Disk strongly indented interradially; length of radial shields about 1/4 disk diameter, contiguous for most of length; 3-4 arm spines. Jaws lined with long plate-like structure with a sharp outer edge giving the jaw an arrow-head appearance. Teeth long, sharply pointed structures with two or three on each jaw; dorsal arm plate with a distinctive proximal notch.
STÖHR S. & M. SEGONZAC (2005) J. Mar. Biol. Ass. UK 85: 383-402.