(from email correspondence with the zoo)
*Black-capped Capuchins/Tufted Capuchins first arrived at the zoo in August 2001 and became residents of the zoo's 'Lesser Primates' precinct complex at that time (if zoo ever held species before was likely a very long time ago, as (what is already established knowledge on this forum thanks to others) the zoo had held a long term group of White-fronted Capuchins from the 1930s until *2010 (*off display for last few years at the zoo). Thought not 'out of the question' for the zoo to have held two different Capuchin species at some point seeing as they did just that from August 2001-2010; the Black-capped Capuchins that arrived in Aug' 2001 were very possibly the first of their species to live at Perth Zoo.
*Apparently some Bolivian Squirrel Monkeys arrived at the zoo in July 1982, probably intended for the 'Lesser Primates' complex (however that complex did not open untl 1984/1985). Apparently the zoo had Common Squirrel Monkeys (possibly hybridised with Bolivian Squirrel Monkeys who believe were considered a sbsp of at the time) during the 1970s and 1980s through to the early 1990s (they lived in the walk-through exhibit in Lesser Primates complex; were replaced with Cotton-top Tamarins (and a short-term trial at co-habitating the Cotton-tops' with Red-handed Tamarins but the latter were agressive to the former; almost hunting after them) in the walk-through exhibit (and the zoo's Green Iguana during the warmer months too), then Ringtailed Lemurs sometime later in early 2000s, possibly very late 1990s). But there may have been a gap in the time the zoo had any Squirrel Monkeys, or at least they were kept off display. Apparently they returned in early 2000s (at least to public display, am of the slight opion maybe July '82 was typo for July 2002 but dont want to indicate thinking the zoo had a glitch on record system, albeit could happen to anyone).
*Apparently the last Thick-tailed Bushbaby died in 1998 according to their email account of their records. This species lived in the zoo's Nocturnal House (possibly since the Noc' House opened in 1977).
*While with the zoo's (Big) Hairy Armadillos, the email correspondence record results the zoo shared state that the last individual died in 1987; there definitely was one individual still living at the zoo until at least the mid-1990s, possibly as late as 1997 (a former keeper at the zoo there during the time period agrees with there still being one individual present during much of the 1990s). Personaly think the death record of the last Hairy Armadillo at the zoo was accidentally missplaced or email typo. The Hairy Armadillos had been residents of the zoo's Noc' House right from the complex's 1977 opening (thought perhaps not the same individuals, personally believe they likely were the same, but very possible that the zoo succeeded in breeding them and having had inidviduals born at the zoo during that time).