Figure 2

Schematic representation of cross-sections summarizing tissue development in Buddenbrockia worms. (A) Early stage with parenchymatous inner compartment. (B) Worm with inner epithelial tissue and muscle precursors. (C) Worm with musculature and inner epithelial tissue differentiated into connecting cells and sporogonic cells. (D) Worm with disintegrated inner tissue. cc, connecting cell; cl, central lumen; ecm, extracellular matrix; ep, epidermis; ie, inner epithelium; mb, muscle block; mp, muscle precursor; sc, sporogonic cell.