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The oldest known digestive system consisting of both paired digestive glands and a crop from exceptionally preserved trilobites of the Guanshan Biota (Early Cambrian, China)

Fig 3

Overview of soft-body preservation.

(A) Palaeolenus lantenoisi, GLF WLQ 174. (B) Elemental maps of Si (cyan) and Fe (yellow) overlain on SEM image of iron oxide framboids in crop of specimen shown in 3A. (C) Elemental maps of O (green) and Fe (yellow) overlain on SEM image of iron oxide framboids in crop of specimen shown in 3A. (D) Elemental map showing Fe concentration (yellow) at crop of specimen shown in 3A. There is no indication of iron in the center of the image because the framboids at the back of the cavity are outside the width of the detection field (see also 3B, 3C). (E) Elemental map showing Fe concentration (yellow) under left-hand side of doublure of cephalon, articulating half-rings on thoracic segments, and at crop for specimen shown in 3F. (F) Palaeolenus lantenoisi, GLF WLQ 214A. (G) Elemental map showing Fe concentration (yellow) at crop, posterior part of glabella, and palpebral lobe of specimen shown in 3I. (H) Elemental map showing Fe concentration (yellow) at thoracic and pygidial pleural spines of specimen shown in 3I. (I) Palaeolenus latenoisi, GLF WLQ 212A. (J) Redlichia mansuyi, GLF WLQ 245A. (K) Elemental map showing Fe concentration (yellow) at crop of specimen shown in 3J. Scale bar = 1 mm except where indicated. See Figs H-L in S1 File for additional elemental maps for these specimens. See Figs M-N in S1 File for additional elemental maps of pleural areas in Redlichia spp.

Fig 3

doi: https://doi.org/10.1371/journal.pone.0184982.g003