| 词条 | Greater siren |
| 释义 |
|name = Greater siren |fossil_range = {{Geological range|Blancan|present}} [1] |image = Sirenlacertina.jpg |status = LC |status_system = IUCN3.1 |status_ref = [2] |genus = Siren |species = lacertina |authority = Linnaeus, 1766 }} The greater siren (Siren lacertina) is an eel-like amphibian and one of the three members of the genus Siren. The largest of the sirens and one of the largest amphibians in North America, the greater siren resides in the coastal plains of the southeastern United States. DescriptionS. lacertina is paedomorphic, as are all sirens. They lack hindlimbs as well as a pelvic girdle, and have external gills all throughout their lives along with small lungs. They lack eyelids, and have an unfused pectoral girdle.[3] Greater sirens measure around {{convert|1.5|cm|in|abbr=on}} in length upon hatching and then grow to lengths ranging from {{convert|18|to|97|cm|in|round=0.5|abbr=on}}.[5][6] Weight can range from {{convert|55|to|1,000|g|oz|abbr=on}}.[7][8] Coloration varies throughout their range,but they are generally an olive or gray color with small yellow or green dots on their sides. They have about 36 to 40 costal grooves between their armpits and their cloaca.[9] Younger sirens also have a light stripe along their sides, which fades with age. The front legs, each with four toes, are so small that they can be hidden in the gills. {{Citation needed|date=March 2018}} In terms of sensory organs, greater sirens rely on both a modified Jacobson's organ and a lateral line system over their small eyes. It is possible that they are capable of sensing disturbances in electrical fields.[10] BehaviorTheir spermatozoa possess a pair of flagella, and their courtship behavior is unknown.[3] Mating occurs in February and March, with mothers guarding clutches of eggs that hatch about two months later. Youth live in shallower water than adults, often among the roots of water hyacinths.[10] DistributionThey inhabit the coastal plain from Washington, D.C., to Florida and Alabama.[18] A population of sirens in the Rio Grande has been tentatively determined to be S. lacertina. Greater sirens live in wetlands, preferring those with a slow or nonexistent current and a thick layer of organic material. They are capable of inhabiting seasonal and permanent wetlands given their ability to aestivate,[9] and will burrow into mud if their wetland dries up.[18] ConservationGreater sirens are classified as Least concern by the International Union for Conservation of Nature, although they have been extirpated from some of their former range due to habitat loss. They are protected under Mexican law and are assigned to the "Special Protection" category.[18] References1. ^Fossilworks [3][4][5][6][7][8][9][10][11]2. ^Parra-Olea, Gabriela; Wake, David and Hammerson, Geoffrey (2004). Siren lacertina. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. 3. ^1 Greater Siren – North Carolina. Herpsofnc.org (2007-09-22). Retrieved on 2013-01-03. 4. ^1 Siren intermedia. AmphibiaWeb (2003-12-04). Retrieved on 2013-01-03. 5. ^1 {{cite journal|title=Ventilatory Activity in Amphiuma tridactylum and Siren lacertina (Amphibia, Caudata)|author1=Martin, Karen M. |author2=Hutchison, Victor H. |journal=Journal of Herpetology|volume=13|issue= 4 |year=1979|pages=427–434|jstor=156347|doi=10.2307/1563477}} 6. ^1 Deyle, Anna C. (2011) Population Genetics of Amphiuma means and Siren lacertina in Central Florida. M.S. Thesis, University of South Florida 7. ^1 2 3 4 [https://srelherp.uga.edu/salamanders/sirlac.htm]. "Greater Siren (Siren lacertina) Savannah Rive Ecology Laboratory. University of Georgia. 8. ^1 2 3 {{cite web|last1=IUCN|title=Siren lacertina|url=http://www.iucnredlist.org/details/59492/0|website=The IUCN Red List of Threatened Species|publisher=International Union for the Conservation of Nature|accessdate=25 March 2018}} 9. ^1 {{cite journal|last1=Hill|first1=Robert L.|last2=Mendelson III|first2=Joseph R.|last3=Stabile|first3=Jennifer L.|title=Direct Observation and Review of Herbivory in Sirenidae (Amphibia: Caudata)|journal=Notes of the Southeastern Naturalist|date=2015|volume=14|issue=1|pages=N5-N9}} 10. ^1 2 {{cite book|last1=Vitt|first1=Laurie J.|last2=Caldwell|first2=Janalee P.|title=Herpetology|date=2014|publisher=Elsevier|location=32 Jamestown Road, London NW1 7BY, UK|isbn=978-0-12-386919-7|edition=Fourth}} 11. ^1 2 3 4 {{cite web|last1=McKenzie|first1=Kimberley|title=Siren lacertina|url=https://animaldiversity.org/accounts/Siren_lacertina/|website=Animal Diversity Web|publisher=University of Michigan Museum of Zoology|accessdate=25 March 2018}} }} External links{{Commons category-inline|Siren lacertina}}
3 : Sirenoidea|Amphibians of the United States|Animals described in 1766 |
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