A new genus and species of aglaspidid arthropod, Tremaglaspis unite, is described from the well‐known upper Tremadoc locality of Y Garth in North Wales, and compared with other Cambrian and Ordovician taxa. It is remarkable in having a large hypostome, a character shared with other primitive arachnomorphs.
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Fortey et al. (2003) studied this question.
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