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A fossil found in 2008 may be the miss link — for manatees , that is .
Modern manateesand their lookalike relation , the dugongs , are snug relatives of elephant , yet no trace of their ancestry had ever been found in Africa , where elephants develop .
A manatee floats peacefully.
Then a small bit of skull was found unexpectedly in Tunisia . The dodo , which scientist have been able-bodied to identify as from an out ocean cow , re - root the origin of manatee in Africa , said subject area researcher Julian Benoit of the University of Science and Technology in Montpellier , France .
" No fossil Sirenian was found in this locality before , " Benoit told LiveScience . " It was unexampled and really exciting . " [ Sirenian Gallery : Photos of Cute Sea Cows ]
Manatee mystery story
A fragment of skull bone from a sea cow found in Tunisia (right) compared with a fossil of the same bone from an ancient species found in Jamaica.
bellying and blue-blooded , the manatee is also a scrap of a mystery . This devil dog herbivore , often called a ocean cow , is part of a group known as Sirenians , which includes onlyfour support species .
Sea moo-cow are the closest relatives of elephants and hyraxes , small rodentlike mammalian that also rise in Africa , and yet the oldest sea moo-cow fogey come from Jamaica .
" It was a biogeographical paradox , " Benoit said .
In 2008 , however , researcher uncovered a shard of sea cow bone from sediments in Djebel Chambi National Park in Tunisia . The site would have supported a fresh water lake when this sea moo-cow lived some 48 million days ago .
The fossil happen to be the petrosal os , which get along from theear regionof mammals . This was a stroke of hazard , because the ivory sits properly next to the brain , intimate pinna , carotid arteria , cranial nerves and other major structure , Benoit said . The osseous tissue model to these structures , shape a unequalled shape for each species .
" When it is preserve as a fossil , the marks left by these soft tissue paper on the petrosal bone can be remodel with extremely refined precision , " he said .
Tracing the ocean moo-cow
These reconstructions allow the scientist to compare the fresh fossil with living and extinct ocean cows . The tightness of the osseous tissue also divulge that the sea cow from Chambi was an aquatic species . Combined with the fact that the ancient Lake Chambi was freshwater , the dodo suggests that rude sea cow ancestors were not seawater inhabitant .
To get to Jamaica , however , the sea cow had to adapt , Benoit said .
" The dispersal of sea oxen to Jamaica , maybe through the Atlantic Ocean , proves that adaptation to ocean waters was a primal event of their subsequent prosperity , " he said .
The researcher report their termination online today ( Jan. 16 ) in the journalPLOS ONE .
