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Xystridura

XYSTRIDURA This trilobite is broadly oval in outline. Its head section is about twice as wide as it is long, with a well-furrowed glabella and large eyes. The genal angle has extended to form short genal spines. The thorax is divided into 13 segments, with the axis much narrower than the deeply furrowed pleural lobes. The tail shield is also furrowed, and spines are present around the posterior margin. Habitat: Xystridura lived on or near the sediment of the sea bed. © 1992 Cyril Walker, David Ward .

6 cm