( ( ( ( It ( was ( ( the discovery ) ( of ( Eris ( in ( particular ( that ( ultimately ( ( led ( to ( ( ( Pluto 's ) classification ) ( -LRB- ( 2006 -RRB- ) ) ) ) ) ( as ( a ( dwarf planet ) ) ) ) ) ) ) ) ) ) ) ) ) ; ) ( ( transneptunian ( dwarf planets ) ) ( ( are now ) ( classified ( as plutoids ) ) ) ) ) . )
(ROOT (S (S (NP (PRP It)) (VP (VBD was) (NP (NP (DT the) (NN discovery)) (PP (IN of) (NP (NP (NNP Eris)) (PP (IN in) (NP (NP (JJ particular)) (SBAR (WHNP (WDT that)) (S (ADVP (RB ultimately)) (VP (VBN led) (PP (TO to) (NP (NP (NP (NNP Pluto) (POS 's)) (NN classification)) (PRN (-LRB- -LRB-) (NP (CD 2006)) (-RRB- -RRB-)))) (PP (IN as) (NP (DT a) (NN dwarf) (NN planet))))))))))))) (: ;) (S (NP (NN transneptunian) (NN dwarf) (NNS planets)) (VP (VBP are) (ADVP (RB now)) (VP (VBN classified) (PP (IN as) (NP (NNS plutoids)))))) (. .)))
It was the discovery of Eris in particular that ultimately led to Pluto's classification (2006) as a dwarf planet; transneptunian dwarf planets are now classified as plutoids.
(ROOT (S (NP (NNP Pluto)) (VP (VBZ is) (ADVP (RB now)) (VP (VBN called) (NP (NN dwarf) (NN planet)))) (. .)))