* Shares unmoved by latest developments
(Adds details on board members, background):
(Reuters) - Tesla Inc’s board (TSLA.O) named a special committee of three directors on Tuesday to negotiate with Elon Musk on taking the electric carmaker private, although it said it was yet to see a firm offer from the company’s chief executive. Musk said on Monday he had held talks with a Saudi sovereign fund on a buyout that would take Tesla off the Nasdaq exchange - an extraordinary move for what is now the United States’ most valuable automaker, worth more than $60 billion.