アマゾンマナティー
WordNet
- type and sole genus of the Trichechidae (同)genus Trichecus
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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/03/26 14:19:00」(JST)
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| Amazonian Manatee[1] |
|
| Baby Amazonian Manatee |
| Conservation status |
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Vulnerable (IUCN 3.1)[2]
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| Scientific classification |
| Kingdom: |
Animalia |
| Phylum: |
Chordata |
| Subphylum: |
Vertebrata |
| Class: |
Mammalia |
| Order: |
Sirenia |
| Family: |
Trichechidae |
| Genus: |
Trichechus |
| Species: |
T. inunguis |
| Binomial name |
Trichechus inunguis
(Natterer, 1883) |
|
| Amazonian Manatee range |
The Amazonian Manatee (Trichechus inunguis) is a species of manatee that lives in the freshwater habitats of the Amazon basin. They are found in Brazil, Peru, Colombia, Ecuador, Guyana, and Venezuela. Amazonian manatees are aquatic animals of the Sirenia order and are also known as "seacows". Their colour is grey but sometimes appears to be a brownish grey. They have thick, wrinkled skin, are almost hairless but have "whiskers" around their mouths.[3] It lacks significant predation, other than being occasionally hunted by humans. The manatees, and the closely related Dugong, are unusual in being the only extant plant-eating marine mammals.
An almost unique feature (amongst mammals) of the manatee is the constant replacement of molar teeth; new teeth enter at the back of the jaw and replace old and worn teeth at the front. Their closest cousins, the elephants, also have teeth that get replaced, but have only a limited set of these replacement teeth.
Amazonian manatees are the smallest species of manatee besides the dwarf manatee. They may reach a length of 2.8 m (9.2 ft). Females are typically larger than males and can weigh 360 to 540 kg (800 to 1200 lbs). They also lack the nails found on the end of most flippers.
Recently, a closely related but far smaller species, the Dwarf Manatee (Trichechus "pygmaeus"), has been described from Brazil by Dr. Marc van Roosmalen. Called the peixe-boi anão in Brazilian Portuguese, it is about 130 cm (4.2 ft) long and lives in fast-flowing streams.[4] Its validity has later been questioned, with some believing it to be an immature Amazonian Manatee.[5]
See also
- Unihemispheric slow-wave sleep
- Evolution of sirenians
References
- ^ Shoshani, Jeheskel (16 November 2005). Wilson, Don E., and Reeder, DeeAnn M., eds. ed. Mammal Species of the World (3rd ed.). Baltimore: Johns Hopkins University Press, 2 vols. (2142 pp.). pp. 93. ISBN 978-0-8018-8221-0. OCLC 62265494. http://www.bucknell.edu/msw3.
- ^ Marmontel, M. (2008). Trichechus inunguis. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 29 December 2008.
- ^ conserve nature manatee site
- ^ van Roosmalen, M. G. M. A new species of living manatee from the Amazon.. Accessed on March 16, 2008.
- ^ Trials of a Primatologist. - smithsonianmag.com. Accessed March 16, 2008.
- Multiple new species of large, living mammals (part III) - Tetrapod zoology. Accessed March 16, 2008.
External links
- ARKive - images and movies of the Amazonian manatee (Trichechus inunguis)
- Amazonian Manatee article at sirenian.org
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Extant Sirenia species by family
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Kingdom Animalia · Phylum Chordata · Class Mammalia · Infraclass Eutheria · Superorder Afrotheria
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Dugongidae
(Dugongs) |
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Dugonginae
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Dugong (D. dugon)
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Trichechidae
(Manatees) |
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Trichechus
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Amazonian Manatee (T. inunguis) · West Indian Manatee (T. manatus) · African Manatee (T. senegalensis)
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Category
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English Journal
- First attempt to monitor luteinizing hormone and reproductive steroids in urine samples of the Amazonian manatee (Trichechus inunguis).
- Amaral RS, Rosas FC, Graham LH, da Silva VM, Oliveira CA.
- Journal of zoo and wildlife medicine : official publication of the American Association of Zoo Veterinarians.J Zoo Wildl Med.2014 Dec;45(4):843-51.
- The aims of this study were to validate an enzyme immunoassay (EIA) for the measurement of luteinizing hormone (LH) in urine samples of Amazonian manatees (Trichechus inunguis; Mammalia: Sirenia) and to monitor urinary LH and reproductive steroids during the ovarian cycle in this species. Urine samp
- PMID 25632672
- Acoustical and anatomical determination of sound production and transmission in West Indian (Trichechus manatus) and Amazonian (T. inunguis) manatees.
- Landrau-Giovannetti N1, Mignucci-Giannoni AA, Reidenberg JS.
- Anatomical record (Hoboken, N.J. : 2007).Anat Rec (Hoboken).2014 Oct;297(10):1896-907. doi: 10.1002/ar.22993. Epub 2014 Jul 16.
- West Indian (Trichechus manatus) and Amazonian (T. inunguis) manatees are vocal mammals, with most sounds produced for communication between mothers and calves. While their hearing and vocalizations have been well studied, the actual mechanism of sound production is unknown. Acoustical recordings an
- PMID 25044536
- The mammary glands of the Amazonian manatee, Trichechus inunguis (Mammalia: Sirenia): morphological characteristics and microscopic anatomy.
- Rodrigues FR1, da Silva VM, Barcellos JF.
- Anatomical record (Hoboken, N.J. : 2007).Anat Rec (Hoboken).2014 Aug;297(8):1532-5. doi: 10.1002/ar.22956. Epub 2014 Jun 12.
- The mammaries from carcasses of two female Amazonian manatees were examined. Trichechus inunguis possesses two axillary mammaries beneath the pectoral fins, one on each side of the body. Each papilla mammae has a small hole on its apex--the ostium papillare. The mammaries are covered by a stratified
- PMID 24920139
Japanese Journal
- Application of acceleration data loggers to classify the behavior of captive Amazonian manatees (Trichechus inunguis)
- Kikuchi Mumi,Silva Vera M. F. da,Rosas Fernando C. W. [他]
- Coastal marine science 34(1), 24-30, 2010
- … The Trichechus inunguis is endemic to the Amazon region. …
- NAID 40017386864
Related Links
- The Amazonian manatee (Trichechus inunguis) is a species of manatee of the order Sirenia, which is shares with the marine dugong. It is found living in the freshwater habitats of the Amazon Basin in Brazil, Peru, Colombia, Ecuador, Guyana, ...
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