| 词条 | Dwarf manatee |
| 释义 |
| name = Dwarf manatee | status = NR | status_ref = [1] | status_system = IUCN3.1 | classification_status = disputed | regnum = Animalia | phylum = Chordata | classis = Mammalia | ordo = Sirenia | familia = Trichechidae | genus = Trichechus | species = T. pygmaeus | binomial = Trichechus pygmaeus | binomial_authority = Marc van Roosmalen, 2015 }} The dwarf manatee (Trichechus pygmaeus, or mistakenly Trichechus bernhardi)[2] is a possible species of manatee found in the freshwater habitats of the Amazon, though restricted to one tributary of the Aripuanã River. According to Marc van Roosmalen, the scientist who proposed it as a new species, it lives in shallow, fast-running water, and feeds on different species of aquatic plants from the Amazonian manatee, which prefers deeper, slower-moving waters and the plants found there. The dwarf manatee reportedly migrates upriver during the rainy season when the river floods to the headwaters and shallow ponds. Based on its small range, the dwarf manatee is suggested to be considered critically endangered, but at present it is not recognized by the IUCN.[1] The dwarf manatee is typically about {{convert|130|cm|ft|abbr=on}} long, and weighs about {{convert|60|kg|lb|abbr=on}}, making it the smallest extant sirenians. It is overall very dark, almost black, with a white patch on the abdomen. It may actually represent an immature Amazonian manatee, but it is reported to differ in proportions and colour. It is, however, at least very closely related, as mtDNA has failed to reveal any difference between the two. Mutation rates in manatees – if the dwarf manatee is distinct – suggests a divergence time of less than 485,000 years. Daryl Domning, a Smithsonian Institution research associate and one of the world's foremost experts on manatee evolution,[3] has stated that the DNA evidence actually proves that these merely are immature Amazonian manatees.[4] TaxonomyThe original description was submitted for publication to Nature, but it was rejected,[2] and it was eventually published in the Biodiversity Journal in 2015.[5] References1. ^1 International Union for Conservation of Nature (2008). IUCN Red List. Accessed November 09, 2009. 2. ^1 William. (2008). Interview with Marc van Roosmalen. aquaticcommunity.com. Accessed November 09, 2009. 3. ^How Manatees Evolved. manateebrain.org. Accessed 2008-07-27 4. ^[https://www.smithsonianmag.com/science-nature/trials-of-a-primatologist-17248331/#qIek4ZhbcrC2YOGF.99 Trials of a Primatologist.] smithsonianmag.com. Accessed 2008-07-27 5. ^{{cite journal |author=Marc G.M. van Roosmalen |year=2015 |title=Hotspot of new megafauna found in the Central Amazon: the lower Rio Aripuanã Basin |journal=Biodiversity Journal |volume=6 |issue=1 |pages=219–244 |url=http://www.biodiversityjournal.com/pdf/6%281%29_219-244.pdf }} External links
3 : Sirenians|Controversial mammal taxa|Mammals described in 2015 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。