Fig. 5 in First palaeoscolecid from the Cambrian (Drumian, Miaolingian) Marjum Formation of western Utah, USA

Fig. 5. Scleritome of the palaeoscolecid Arrakiscolex aasei gen et sp. nov. from the Drumian, Cambrian Marjum Formation in the House Range of Utah, USA (Grey Marjum locality). A. SEM micrographs of paratype (KUMIP 314101). A1, dense and homogeneous distribution of the plates on the surfaces of annuli; A2, interannular region showing alternation between plate-free areas and plate-covered areas ("columns"; arrowheads). B. SEM micrographs of holotype (KUMIP 314100). B1, homogeneous distribution of the plates; B2, single plate, showing the swollen inner region surrounded by a raised marginal rim.