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In the broadest sense, shellfish means all molluscs with a pair of shells (see
Bivalves). With this understanding, it is more appropriate to call it shellfish and
commensurate with the meaning of clam used in America. Examples of such usage
can be seen in the term "craft from shells.
The word shell can also mean all the shells whose life is attached to an object.
These include edible species, such as shellfish and green shell (kupang awung), but
do not include edible species but lying on sand or bottom waters, such as lokan and
mussels.
Shellfish are also used to refer to a variety of shell-shelled thick, calcareous, with a
radial pattern on a firm shell. In this sense, green shells are not included and more
properly called kupang. The closest understanding in English is cockle.
In the most narrow sense, what is referred to as mussels are blood clams (Anadara
granosa), a type of common cultivation shells found in the Indo-Pacific region and
sold in many stalls or restaurants selling seafood.
