( This ( ( suggests ( that ( ( island 1 ) ( was ( ( a ( lobe-fin ( developmental enhancer ) ) ) ( in ( ( the ( fish ancestor ) ) ( of ( tetrapods ( that ( ( was then ) ( coopted ( into ( ( the ( autopod enhancer ) ) ( of ( modern tetrapods ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ suggests) (SBAR (IN that) (S (NP (NN island) (CD 1)) (VP (VBD was) (NP (NP (DT a) (JJ lobe-fin) (JJ developmental) (NN enhancer)) (PP (IN in) (NP (NP (DT the) (NN fish) (NN ancestor)) (PP (IN of) (NP (NP (NNS tetrapods)) (SBAR (WHNP (WDT that)) (S (VP (VBD was) (ADVP (RB then)) (VP (VBN coopted) (PP (IN into) (NP (NP (DT the) (JJ autopod) (NN enhancer)) (PP (IN of) (NP (JJ modern) (NNS tetrapods)))))))))))))))))) (. .)))
This suggests that island 1 was a lobe-fin developmental enhancer in the fish ancestor of tetrapods that was then coopted into the autopod enhancer of modern tetrapods.
(ROOT (S (NP (NNS Caecillians)) (VP (VBD evolved) (PP (IN from) (NP (JJ tetrapod) (NNS ancestors)))) (. .)))