SUMMARY The recently rediscovered holotype of the fossil arachnid Maiocercus orbicularis Gill, 1911 (Arachnida: Trigonotarbida), from the Upper Carboniferous (Pennsylvanian, Westphalian A) of Westhoughton near Bolton, is described and figured from its repository in the Bolton Museum. Its status as a junior synonym of Maiocercus celticus (Pocock, 1902) is confirmed.
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Craven et al. (2008) studied this question.
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