Speaker P Dhanapal, who accepted the resignations, declared that Vijayakant has lost his Opposition Leader status since the strength of his party in the Assembly has now come down to 20 from 28.
DMDK founder Vijayakant no longer meets the "qualification" to be recognised as the Opposition Leader under relevant Assembly rules, the Speaker's Secretariat said in a release.
Further, with no other party having the 24 members stipulated for the same, "nobody else can be recognised as Opposition Leader", the release said quoting the Speaker.
The DMDK MLAs who tendered their resignation are -- C Arun Pandian, M Arun Subramanian, K Pandiarajan, K Tamil Azhagan, S Michael Rayappan, R Sundarrajan, T Suresh Kumar and R Santhi.
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Actor-politician Vijayakant, who made his Assembly debut in 2006 as the then lone DMDK MLA, became Opposition Leader after the 2011 elections, when his party bagged 29 seats.
The party's senior leader and former Alandur MLA Panrutty S Ramachandran had resigned in 2014 before joining AIADMK, bringing down DMDK's strength to 28.
Though he had joined hands with the ruling AIADMK for the 2011 elections, Vijayakant had later walked out of the alliance after a spat with Chief Minister J Jayalalithaa on the floor of the Assembly.
The Speaker also accepted the resignation of Puthiya
Tamizhagam MLA from Nilakottai (SC) constituency, A Ramasamy.
He was elected to the 14th Assembly along with party founder Dr S Krishnasamy (Oddapidaram), but had later switched allegiance to the ruling party.
Similarly, PMK dissident MLA Kalai Arasu's resignation was also accepted by Dhanapal, the release said.
PMK had won three seats in the 2011 Assembly elections with Kalai Arasu bagging the Anaikattu seat.