It is not strictly true to say “it later transpired" that ZSL had Z.bartoni
The ZSL knew that these echidnas were the ‘bartoni’ form; however, ‘bartoni’ was then believed to be sub-species of ‘bruijinii’; they were always considered to be Zaglossus bruijnii bartoni
London Zoo sent its trio of long-beaked echidnas to Taronga in 1994; one had been in the zoo since in 1965 and one was the ex-Dallas specimen received in 1986 (having already spent fifteen years in Dallas).