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DescriptionPetrobius maritimus are fast-running insects with elongate, tapered, grey mottled coloured bodies up to 1.5 cm long. They have three pairs of legs and a triple forked tail. Individuals have prominent eyes and a short pair of palps on the head set between a further pair of long, bristly antennae of 30 or more segments.Petrobius maritimus, may be confused with Petrobius brevistylis which occurs in the same habitat. The two species can be separated by the sub-coxae of the male. In Petrobius brevistylis the 8th abdominal segment is prolonged into rounded lobes, whereas lobes are absent in Petrobius maritimus.