What is the colony morphology for shigella?

Shigella typically forms small, colorless or pale colonies on non-selective media like nutrient agar, as it is non-lactose fermenting and does not produce acid. On selective media such as MacConkey agar, Shigella appears as colorless colonies, while on XLD (Xylose Lysine Deoxycholate) agar, it may produce red colonies due to the inability to ferment xylose. The colonies are generally smooth, shiny, and convex in shape.