Fig. 9

Metamorphic remodeling of the body cavities in anterior part of the body in Phoronopsis harmeri. Histological sagittal sections. The apical is to the top; the oral side is at the right; the anal side is at the left. Color code: red – blastocoel, which partly gives rise to the blood system; cyan – protocoel; blue – mesocoel; green – metacoel. a Metamorphic animal at stage of eating of the preoral lobe and the postoral ciliated band: about 10–15 min after the onset of metamorphosis. The degenerated preoral lobe (dpl) and ropes of the postoral ciliated (rpb) band are visible in the section. b 4-h-old juvenile with completely obliterated blastocoel and thick basal lamina (bl) instead of it. The lining of the posterior portion of the larval metacoel, which separate from the lamina and float in the metacoel, are indicated by double arrowheads. Abbreviations: bc – blastocoel; c1 – protocoel; c2 – mesocoel; c3 – metacoel; es – esophagus; pb – posterior bulge; pr – proctodaeum; tt – telotroch; vv – ventral vessel