 The articulating middle part of the body (or thorax) has 7 segments, the outer tips bending backwards, pointed and darker.The tailshield (or pygidium) is semicircular, straight or almost indented and has a long, low, tapering axis with 5 or 6 rings, and 4 or 5 pleural furrows.The border in the pygidium is as wide as in the cephalon and is also often darker, but the border furrow is very shallow or absent.