Fig. 5 in The Early Cambrian (Botomian) stem group brachiopod Mickwitzia from Northeast Greenland

Fig. 5. Mickwitzia cf. occidens Walcott, fragment of mature shell MGUH 26298. A. Acrotretoid−type column with clusters of adhering cocci; scale bar 10 µm. B. Acrotretoid−type column entirely filled by centripetal lamination. Note the two single adhering cocci; scale bar 10 µm. C. Detail of single dome−shaped coccus attached to column; scale bar 2 µm. D. Acrotretoid−type column (left) entirely covered by attached and overlapping discoidal bodies (= deformed cocci) and some individual spheroidal cocci; scale bar 10 µm. E. Detail of surface of left column with overlapping discoidal structures; scale bar 2 µm. F. Aborted, dome−shaped acrotretoid−type column, with indications of annulations; scale bar 10 µm. G. Detail of top of aborted column in F, showing a finely platy cover; scale bar 2 µm. H. Cluster of cocci, with indication of asexual binary fission; scale bar 2 µm. I. Detail of central cocci in H, showing platy cover; scale bar 1 µm. J. Detail of cocci−covered lamina and columns; scale bar 5 µm. K. Detail of single spheroidal cocci attached to column; scale bar 2 µm. L. Detail of K, showing possible aperture. Note the platy appearance of the outer surface; scale bar 1 µm. The specimen is from the Ella Island Formation (sample GGU 314816).