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Fig 10 | BMC Evolutionary Biology

Fig 10

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 10

Metamorphic remodeling of the circulatory system in Phoronopsis harmeri. a Photographs of live 4-h-old juvenile with formed ventral blood vessel (vv). b Picture of 4-h-old juvenile with lophophoral (lv) and ventral blood vessels. c Ultrastructural organization of the ventral blood vessel. Cells (emc), which form muscular lining of the esophagus (es), form the inner lining of the ventral blood vessel. d Degeneration of muscle cells (dmc), which form the inner lining of the ventral blood vessel; the formation of long protrusions (are shown by arrowheads) of the basal lamina (bl). e The median blood vessel has a very complex wall along the upper portion of the esophagus. The wall is formed by lining of the metacoel (lc3) and two layers of the mesocoel lining (lc2). The muscle cells (emc) of the esophagus (es) form inner lining of the vessel. Desmosomes between cells of mesocoel lining are indicated by double arrowheads. Abbreviations: am – ampulla; cap – blood capillaries; c3 – metacoel; er – erythrocytes; pb – posterior bulge; sd – stomach diverticulum

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