Chinese pond turtle | |
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Non-native M. reevesii in East Timor | |
Melanistic male | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Reptilia |
Order: | Testudines |
Suborder: | Cryptodira |
Superfamily: | Testudinoidea |
Family: | Geoemydidae |
Genus: | Mauremys |
Species: | M. reevesii |
Binomial name | |
Mauremys reevesii | |
Synonyms [3] | |
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Mauremys reevesii, commonly known as the Chinese pond turtle, the Chinese three-keeled pond turtle, or Reeves' turtle, is a species of turtle in the family Geoemydidae, a family which was formerly called Bataguridae. [2] The species is native to East Asia.
It is one of the two most commonly found species used for divination that have been recovered from Shang dynasty sites. [4]
While the species typically appears to have a brown shell, dark grey skin, with yellow markings on the neck and yellow irises, melanism is well documented in males, where the entirety of the animal including the eyes becomes completely black and the yellow markings are lost. Melanism only occurs in mature males over 7 years old. Old females may sometimes also develop darker shells and fewer markings. [5]
Certain populations of Reeve's turtles may exhibit megacephaly. Megacephalic turtles have much larger and broader heads, and hypertrophied jaws muscles. [6] In at least one other species of turtle, it appears that megacephaly may not be genetically linked, instead developing in individuals as a response to a heavily durophagous diet. [7]
Mauremys reevesii is native to China and Korea, and is thought to have been introduced to Japan and Taiwan in historic times; it was previously thought to be native to both these regions. The species is thought to have been introduced to Japan from the Korean Peninsula near the end of the 18th century. Introduced populations of M. reevesii may serve as a threat to the native turtles of these regions due to its propensity for hybridization. [2] [8] [9] [10]
During surveys in East Timor (Timor-Leste), a small but well-established population of M. reevesii was found living in marshes near the city of Dili. The species is not native to the island and was possibly introduced by locals of Chinese origin. [11] East Timor is home to the Roti Island snake-necked turtle (Chelodina mccordi), more specifically the subspecies C. m. timorensis (sometimes considered a species of its own). Although the introduced population of M. reevesii is not known to present a risk to the native turtles per se , they could indirectly present a threat to the natives if confused. M. reevesii from the introduced population are sometimes captured to be sold to people of Chinese origin and this may cause problems if extended to the native turtles. [11] A potential solution is to remove the introduced M. reevesii (thereby restricting the trade to captive farmed M. reevesii). [11]
M. reevesii is semiaquatic, and basks in the sun on rocks or logs and can often be found leaving water to do so. They can usually be found in marshes, relatively shallow ponds, streams, and canals with muddy or sandy bottoms.
The Chinese three-keeled pond turtle (M. reevesii) is threatened by competition with released pet red-eared sliders (Trachemys scripta elegans), overhunting (its plastron is used in traditional Chinese medicine), [12] [13] capturing for the pet trade, and wild habitat destruction. The IUCN considers M. reevesii an endangered species. [8] This species, fortunately, breeds well in captivity. [10]
The specific name, reevesii, is in honor of English naturalist John Reeves. [14]
This species, Mauremys reevesii, is notorious for its ability to produce hybrids with other Geoemydidae, even species that are only distantly related. The supposed new species " Mauremys pritchardi " was based on a hybrid of unknown origin between a male of this species and a female yellow pond turtle (Mauremys mutica). Furthermore, it has hybridized with the Chinese stripe-necked turtle (Ocadia sinensis), female Malayan box turtles (Cuora amboinensis), a male four-eyed turtle (Sacalia quadriocellata), and the Japanese pond turtle (Mauremys japonica) in captivity. [15] [16] This hybridization may pose a threat to the populations of native M. mutica and Chinese stripe-necked turtle (M. sinensis) in Taiwan, and the endemic M. japonica in Japan. [10]
Any individuals that are available as pets therefore need to be kept separate from other members of the family.
High demand for turtle plastrons for Shang divination rites and archaeological findings of large caches of turtle shells has led some scholars to speculate that Mauremys reevesii may have been farmed for this purpose in antiquity. [17]
M. reevesii is one of the species raised on China's modern-day turtle farms. According to a 1998 survey, 548 farms raised this turtle species in four provinces in China. The statistical data from different provinces were in different formats; however, two provinces reported 20,650 turtles living on 26 farms, with 5,000 animals reproduced annually; the other two provinces reported the total weight of their turtles, namely some 260 tons of these animals on 522 farms. Over the five-year period, 1990–1995, 13 traditional Chinese medicine factories consumed 430 tons of C. reevesii plastrons. [18]
Based on a more recent (2002) survey of 684 Chinese turtle farms (less than half of all 1,499 turtle farms that were registered at the time), researchers found that 2.8 million of turtles of this species (reported there as Chinemys reevesii) lived on these farms, with some 566,000 specimens sold by farmers every year. The total weight of the annual product was 320 tons, with the estimated value of over US$6 million, which makes the market value of a Chinese pond turtle equal to around $12—about twice as much that of the most common farmed species, Pelodiscus sinensis . Taking into account the registered farms that did not respond to the survey, as well as the unregistered producers, the total amounts must be considerably higher. [19]
Chinese pond turtles are farmed for the pet trade. In captivity, they require similar care to red-eared sliders (T. s. elegans).
