MK MP Kanimozhi, who was elected from the Thoothukudi Lok Sabha constituency, has been appointed as the party's parliamentary leader, the DMK said.
She replaces the Sriperumbudur MP T R Baalu, who will now head the DMK in the Lok Sabha.
Dayanidhi Maran, representing the Chennai Central constituency, will be the party's deputy leader in the Lok Sabha, DMK president and Tamil Nadu Chief Minister M K Stalin said in a statement here on Monday.