Exceptionally well-preserved Orsten-type phosphatocopid crustaceans from the Cambrian of Poland Author Olempska, Ewa Author Maas, Andreas Author Waloszek, Dieter Author Eriksson, Mats E. text Acta Palaeontologica Polonica 2019 2019-02-07 64 1 19 39 http://dx.doi.org/10.4202/app.00553.2018 journal article 10.4202/app.00553.2018 1732-2421 10626598 Genus Cyclotron Rushton, 1969 Type species : Polyphyma lapworthi Groom, 1902 ; Malvern Hills, England ; Cambrian, Furonian, Olenus Biozone ( Groom 1902 ). Remarks .—Phosphatocopid taxonomy was for a long time based on external shield features, such as the occurrence and location of lobes and spines, and the general outline of the shield (e.g., Maas et al. 2003 ). Although minute details also of the ventral appendage morphology have been described ( Müller 1979 , 1982 ; Maas et al. 2003 ; Maas and Waloszek 2005 ; Zhang et al. 2010), such features remain unknown for most species.