Trichechus

**Definition:** A genus of the order Sirenia comprising what are commonly called manatees. The distinguishing characteristics include a tail that is not notched, a short nasal cavity, the absence of nasal bones, and enamel-covered teeth. Members of this genus are found in marine bays and/or sluggish rivers, usually in turbid water. (From Scott, Concise Encyclopedia Biology, 1996)

**Tree numbers:** - B01.050.150.900.649.313.250.750.750

**Synonyms:** - Manatees