( Arandaspids ( ( represent ( ( ( the ( ( oldest known ) craniates ) ) , ) ( ( ( a ( proposed group ) ) ( of chordates ) ) ( that ( ( contain ( all chordates ) ) ( with ( ( ( ( ( a ( cartilage-derived skull ) ) ( -LRB- ( ( ( ( ( ( ( ( i.e. , ) lampreys ) , ) ( armored agnathans ) ) , ) and ) gnathostomes ) -RRB- ) ) ) , ) and ) hagfish ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Arandaspids)) (VP (VBP represent) (NP (NP (DT the) (ADJP (JJS oldest) (VBN known)) (NNS craniates)) (, ,) (NP (NP (DT a) (VBN proposed) (NN group)) (PP (IN of) (NP (NNS chordates))) (SBAR (WHNP (WDT that)) (S (VP (VBP contain) (NP (DT all) (NNS chordates)) (PP (IN with) (NP (NP (DT a) (JJ cartilage-derived) (NN skull)) (PRN (-LRB- -LRB-) (NP (NP (NNP i.e.)) (, ,) (NP (NNS lampreys)) (, ,) (NP (JJ armored) (NNS agnathans)) (, ,) (CC and) (NP (NNS gnathostomes))) (-RRB- -RRB-)) (, ,) (CC and) (NP (NN hagfish)))))))))) (. .)))
Arandaspids represent the oldest known craniates, a proposed group of chordates that contain all chordates with a cartilage-derived skull (i.e., lampreys, armored agnathans, and gnathostomes), and hagfish.
(ROOT (S (NP (NNS Hagfishes)) (VP (VBP have) (NP (NP (DT a) (NN skull)) (VP (VBN made) (PP (IN of) (NP (NN cartilage)))))) (. .)))