Fig. 6.

Light micrographs of cross sections of all oral sensory organs (oso) in a specimen of Bathochordaeus stygius. oso_ar/l: anterior oral sensory organ of the right/left side, oso_lr/l: lateral oral sensory organ of the right/left side, oso_ir/l: inner oral sensory organ of the right/left side. Note that oso_al contains three clusters of sensory cells, oso_al1-3. The apical openings in the epidermis covering of oso_al1-3 are depicted in Additional file 2: Figure S2. aj—apical junctions, ec—epidermis cell, ep—epidermis, hr—house rudiment, icm—intracellular matrix, ne—neurites, nu—nucleus, sc—sensory cell