Fig. 1 in A revaluation of rhipidocystid echinoderms based on a new flattened blastozoan from the Upper Ordovician of Maryland, USA

Fig. 1. Rhipidocystid echinoderm Durhamicystis americana gen. et sp. nov. from the Upper Ordovician Chambersburg Formation, Maryland, USA. A. Holotype USNM 642510 showing the theca, proximal stem, and brachioles; general view of the complete specimen in ventral view (A1), detail of oral area and proximal part of the brachioles (A2), specimen in lateral view showing the periproct surrounded by three plates (A3). B. Paratype USNM 642513; general view of the complete specimen in ventral view (B1), note central plates in thecal interior, and single columnal attached to basals; detail of the anal pyramid on left edge (B2). Specimens whitened with ammonium chloride sublimate.