''Turbinella pyrum'',

common name In biology, a common name of a taxon or organism (also known as a vernacular name, English name, colloquial name, country name, popular name, or farmer's name) is a name that is based on the normal language of everyday life; and is often contrast ...

s the chank shell, sacred chank or chank, also known as the divine conch, sometimes referred to simply as a

conch Conch () is a common name of a number of different medium-to-large-sized sea snails. Conch shells typically have a high spire and a noticeable siphonal canal (in other words, the shell comes to a noticeable point at both ends). In North Am ...

, is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of very large

sea snail Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...

with a

gill A gill () is a respiratory organ that many aquatic organisms use to extract dissolved oxygen from water and to excrete carbon dioxide. The gills of some species, such as hermit crabs, have adapted to allow respiration on land provided they are ...

and an operculum, a marine

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...

in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Turbinellidae Turbinellidae are a family of sea snails, marine gastropod mollusks in the clade Neogastropoda. Members of this family are predators. Distribution Species in this family are found worldwide, mostly in tropical shallow waters but some in deep wa ...

. This species occurs in the

Indian Ocean The Indian Ocean is the third-largest of the world's five oceanic divisions, covering or ~19.8% of the water on Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia to the east. To the south it is bounded by th ...

. The name "chank" for the shell of this species is derived from the Indian word ''

shankha A Shankha ( conch shell) has religious ritual importance in Hinduism. It is the shell of any suitable sea snail which had a hole made for the performer's embouchure. In Hindu history, the shankha is a sacred emblem of The Hindu preserver god V ...

'', the divine conch. The old generic name was ''Xancus''. The Dutch used to call them ''chianco''.

Distribution

This species is found mainly in the

Description

The shell of this species is massive, with three or four prominent columellar plicae. It is usually pure white under a heavy brown periostracum, but it can also be a pale

apricot An apricot (, ) is a fruit, or the tree that bears the fruit, of several species in the genus ''Prunus''. Usually, an apricot is from the species '' P. armeniaca'', but the fruits of the other species in ''Prunus'' sect. ''Armeniaca'' are also ...

color. It can sometimes be dotted with dark brown. Shells of the

lightning whelk ''Sinistrofulgur perversum'', the lightning whelk, is an edible species of very large predatory sea snail or whelk, a marine gastropod mollusc in the family Busyconidae, the busycon whelks. This species has a left-handed or sinistral shell. It ...

(''Sinistrofulgur sp.''), a normally left-handed western

Atlantic Ocean The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe ...

genus, are sometimes sold in imitation of the rare left-handed shells of the ''Turbinella'' species.,

Human use

The shell has considerable significance in

Hinduism Hinduism () is an Indian religion or '' dharma'', a religious and universal order or way of life by which followers abide. As a religion, it is the world's third-largest, with over 1.2–1.35 billion followers, or 15–16% of the global p ...

and

Buddhism Buddhism ( , ), also known as Buddha Dharma and Dharmavinaya (), is an Indian religion or philosophical tradition based on teachings attributed to the Buddha. It originated in northern India as a -movement in the 5th century BCE, and gra ...

. It is considered to be sacred and is one of the

eight auspicious symbols The Ashtamangala is a sacred suite of ''Eight Auspicious Signs'' endemic to a number of religions such as Hinduism, Jainism, and Buddhism. The symbols or "symbolic attributes" () are yidam and teaching tools. Not only do these attributes (or en ...

. In these religious contexts, the shell is sometimes modified by having the tip of the

spire A spire is a tall, slender, pointed structure on top of a roof of a building or tower, especially at the summit of church steeples. A spire may have a square, circular, or polygonal plan, with a roughly conical or pyramidal shape. Spires are ...

cut off, so it can be blown as a ceremonial

trumpet The trumpet is a brass instrument commonly used in classical and jazz ensembles. The trumpet group ranges from the piccolo trumpet—with the highest register in the brass family—to the bass trumpet, pitched one octave below the standard ...

. Some shells used in this way are decorated with metal and semiprecious stones. Like most other gastropods, the shell of this species is almost always right-handed, or dextral, in its shell-coiling, but very rarely a left-handed shell is found (one in approximately 200,000 individuals). In the Hindu religious context, the very rare left-handed (sinistral) shells of this species are known as ''

Dakshinavarti Shankh Dakshinavarti shankha (), also referred to as Valampuri shankhu () and Sri Lakshmi shankha () is a sacred Hindu conch. It refers to the shell of a large sea snail from the Indian Ocean (a shell of the species ''Turbinella pyrum''), but one that has ...

'' in Sanskrit or ''Valampurich chanku'' in Tamil, as opposed to the more common right-handed forms, which are known as ''Vamavarti''. The ''Dakshinavarti'' is particularly highly valued in terms of its religious significance. In its religious context, the ''Dakshinavarti shankh'' is considered to be right-handed, because the "handedness" of the shell coiling is measured with the "spout" or

siphonal canal The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is ...

of the shell pointing upwards. This is the opposite orientation to that which students of

malacology Malacology is the branch of invertebrate zoology that deals with the study of the Mollusca (mollusks or molluscs), the second-largest phylum of animals in terms of described species after the arthropods. Mollusks include snails and slugs, clams, ...

use when assigning "handedness" to a shell.

References

External links

* Photo of a shell with periostracum and operculum

* A dextral and a sinistral shell of the species

{{Taxonbar, from=Q1280922 Turbinellidae Gastropods described in 1758 Taxa named by Carl Linnaeus

Distribution

Description

Human use

See also

References

Further reading

External links