Republic of the Philippines - Stamps & Postal History


RP Issues of 2010











2010, December 1.  Philippine Marine Biodiversity - Definitive 

Litho Offset.  Amstar Company, Inc.  Perf. 13.5

Singles, Sheets of 50  (5 x 10)






   100p   Blue-ringed Octopus  - Singles   (265,000)


Design Coordinators:  Victorino Z. Serevo;  Elenita D.L. San Diego

Source:  Coral Reef Animals of the Indo-Pacific by Dr. Terence Gosliner


First Day Covers:  Manila



Blue-Ringed Octopus (Hapalochlaena maculosa)

With its fascinating coloring and delicate curling arms, the blue-ringed octopus may be a beautiful creature, but this small cephalopod is also deadly. When agitated its 50 or 60 bright blue rings appear and pulsate with color, as a warning. Inside the salivary glands of the blue-ringed octopus live colonies of bacteria that produce tetrodotoxin, the potent neurotoxin found in pufferfish and other animals. A can completely paralyze and kill an adult human in a matter of minutes. There is no known antidote. The octopus itself is not affected at all by the toxin.

The blue-ringed octopus is commonly found in shallow, sandy areas. It is most active after dark, and spends most of its day hidden in its nest. Like all octopods, the blue-ringed octopus has no skeleton and is thus very flexible and maneuverable. It can squeeze into tiny crevices and make dens in bottles, aluminum cans, or mollusk shells. The blue-ringed octopus is also known to burrow into sand or gravel to conceal itself.
The blue-ringed octopus feeds primarily on crabs and mollusks, ambushing from behind and enveloping prey with its eight arms. Using its bird-like beak, the octopus bites a hole through its victimís shell to inject toxic saliva. With its arms and beak, the creature tears soft pieces from the prey, sucking the rest of the meat from the shell once it becomes partially digested by the saliva.

Packets of sperm rest in the grooved tip of the maleís modified third arm, called a hectocotylus. When mating, the male slips this grooved tip under the mantle and into the oviduct of the female through a gill slit, and transfers multiple sperm packets, or spermatophores. The female lays her eggs in several unattached clumps, which she carries in her arms until they hatch. After the young emerge from their eggs, the mother dies. (



  • Marine Biodiversity

  • Marine Life


Articles by Dr. Ngo Tiong Tak



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Issues of 2010