Marine mammals confused men at sea (8)

I believe the answer is:

manatees

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'marine mammals' is the definition.
'manatees' can be an answer for 'mammals' (manatee is a kind of mammal). I am not sure about the 'marine' bit.

'confused men at sea' is the wordplay.
'confused' is an anagram indicator.
'men'+'at'+'sea'='menatsea'
'menatsea' is an anagram of 'MANATEES'.

Can you help me to learn more?

(Other definitions for manatees that I've seen before include "Men at sea (anag) - aquatic mammals" , "Large plant-eating mammals of tropical waters" , "Sirenians" , "Water creatures" .)

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