Pinctada

Pinctada
	Shell of Pinctada margaritifera on display at Muséum de Toulouse
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Pterioida
Superfamily:	Pterioidea
Family:	Pteriidae
Genus:	Pinctada; Röding, 1798
Species
	See text

Pinctada is a genus of saltwater oysters, marine bivalve mollusks in the family Pteriidae, the pearl oysters. These oysters have a strong inner shell layer composed of nacre, also known as "mother of pearl".

Pearl oysters are not closely related to either the edible oysters of family Ostreidae or the freshwater pearl mussels of the families Unionidae and Margaritiferidae.

P. margaritifera and P. maxima are used for culturing South Sea and Tahitian pearls. They are cultured widely primarily in the central and eastern Indo-Pacific. A pearl oyster can be seen on the reverse side of the 1,000-peso bill of the Philippines.

Species of commercial value

All species within the genus produce pearls. Attempts have been made to harvest pearls commercially from many Pinctada species. However, the only species that are currently of significant commercial interest are:

Gulf pearl oyster, Pinctada radiata; Persian Gulf,^[2] Red Sea, Mediterranean Sea and throughout the Indo-Pacific as far as Japan and Australia.
Black-lip oyster, Pinctada margaritifera; Persian Gulf and southwestern part of Indian Ocean; Fiji; Tahiti; Myanmar; Baja California; Gulf of Mexico
Gold-lip oyster, Pinctada maxima; Australia; Fiji; Tahiti;
White-lip oyster, Pinctada maxima; Australia; Fiji; Tahiti; Myanmar;
Pinctada mazatlanica; Mexico; Panama;
Akoya pearl oyster, Pinctada fucata (also called P. imbricata), Red Sea; Sri Lanka; Persian Gulf; Indian Ocean; Western Pacific Ocean; Australia; China; Venezuela;
Shark Bay pearl oyster Pinctada albina; Australia

The various species of Pinctada produce different maximum sizes and colors of pearls, depending on the size of the species and the natural color of the nacre inside the shell. Black South Sea pearls, or Tahitian pearls come from the black-lip oyster; white and golden South Sea pearls from the white-lip and golden-lip oysters; and Akoya cultured pearls from Pinctada fucata martensii, the Akoya pearl oyster.

Pearls are also obtained in commercial quantities from some species of the closely related winged oyster genus Pteria.

Pearls are also produced from freshwater mussel species unrelated to pearl oysters. These freshwater species include Hyriopsis cumingii, Hyriopsis schlegelii, and a hybrid of the two species.

At danger from the large demand for pearls, the typical lifespan of a pearl oyster is usually around 3 years to 14 years. Pinctada maxima are seeded at about 2 years of age and take 2 years to fully develop a pearl. They can be reseeded up to 3 or 4 times. Akoya pearls are harvested after about 9 to 16 months.

Research carried out by biologist Aldemaro Romero Jr. allowed him to discover that the first animal population depleted by Europeans in the American continent was a pearl oyster species (Pinctada imbricata) off the coast of Venezuela. He analyzed historical records and used information about the biology of these and other species to explain its rapid disappearance.

File:New PHP1000 Banknote (Reverse).jpg

The Philippine Pearl Oyster as seen on the reversed side of a 1,000 Peso Banknote

Species list

The World Register of Marine Species includes the following species in the genus:^[1]

Pinctada albina (Lamarck, 1819) – Shark Bay pearl oyster
Pinctada capensis (Sowerby III, 1890)
Pinctada chemnitzii (Philippi, 1849)
Pinctada cumingii (Reeve, 1857)
Pinctada fucata (Gould, 1850) – Akoya pearl oyster – now accepted as Pinctada imbricata fucata
Pinctada galtsoffi Bartsch, 1931
Pinctada imbricata Röding, 1798 – Gulf pearl oyster
Pinctada inflata (Schumacher, 1817)
Pinctada longisquamosa (Dunker, 1852)
Pinctada maculata (Gould, 1850)
Pinctada margaritifera (Linnaeus, 1758) – Black-lip oyster
Pinctada maxima (Jameson, 1901) – White-lip oyster or gold-lip oyster
Pinctada mazatlanica (Hanley, 1856)
Pinctada nigra (Gould, 1850)
Pinctada petersii (Dunker, 1852)
Pinctada radiata (Leach, 1814) – Atlantic pearl-oyster – now accepted as Pinctada imbricata radiata
Pinctada reeveana (Dunker, 1872)
Pinctada sugillata (Reeve, 1857)
Pinctada vidua (Gould, 1850)

References

^ ^a ^b Bouchet, Philippe (2014). "Pinctada Röding, 1798". WoRMS. World Register of Marine Species. Retrieved 2014-02-15.
^ "Sympatric morphological and genetic differentiation of the pearl oyster Pinctada radiata (Bivalvia: Pterioida) in the northern Persian Gulf". Journal of the Marine Biological Association of the United Kingdom. Volume 95, Issue 3: 537–543. 2015. doi:10.1017/S0025315414001611. {{cite journal}}: |volume= has extra text (help); Italic or bold markup not allowed in: |journal= (help); Unknown parameter |authors= ignored (help)

External links

Media related to Pinctada at Wikimedia Commons

OBIS Indo-Pacific molluscan database entry for Pinctada

[WoRMS-1] Bouchet, Philippe (2014). "Pinctada Röding, 1798". WoRMS. World Register of Marine Species. Retrieved 2014-02-15.

[2] "Sympatric morphological and genetic differentiation of the pearl oyster Pinctada radiata (Bivalvia: Pterioida) in the northern Persian Gulf". Journal of the Marine Biological Association of the United Kingdom. Volume 95, Issue 3: 537–543. 2015. doi:10.1017/S0025315414001611. {{cite journal}}: |volume= has extra text (help); Italic or bold markup not allowed in: |journal= (help); Unknown parameter |authors= ignored (help)

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