( ( ( ( ( They ( are ( ( distributed primarily ) ( in ( ( the tropics ) ( of ( both hemispheres ) ) ) ) ) ) ) , ) but ) ( ( some species ) ( range ( into ( the ( temperate zones ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP They)) (VP (VBP are) (VP (VBN distributed) (ADVP (RB primarily)) (PP (IN in) (NP (NP (DT the) (NNS tropics)) (PP (IN of) (NP (DT both) (NNS hemispheres)))))))) (, ,) (CC but) (S (NP (DT some) (NNS species)) (VP (VBP range) (PP (IN into) (NP (DT the) (JJ temperate) (NNS zones))))) (. .)))
They are distributed primarily in the tropics of both hemispheres, but some species range into the temperate zones.
(ROOT (S (NP (NP (DT Some)) (PP (IN of) (NP (NP (DT the) (JJS greatest) (NNS concentrations)) (PP (IN of) (NP (NNS species)))))) (VP (VBP are) (VP (VBN found) (PP (IN in) (NP (DT the) (NNS tropics))))) (. .)))