Definitions

whelk

whelk

[hwelk, welk]
whelk, large marine gastropod snail found in temperate waters. The whelk is sometimes eaten, but when food is plentiful, fishermen frequently use it for bait. Whelks are scavengers and carnivores, equipped with an extensible proboscis, tipped with a filelike radula, with which they bore holes through the shells of crabs and lobsters, and a large, muscular foot with which they hold their victims. The thick-lipped, spiral shell has an uneven surface with many protuberances. The knobbed whelk, the largest species, ranging up to 16 in. (40.6 cm), and the channeled whelk, slightly smaller, are both found south of Cape Cod, Mass. In summer the strings of pale, disk-shaped egg cases are common along the shore. The whelk is sometimes mistakenly called conch. Whelks are classified in the phylum Mollusca, class Gastropoda, order Neogastropoda.

Northern whelk (Buccinum undatum)

Any marine snail of the family Buccinidae, or a snail having a similar shell; found worldwide. Some whelks are called conchs. The sturdy shell of most species in the family is slender and has a wide opening in the first whorl. The animal feeds on other mollusks through its long proboscis; some species also kill fishes and crustaceans caught in commercial traps. Most are cold-water species; tropical species are smaller and more colourful. The common northern whelk (Buccinum undatum) has a stout pale shell about 3 in. (8 cm) long and is abundant in North Atlantic waters.

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A whelk is one of several species of large sea snails, marine gastropod mollusks found in temperate waters.

In North America, the common name whelk refers to several species of large, usually edible Busycon snails, marine gastropod mollusks in the family Melongenidae.

For information about the common European and northern Atlantic edible whelk, please see Buccinum undatum.

For information on various other marine snails which are sometimes known as whelks, please see articles on the taxonomic family to which they belong, see below.

Other sea snails called whelks

In English, "whelk" refers to various kinds of large (often edible) sea snails, but it is important to note that even though the same or similar common names may be used for all of these sea snails, the various different species of snail are often not at all closely related to one another. Some of these gastropods are so distantly related that they are not even in the same superorder as others.

In the British Isles and the Netherlands, where the word "whelk" seems to have originated, the word means Buccinum undatum and several related species in the family Buccinidae.

In some islands in the Caribbean, such as Saint Kitts and Nevis, the name whelks or "wilks" is used for a large edible top shell, Cittarium pica, also known as the magpie, or West Indian top shell, which is in the family Trochidae.

In the USA, a problematic introduced species is known as "Veined rapa whelk" or "Asian rapa whelk" (Rapana venosa). This species is in the family Muricidae, the murexes.

In Australia and New Zealand, species of the genus Cabestana in the family Ranellidae are called predatory whelks.

Shell description for Busycon whelks

Like other mollusks, whelks have a mantle, a thin layer of tissue located between the body and the shell that creates the shell. Whelks build their hard shells from the calcium carbonate they extract from seawater. The shells can grow up to 16 inches (40 cm) long.

Busycon whelk shells are generally cream, light grey or tan, and in one species the shell has brown and white streaks. The shells have a long siphonal canal, and most species coil dextrally (right-handed, or in a clockwise direction).

The lightning whelk, Busycon perversum, native to the waters of the southeastern United States and the Gulf of Mexico, is unusual among gastropods in that it normally produces a sinistral (left-handed) shell. The shell shape of individual specimens varies widely in both coloration and sculpture.

Life habits of Busycon whelks

Busycon whelks are found in temperate waters. They are scavengers and carnivores, equipped with an extensible proboscis that is tipped with a file-like radula. The radula is used to bore holes through the shells of barnacles, clams, crabs and lobsters. They also have a large, muscular foot with which they hold their victims. Small sharks, gulls, crabs, and other whelks are known to feed upon whelks.

The knobbed whelk, Busycon carica, is the second-largest species, ranging up to 12 in. (40.6 cm). They have tubercles (or spines) along the shoulder. Knobbed whelks eat clams. They open the clam with their hard shellstrong muscular foot and insert their long proboscis. The knobbed whelk is a common predator of the intertidal mudflats and as far offshore as 26 fathoms (48 m). The channeled whelk, Busycotypus canaliculatus, is slightly smaller than the knobbed whelk and has a smooth shell with a deep square channel which is continuous on all the whorls, just below the suture of the shell.

Busycon whelk egg cases

Strings of Busycon whelk egg capsules fairly often wash up, and can dry out on the beach, becoming brittle. These objects are sometimes referred to as "mermaid's necklaces", because they resemble a large necklace strung with medallion-shaped egg pouches. Each pouch of the "necklace" contains a large number of baby whelks, similar in appearance to adults except that the baby shell, or protoconch, has far fewer whorls and less sculpture than the adult.

Busycon whelks as food

Another name for whelk (as a food source) in the United States is scungilli. The name is an Italian-American adaptation of the Neapolitan word "sconciglio".

References

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