 In addition to <unk> , 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 <unk> outside <unk> , and <unk> is now considered a <unk> reptile . 
