Depth range based on 4 specimens in 1 taxon.

Environmental ranges
  Depth range (m): 3.5 - 21

Graphical representation

Depth range (m): 3.5 - 21
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Hexaplex trunculus

The following is a representative barcode sequence, the centroid of all available sequences for this species.

There is 1 barcode sequence available from BOLD and GenBank.

Below is the sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.

See the BOLD taxonomy browser for more complete information about this specimen.

Other sequences that do not yet meet barcode criteria may also be available.

-- end --

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Source: Barcode of Life Data Systems (BOLD)


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Statistics of barcoding coverage: Hexaplex trunculus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 2
Species With Barcodes: 1
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© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)


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Hexaplex trunculus

Hexaplex trunculus (also known as Murex trunculus or the banded dye-murex) is a medium-sized species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex shells or rock snails.

This species of sea snail is important historically because its hypobranchial gland secretes a mucus that the ancient Canaanites/Phoenicians used as a distinctive purple-blue indigo dye. One of the dye's main chemical ingredients is dibromo-indigotin, and if left in the sun for a few minutes before becoming fast, its color turns to a blue indigo (like the dye used in blue jeans).


Distribution map of Hexaplex trunculus

This species lives in the Mediterranean Sea and the Atlantic coasts of Europe and Africa, specifically Spain, Portugal, Morocco, the Canary Islands, Azores.[1]

This murex occurs in shallow, sublittoral waters.

Shell description[edit]

Hexaplex trunculus has a broadly conical shell about 4 to 10 cm long. It has a rather high spire with seven angulated whorls. The shell is variable in sculpture and coloring with dark banding, in four varieties. The ribs sometimes develop thickenings or spines and give the shell a rough appearance.

Apertural view of a shell
Dorsal view of a shell

Human use[edit]

Secretions from this species of snail were used as dye in ancient times. The snail itself is still used as a valuable food source in Portugal.[2]

As ancient dye[edit]

Carthaginian Murex pigment from Tunisia

The ancient method for mass-producing purple-blue dye from Hexaplex trunculus has not yet been successfully reproduced (because the purplish hue degrades too quickly, resulting in blue only). Nonetheless the use of this species in dyeing "purple-blue" has been confirmed in the archeology of Phoenicia, where large quantities of the shells have been recovered from inside ancient live storage chambers that were used for harvesting. Allegedly, 10-12,000 murex were needed to produce one gram of dye. The dye was highly prized in ancient times. Sometimes known as royal blue, it was prohibitively expensive and was only used by the highest ranking aristocracy.

A similar dye, Tyrian purple, which is purple-red in color, was made from a related species of marine snail, Murex brandaris. This dye (alternatively known as imperial purple, see purple) was also prohibitively expensive.

As dye in Judaism[edit]

Some wool dipped in tekhelet solution, from the Hexaplex trunculus, turning blue in the sunlight outside P'til Tekhelet in Israel.

The Hebrew Bible mentions a specific blue dye, called Tekhelet (Hebrew: תְּכֵלֶת‎, pronounced [ˈtχelet]) for use in the Priestly garments as well in the layman's tzitzit, the formal tassels or fringes of clothing, which some believe refers to the indigo dye from the Hexaplex trunculus when kept in the sun.[3]

Similarly, the Hebrew Bible also mentions a specific purple dye, called argaman (Hebrew: אַרְגָּמָן[ʔaʁɡaˈman]), which may refer to the purple color this same dye produces when kept in the shade.

That is, research by Otto Elsner (Shenker College of Fibers, Ramat Gan, Israel) and Ehud Spaneir (University of Haifa, Haifa, Israel) showed that by performing what is commonly referred to as "vat dyeing" based on the dyestuff from the trunculus, they could achieve colors varying from blue to purple depending on exposure to the sun when the dye solution was in its leuco (reduced) state. This phenomenon was attributed to the dyestuff being composed of indigo, mono-bromo-indigo and di-bromo-indigo.[citation needed] Dibromo-indigo presents itself as purple whereas indigo is blue. It was demonstrated that when the reduced solution of trunculus dye is exposed to sunlight, the UV-rays from the sun act to break the bromine bonds such that when oxidation occurs following the removal of the dyed fabric from the solution, pure indigo bonds to the wool, while the bromine atoms are left in the vat.

This feature of final color varying according to exposure to the sun was indeed known by the ancients, as noted in the writings of Vitruvius (1 c. BCE), “Purple exceeds all colors in costliness and superiority of its delightful effect. It is obtained from a marine shellfish. ...It has not the same shade in all the places where it is found, but is naturally qualified by the course of the sun”.[4]

See also[edit]


  1. ^ a b Houart, R.; Gofas, S. (2009). "Hexaplex trunculus (Linnaeus, 1758)". In Bouchet, P.; Gofas, S.; Rosenberg, G. World Marine Mollusca Database. World Register of Marine Species. Retrieved 2010-05-05. 
  2. ^ Vasconcelos, P.; Carvalho, S.; Castro, M.; Gaspar, M. B. (2008). "The artisanal fishery for muricid gastropods (banded murex and purple dye murex) in the Ria Formosa lagoon (Algarve coast, southern Portugal)" (pdf). Scientia Marina 72 (2): 287–298. doi:10.3989/scimar.2008.72n2287. 
  3. ^ Ptil Tekhelet Organization
  4. ^ Vitruvius, M. (1960). The Ten Books on Architecture. New York: Dover Publications. pp. 1–331. ISBN 978-0486206455. 

Further reading[edit]

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