Family Busyconidae Higher classification Busycon | Superfamily Buccinoidea Tribe Busyconini Scientific name Busycon carica Rank Species | |
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Similar Busycon, Busycotypus canaliculatus, Sinistrofulgur perversum, Busycotypus, Austrolittorina antipodum | ||
Mornings with mindy knobbed whelk
The knobbed whelk (Busycon carica) is a species of very large predatory sea snail, or in the USA, a whelk, a marine gastropod mollusk in the family Busyconidae, the busycon whelks.
Contents
- Mornings with mindy knobbed whelk
- Knobbed whelk in sippican harbor
- Distribution
- Shell description
- Life habits
- Reproduction
- Human use
- References
The knobbed whelk is the second largest species of busycon whelk, ranging in size up to 12 in (305 mm).
Knobbed whelk in sippican harbor
Distribution
Knobbed whelks are native to the North Atlantic coast of North America from Cape Cod, Massachusetts to northern Florida. This species is common along the Georgia coast. It is the state shell of New Jersey and Georgia.
Shell description
The shell of most knobbed whelks is dextral, meaning that it is right-handed. If the shell is held in front of the viewer, with the spiral end up and the opening facing the viewer, the opening will be on the animal's right side. The shell is thick and strong and has six clockwise coils. The surface is sculpted with fine striations and there is a ring of knob-like projections protruding from the widest part of the coil. The color is ivory or pale gray, and the large aperture (the inside of the opening) is orange. The canal inside is wide and the entrance can be closed by a horny oval operculum.
Life habits
The knobbed whelk lives subtidally and is migratory, alternating between deep and shallow water, depending on the time of year.
During the weather extremes of the summer and winter months, these sea snails live in deep water, at depths of up to 48 m. In the milder weather of the spring and fall they live in shallow water, on near-shore or intertidal mud flats and sand flats.
On the shallow-water mud flats whelks prey on oysters, clams, and other marine bivalves. They wedge a bivalve open using the edge of their shell, and insert their long proboscis to eat the flesh of their victim. They rasp at the flesh using their radula, a rough tongue-like organ that has thousands of tiny denticles (tooth-like protrusions).
Reproduction
During the spring and fall migrations, mating and egg laying take place. The internally fertilized eggs are encased in a clear, gelatinous substance known as albumen and are deposited in durable, flattened, rounded capsules that link together to form a chain resembling a "Mermaid's Necklace". Each capsule typically houses 0 to 99 eggs, with the average string comprising 40 to 160 capsules. After laying their egg cases, female knobbed whelk will bury one end of the egg case into the substrate, thus providing an anchor for the developing fertilized eggs and preventing the string of egg cases from washing ashore where it would dehydrate. Fertilized eggs emerge as juvenile knobbed whelks approximately 4 mm in length.Human use
As with conchs, the knobbed whelk is used by humans as food in such dishes as salads (raw), burgers, fritters, and chowders.
As is also true of conch shells, the shell of the knobbed whelk can be made into a natural bugle by cutting off the tip of the spire in order to form a mouthpiece.
Historically, American Indians used the knobbed whelk as a component in wampum, the shell beads exchanged in the North American fur trade.