The Geoemydidae are one of the largest and most diverse families in the order Testudines (turtles), with about 70 species. The family includes the Eurasian pond and river turtles and Neotropical wood turtles.
The Amboina box turtle or Southeast Asian box turtle is a species of Asian box turtle widely distributed across Southeast Asia. It is native to the Asian mainland from northeast India, through Bangladesh, Burma and Thailand, across Laos, Cambodia, Vietnam, and Malaysia. It is also found on the archipelagos of Indonesia and the Philippines.
Oldham's leaf turtle is a species of turtle in the family Geoemydidae.
The golden coin turtle, also known commonly as the Chinese three-banded box turtle and the Chinese three-striped box turtle, is a species of turtle in the family Geoemydidae. The species is native to southern China. There are two recognized subspecies.
Asian box turtles are turtles of the genus Cuora in the family Geoemydidae. About 12 extant species are recognized. The keeled box turtle is often included in this genus, or separated in the monotypic genus Pyxidea. Genus Cuora is distributed from China to Indonesia and the Philippines, throughout mainland Southeast Asia, and into northern India and Bhutan.
The Chinese softshell turtle is a species of softshell turtle that is native to mainland China and Taiwan, with records of escapees—some of which have established introduced populations—in a wide range of other Asian countries, as well as Spain, Brazil and Hawaii.
The Chinese box turtle, also known as the yellow-margined box turtle, or golden-headed turtle, is a species of Asian box turtle. Taxonomically, it is called Cuora flavomarginata.
The Vietnamese pond turtle or Annam leaf turtle is a species of turtle in the family Geoemydidae.
The Chinese broad-headed pond turtle is a species of turtle in the family Geoemydidae. It is endemic to China.
The red-necked pond turtle is a species of turtles in the family Geoemydidae endemic to China. It is most likely restricted to Guangxi and Guangdong provinces, although pre-historic skull remains have been found in northern Vietnam and Hainan. Other common names include Kwangtung river turtle and black-necked pond turtle.
The Fujian pond turtle is a possibly also naturally occurring intergeneric hybrid turtle in the family Geoemydidae. The Fujian pond turtle is produced in larger numbers by Chinese turtle farms as a "copy" of the golden coin turtle Cuora trifasciata. It appears to occur in China and Vietnam. Before its actual origin became known, it was listed as data deficient in the IUCN Red List.
Mauremys is a genus of turtles in the family Geoemydidae.
The Japanese pond turtle, also called commonly the Japanese pond terrapin and the Japanese pond tortoise, is a species of turtle in the family Geoemydidae endemic to Japan. Its Japanese name is nihon ishigame, Japanese stone turtle. Its population has decreased somewhat due to habitat loss, but it is not yet considered a threatened species.
The yellow pond turtle, is a medium-sized, semiaquatic turtle in the family Geoemydidae. This species has a characteristic broad yellow stripe extending behind the eye and down the neck; the carapace ranges in color from grayish brown to brown, and the plastron is yellow or orange with black blotches along the outer edges. It is native to East Asia, ranging from central Vietnam and Laos, north through the coastal provinces of south and central China, with insular populations known from Taiwan, Hainan and the Ryukyu Islands. Although populations in the southern Ryukyus are thought to be native, populations in the northern and central Ryukyus, as well as central Japan, are believed to have been introduced as a result of imports from Taiwan.
Mauremys pritchardi is an interspecific hybrid turtle in the family Geoemydidae. M. pritchardi, described to be from Myanmar, has been found in the wild in China and Japan, and is produced to some extent in Chinese turtle farms. It was listed as data deficient in the IUCN Red List before its actual origin became known.
The Chinese stripe-necked turtle or golden thread turtle, is a species of turtle in the family Geoemydidae. They are widely distributed in the subtropical regions of Taiwan.
Pelodiscus is a genus of turtles in the family Trionychidae, the softshells. Based on genetic and morphological analysis there are seven valid species. They are native to Eastern Asia, ranging from the Amur region, south through China and Korea, as far south as Vietnam. Populations in Japan are thought to likely originate from historic human introductions.
Turtle farming is the practice of raising turtles and tortoises of various species commercially. Raised animals are sold for use as gourmet food, traditional medicine ingredients, or as pets. Some farms also sell young animals to other farms, either as breeding stock, or more commonly to be raised there to a larger size for subsequent resale.
The Iberian pond turtle, also known as the Mediterranean pond turtle or Mediterranean turtle, is a species of turtle in the family Geoemydidae. The species is endemic to southwestern Europe and northwestern Africa.
The Balkan terrapin or western Caspian terrapin is a species of terrapin in the family Geoemydidae. It is found in the eastern Mediterranean region. While technically omnivorous, the terrapins are known to prefer meat. They can grow to 25 cm (9.8 in) in carapace length, although hatchlings are usually only 3 to 4 cm in length.
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