prosomapoda

/P R AA1 S OW0 M AH0 P OW1 D AH0/
N
  1. 1

    a clade of euchelicerates including the groups Xiphosura (horseshoe crabs) and Planaterga (a group comprising bunodids, pseudoniscids, chasmataspidids, eurypterids and arachnids), as well as several basal synziphosurid genera.

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