2927) "Rough Toothed Dolphin", Australia: "Australian Dolphins Coin Series": The fifth $ 10 Gold and $1 Silver Coins depict this Dolphin found in warm and tropical waters around the world: Date/Year of Coin issue: 2023:
The Header/Banner showcases the Reverses and Obverses of the $10 (Ten Dollars - AUS) - Gold Coin and $1 (One Dollar - AUS) Silver Coin against a background representation of two Rough-toothed Dolphins frolicking in the waters in their habitat.
The Royal Australian Mint (RAM) has released new $10 (Ten Dollars) Gold and $1 (One Dollar) Silver Coins that mark the fifth release in this popular Series titled - “Australian Dolphins.”
The Coin Series, which promotes investment through Gold and Silver Bullion, features a different variety or sub-species every year.
For 2023, the design features an image of the rough-toothed variety.
About the Rough-toothed Dolphin:
The Rough-toothed Dolphin ("Steno bredanensis") is a species of dolphin that can be found in deep warm and tropical waters around the world.
In 1823, the species was first described by Georges Cuvier.
The genus name Steno, of which this species is the only member, comes from the Greek for 'narrow', referring to the animal's beak — which is a diagnostic characteristic of the species. The specific name recalls the work of van Breda, who studied Cuvier's writings. There are no recognised subspecies.
This species was formerly classified in the now-defunct subfamily Stenoninae, but more recent evidence has found that, despite its prominent bill, it in fact belongs with the blunt-nosed dolphins in the subfamily Globicephalinae.
The Rough-toothed Dolphin is a relatively large species, with adults ranging from 2.09 to 2.83 metres (6.9 to 9.3 ft) in length and weighing between 90 and 155 kilograms (198 and 342 lb.) - males are larger than females.
Its most visible characteristic feature is its conical head and slender nose - other dolphins either have a shorter snout or a more visibly bulging melon on the forehead.
As the common name for the species implies, the teeth are also distinctive, having a roughened surface formed by numerous narrow irregular ridges.
They have between nineteen and twenty-eight teeth in each quarter of the jaw. The rough-toothed dolphins jaw on the outside is very distinct. The colour of the lower jaw is usually white, but can have a hint of pink mixed in.
The flippers are set back further along the body than in other similar dolphins, although, at sea this dolphin may be confused with spinner, spotted and bottlenose dolphins.
The dorsal fin is pronounced, being from 18 to 28 centimetres (7.1 to 11.0 in) in height.
The animal's flanks are a light gray, while the back and dorsal fin are a much darker gray. Older individuals often have distinctive pinkish, yellow, or white markings around the mouth and along the underside.
As for the distribution and population of the Rough-toothed Dolphin, they inhabit the Pacific, Atlantic, and Indian Oceans, and in the Mediterranean Sea, in warm temperate to tropical waters, with occasional reports from cooler environments.
Rough-toothed dolphins can also be seen regularly in locations stretching from the Windward Islands to Cape Verde, but only a small handful have been seen in Azores and Madeira.
Live sightings are almost universally made far off-shore, beyond the continental shelf, in water at least 1 kilometre (0.62 mi) deep.
Most of the research activity concerning the dolphin has been directed in the Eastern Pacific, where a lsarge population estimated to have 175,000 individuals has been recorded.
Dolphins are found in oceans throughout the world, but more often, they favour deeper waters such as those found around and near Australia.
Far out to sea are Rough-toothed Dolphins, or Steno bredanensis, with their distinctive and overall appearance often described as quite primitive, akin to a prehistoric dolphin.
Named for the irregular ridges on their teeth, which are unique to their species, Rough-toothed dolphins are superficially similar in appearance to other dolphins, though the differences, such as their conical head and slender nose, are apparent on closer examination.
Like other dolphins, they live on a diet of squid and small fish. These elegant aquatic mammals are the most often encountered far beyond land, and though the rough-toothed dolphins are less well-known than, for instance, the familiar bottlenose dolphin, they nevertheless are just as sociable and have been frequently observed mixing and travelling with other oceanic dolphins.
Rough-toothed dolphins live in groups of up to 20 and exhibit similar behaviours as other dolphins, including occasional bow-riding of boats.
Population numbers are not accurately known, but this variety of dolphin is not believed to be threatened. However, they can fall victim to nets and hunting by fishermen, as well as to predation by sharks and killer whales.
The Coin:
The Reverse of the $1 (Silver) and $10 (Gold) Bullion Coins depict a rough-toothed Dolphin with its head emerging from the water and mouth open to show off its unusual teeth against a background of the sun on the horizon.
Overhead, another dolphin jumps out of the splashing sea and along the arch of the coin itself. On the upper left periphery is the text "ROUGH-TOOTHED DOLPHIN", along with the coins’ specifications placed on the lower periphery - "1 oz .9999 FINE GOLD or 1 oz .999 FINE SILVER".
The Obverse of the $1 (Silver) and $10 (Gold) Bullion Coins includes the right facing effigy designed by Jody Clark of Late Queen Elizabeth II (1926–2022), along with the years of her reign, "1952 and 2022". Below the Queen’s image is the denomination "100 DOLLARS" (Gold) or "1 DOLLAR" (Silver). The coins bear the year of issue as - "2023".
The specifcations of the two Bullion Coin Variants are:
i) The specifications of the Silver Coin are:
Country: Australia; Date/Year of Coin issue: 2023; Denomination: $1 (One Dollar - AUS); Coin Series Theme: "Australian Dolphins"; Metal Composition: .999 Fineness Silver (Ag); Weight: 1.00 Oz or 31.10 grams; Diameter/Size: 40.00 mm; Coin Quality: Brilliant Uncirculated (BU); Mint: Royal Australian Mint (RAM); Mintage: 25,000 pieces; Designer: Stevan Stojanovic.
ii) The specifications of the Gold Coin are:
Country: Australia; Date/Year of Coin issue: 2023; Denomination: $10 (Ten Dollars - AUS); Coin Series Theme: "Australian Dolphins"; Metal Composition: .9999 Fineness Gold (Au); Weight: 1.00 Oz or 31.10 grams; Diameter/Size: 38.70 mm; Coin Quality: Brilliant Uncirculated (BU); Mint: Royal Australian Mint (RAM); Mintage: 250 pieces; Designer: Stevan Stojanovic.
- Each of the Gold and Silver Coins is encapsulated and presented in a Royal Australian Mint-branded custom case with a Certificate of Authenticity (COA) and illustrated slipcase.
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