Which of following is not considered as basic shape of a bacterium?

Explanation

Option B is correct.On the basis of general shape, bacteria are classified into three categories. These shapes are known as cocci, bacilli and spiral .Although most of the bacterial species have fairly constant characteristic cell shape, yet some cells are pleomorphic and they can exist in a variety of shapes Exceptions to the above shapes are trichome forming, sheathed, stalked,square, starshaped, spindle-shaped, lobed and filamentous bacteria