New euthycarcinoids and an enigmatic arthropod from the British coal measures

Two new species of euthycarcinoids (Arthropoda), Kottixerxes anglicus sp. n ov. and Smithixerxes pustulosus sp. nov., are described from the Coal Measu res of Westhoughton, Lancashire and Coseley, West Midlands (Westphalian A a nd B respectively). Both genera are previously known from Mazon Creek, USA (Westphalian D). An additional, enigmatic arthropod with possible euthycarc inoid affinities, Arthrogyrinus platyurus gen. et sp. nov., is described fr om Coseley. Hypotheses concerning the phylogenetic position of euthycarcino ids are critically reviewed.