( ( Amniote ( Lagerst&auml;tten ( E ( xquisite preservation ) ) ) ) ( ( became ( ( the rule ) ( for ( ( many ( new ( amniote discoveries ) ) ) ( -LRB- ( ( ( birds , ) ( ( ( ( reptiles , ) mammals ) or ) ( ( any ( other group ) ) ( of ( vertebrates ( that ( ( undergoes ( embryonic development ) ) ( within ( ( a ( thin membrane ) ) ( forming ( ( ( ( a ( closed sac ) ) , ) or ) amnion ) ) ) ) ) ) ) ) ) ) ) -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Amniote) (NNP Lagerst&auml;tten) (NNP E) (NN xquisite) (NN preservation)) (VP (VBD became) (NP (NP (DT the) (NN rule)) (PP (IN for) (NP (NP (JJ many) (JJ new) (NN amniote) (NNS discoveries)) (PRN (-LRB- -LRB-) (NP (NP (NNS birds)) (, ,) (NP (NP (NNS reptiles)) (, ,) (NP (NNS mammals)) (CC or) (NP (NP (DT any) (JJ other) (NN group)) (PP (IN of) (NP (NP (NNS vertebrates)) (SBAR (WHNP (WDT that)) (S (VP (VBZ undergoes) (NP (JJ embryonic) (NN development)) (PP (IN within) (NP (NP (DT a) (JJ thin) (NN membrane)) (VP (VBG forming) (NP (NP (DT a) (JJ closed) (NN sac)) (, ,) (CC or) (NP (NN amnion)))))))))))))) (-RRB- -RRB-)))))) (. .)))
Amniote Lagerst&auml;tten E xquisite preservation became the rule for many new amniote discoveries (birds, reptiles, mammals or any other group of vertebrates that undergoes embryonic development within a thin membrane forming a closed sac, or amnion).
(ROOT (S (SBAR (IN Because) (S (NP (PRP$ their) (NNS embryos)) (VP (VBP are) (VP (VBN surrounded) (PP (IN by) (NP (DT a) (JJ thin) (NN membrane))))))) (, ,) (NP (NNS reptiles)) (VP (VBP are) (VP (VBN considered) (NP (NNS amniotes)))) (. .)))