Currently there is just one recognized species , `` P. harlani '' , ( Owen ) 1840 , which is commonly referred to as Harlan 's ground sloth in honor of American paleontologist Dr. Richard Harlan who first discovered and described a lower jaw in 1835 .
There is just one recognized species , `` P. harlani '' , ( Owen ) 1840 , which is commonly referred to as Harlan 's ground sloth in honor of the American paleontologist who first discovered and described a lower jaw in 1835 .