Chromodoris leopardus.
This issue is a great addition to those who collect stamps on marine life.