Gut glands illuminate trunk segmentation in Cambrian fuxianhuiids Javier Ortega-Hernández, Dongjing Fu, Xingliang Zhang, Degan Shu  Current Biology  Volume 28, Issue 4, Pages R146-R147 (February 2018) DOI: 10.1016/j.cub.2018.01.040 Copyright © 2018 Elsevier Ltd Terms and Conditions

Figure 1 Anatomy of the digestive tract of Fuxianhuia protensa from the early Cambrian (Stage 3) Chengjiang Lagerstätte. (A) ELI-TLP0004 part, complete specimen preserved in lateral view. (B) Magnification of midgut on limb-bearing trunk region with expanded tergopleurae; dotted line indicates tergite boundaries. (C) Magnification of gut on limb-less abdominal region. (D) BSE image of midgut gland highlighted in panel B. (E) EDS carbon elemental signal of panel D. (F) EDS iron elemental signal of panel D. (G) EDS silica elemental signal of panel D. (H) Morphological reconstruction of F. protensa illustrating external and internal segmental mismatch between the ancestral dorsal and derived ventral sides. Each pair of midgut diverticulae (purple) is confined within the boundaries of the dorsal exoskeleton. Each tergite covers multiple leg pairs, each associated with a condensed ganglion. Fuxianhuiid ventral nerve cord organization (yellow) in limb-bearing segments follows Yang et al. [5]. Abbreviations: abd, abdomen; ant, antennae; car, carapace; mgd, midgut diverticulae; Tn, tergite number. Current Biology 2018 28, R146-R147DOI: (10.1016/j.cub.2018.01.040) Copyright © 2018 Elsevier Ltd Terms and Conditions