Spiny Lobster Quarter Crown Turks and Caicos Authentic Coin Money for Jewelry and Craft Making (1981) (Sea Crayfish) (Langusta)

Spiny Lobster Quarter Crown Turks and Caicos Authentic Coin Money for Jewelry and Craft Making (1981) (Sea Crayfish) (Langusta)

Reverse: Spiny lobster on rock surrounded by legend
Lettering: TURKS AND CAICOS ISLANDS
·QUARTER CROWN·

Obverse: Crowned portrait of Queen Elizabeth right surrounded by legend and date
Lettering: ELIZABETH II D.G.REGINA
1981

Edge: Reeded

Features
Issuer Turks and Caicos Islands
Queen Elizabeth II (1952-date)
Type Standard circulation coin
Year 1981
Value 1/4 Crown = 1/4 Dollar (0.25)
Currency Crown (1969-date)
Composition Copper-nickel
Weight 5.7 g
Diameter 24.3 mm
Shape Round
Orientation Medal alignment ↑↑
Demonetized 1986
Number N# 14067
References KM# 51

Wikipedia:
Spiny lobsters, also known as langustas, langouste, or rock lobsters, are a family (Palinuridae) of about 60 species of achelate crustaceans, in the Decapoda Reptantia. Spiny lobsters are also, especially in Australia, New Zealand, Ireland, South Africa, and The Bahamas, called crayfish, sea crayfish, or crawfish ("kreef" in South Africa), terms which elsewhere are reserved for freshwater crayfish.

Although they superficially resemble true lobsters in terms of overall shape and having a hard carapace and exoskeleton, the two groups are not closely related. Spiny lobsters can be easily distinguished from true lobsters by their very long, thick, spiny antennae, by the lack of chelae (claws) on the first four pairs of walking legs, although the females of most species have a small claw on the fifth pair, and by a particularly specialized larval phase called phyllosoma. True lobsters have much smaller antennae and claws on the first three pairs of legs, with the first being particularly enlarged.

Sound
Many spiny lobsters produce rasping sounds to repel predators by rubbing the "plectrum" at the base of the spiny lobster's antennae against a "file". The noise is produced by frictional vibrations – sticking and slipping, similar to rubber materials sliding against hard surfaces. While a number of insects use frictional vibration mechanisms to generate sound, this particular acoustic mechanism is unique in the animal kingdom. Significantly, the system does not rely on the hardness of the exoskeleton, as many other arthropod sounds do, meaning that the spiny lobsters can continue to produce the deterrent noises even in the period following a moult when they are most vulnerable. The stridulating organ is present in all but three genera in the family (Jasus, Projasus, and the furry lobster Palinurellus), and its form can distinguish different species.