( ( In ( the ( early ( 19th century ) ) ) ) ( , ( ( the ( French ( naturalist Latreille ) ) ) ( ( ( was ( ( the first ) ( to ( divide tetrapods ) ) ) ) ( into ( ( the ( four ( familiar classes ) ) ) ( of ( amphibians ( , ( reptiles ( , ( ( birds and ) mammals ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT the) (JJ early) (JJ 19th) (NN century))) (, ,) (NP (DT the) (JJ French) (NN naturalist) (NN Latreille)) (VP (VBD was) (NP (NP (DT the) (JJ first)) (PP (TO to) (NP (NN divide) (NNS tetrapods)))) (PP (IN into) (NP (NP (DT the) (CD four) (JJ familiar) (NNS classes)) (PP (IN of) (NP (NNS amphibians) (, ,) (NNS reptiles) (, ,) (NNS birds) (CC and) (NNS mammals)))))) (. .)))
In the early 19th century, the French naturalist Latreille was the first to divide tetrapods into the four familiar classes of amphibians, reptiles, birds and mammals.
(ROOT (S (NP (NP (NNS Amphibians)) (PRN (-LRB- -LRB-) (CC or) (ADJP (JJ tetrapods)) (-RRB- -RRB-))) (VP (VBD were) (NP (NP (DT the) (JJ first)) (PP (IN with) (NP (CD four) (NNS limbs))))) (. .)))