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Fig. 7 | BMC Evolutionary Biology

Fig. 7

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. 7

Ultrastructural remodeling of integument during metamorphosis of Phoronopsis harmeri. Stage about 15 min after the onset of metamorphosis. a Epithelium (ep) and basal lamina (bl) of the oral disc. Thick electron dense fibrils are indicated by arrowheads. b Thick extracellular matrix (ECM), numerous protrusions of the basal lamina, and degenerated muscle cells in the preoral lobe near the protocoel. c The basal lamina forms long protrusions, which penetrate profoundly into the ECM. Thick electron dense fibrils are indicated by arrowheads. Abbreviations: dep – degenerated epithelium; lc1 – lining of the protocoel; pao – pilled apical organ; tf – thick electron dense fibrils

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