单词	sirenian
释义	sirenian /sʌɪˈriːnɪən / Zoology noun A large aquatic plant-eating mammal of the order Sirenia, such as a manatee or dugong.The remaining sirenians, are seriously threatened by hunting, habitat degradation, and in the case of manatees, collisions with boats in the shallow coastal areas they prefer.... Modern sirenians are large, docile, aquatic herbivores. To understand isotopic variation in Florida sirenians, we selected four teeth for serial sampling. adjective Relating to or denoting sirenians.This may have supported a strong, fleshy lip with which Thalassocnus grazed seagrass or kelp, much like manatees and their sirenian relatives.... The hyrax - elephant - sirenian core is well-accepted on morphological grounds. Corystosiren is a late-surviving dugong at a time when sirenian fossils are exceedingly rare in Florida.
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