The bell of Acromitus rabanchatu typically has a bluish hue. The exumbrella is finely granulated. Inside the ring canal, there are a limited number (not exceeding three) of faintly branched anastomoses. The oral arms can extend up to twice the length of the bell radius, featuring long, thread-like endings and short whip-like filaments. The sub-genital papillae are broad, triangular cones with blunt tips.