Disappearing senators of 45th parliament

DISAPPEARING SENATORS OF THE 45TH PARLIAMENT

* Scott Ludlam (Greens) Resigned after discovering he was still a dual citizen, ruling him ineligible to stand for election. The party's co-deputy leader, who was born in New Zealand but naturalised as a teenager in Australia, has been in the Senate since 2007.

* Rod Culleton (One Nation turned independent) Booted from the Senate after the High Court ruled he wasn't validly elected because he had been convicted of a larceny charge at the time of voting - even though it was later quashed. The Federal Court also declared him a bankrupt, which would also have disqualified him from sitting in parliament.

* Bob Day (Family First)

Resigned before the High Court determined he had been improperly elected. It found the South Australian indirectly benefited from a government lease arrangement on his Adelaide electorate office, in breach of the constitution.