text:  In addition to Mastodonsaurus , some of the earliest named genera included <unk> and <unk> in 1842 , <unk> in 1848 , <unk> in 1849 , <unk> and <unk> in 1853 , <unk> in 1858 , and <unk> in 1859 . <unk> is now placed as an early tetrapod outside Temnospondyli , and <unk> is now considered a <unk> reptile . 
  