FIGURE 6 in Two new species of Oregodasys (Gastrotricha: Macrodasyida: Thaumastodermatidae) from Carrie Bow Cay, Belize with ultrastructural observations of the epidermal glandular system

FIGURE 6. Ultrastructure of the bodywall of Oregodasys katharinae sp. nov. A Section through the dorsal epidermis (ep) at the level of the pharynx (ph). B Closeup of the apical region of the dorsal epidermis showing rod-like secretory inclusions (rd) below the plasma membrane. A single electron-dense element (ede) is present within the endocuticle. C Longitudinal section through two adjacent epidermal glands showing the apical pore (po) and numerous secretory vesicles (sv) with different staining characterstics. D Apical end of an epidermal gland showing the microvillar collar (mv) that forms the apical pore. The overlying exocuticle (ex) and endocuticle (ed) are generally thickest around the papillary glands. Note the presence of a portion of a striated rootlet (sr) at the base of the photograph. E Section through an insunk epidermal gland. Note the elongate gland neck (gn) between epidermal cells that leads to a small pore (po). Electron-dense elements are abundant in the endocuticle around insunk epidermal glands. F Longitudinal section through a portion of a papilla that contains two cell types: a porous cell with an apical opening and large nucleus (nu) on the left, and a sensory cell with a striated rootlet (sr) and apical cilium (out of the field of view) on the right.