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Fig. 11 | BMC Evolutionary Biology

Fig. 11

From: Metamorphic remodeling of morphology and the body cavity in Phoronopsis harmeri (Lophotrochozoa, Phoronida): the evolution of the phoronid body plan and life cycle

Fig. 11

Organization of the protocoel at first stage of metamorphosis of Phoronopsis harmeri. a Sagittal semithin section of the protocoel (c1). Degenerated epithelium of the preoral lobe (dpl) is above the protocoel. Thick protrusions of basal lamina are indicated by arrowheads. b Thin section of the protocoel lateral wall, which includes large bundle of muscle cells. c Thin section of the protocoel lower wall. It contacts the esophagus (es) and muscle cells, which form the musculature (emc) of the esophagus. Desmosomes between cells of the protocoel lining are shown by double arrowheads. d The protocoel upper wall is formed by myoepithelial cells. Abbreviations: bb – basal body; bc – blastocoel; bl – basal lamina; lc1 – lining of protocoel; mc – muscular basal protrusions of cells of protocoel lining; rer – rough endoplasmic reticulum; sr – striated rootlet

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BMC Ecology and Evolution

ISSN: 2730-7182

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