Fine structural observations on the ciliary receptors in the epidermis of three otoplanid species (Turbellaria proseriata).
In Notocaryoturbella bigermaria, Otoplana truncaspina and Paroto-planella heterorhabditica three types of epidermal receptors are recognized. Type I: with a single cilium running in a duct, piercing the distal dendrite process of the receptor. The internal wall of the dendrite process has eight ridges with longitudinal filaments lying inside them. The ciliary basal body lacks a longitudinal rootlet but is encircled by a thin annular formation. Type II: with a single (A) or several (B) cilia which protrude from the outer epithelial surface and are provided with a large and striped rootlet. Both types are considered as mechanoreceptors. Type III: with two or more short and stumpy cilia devoid of rootlets and displaying the usual 9 + 2 pattern in the proximal part only. They are considered as chemoreceptors.
D000818:Animals; D002923:Cilia / Q000648:ultrastructure*; D003712:Dendrites / Q000648:ultrastructure; D004848:Epithelium / Q000648:ultrastructure; D008465:Mechanoreceptors / Q000502:physiology; D010986:Platyhelminths / Q000648:ultrastructure*; D011955:Receptors, Drug; D011984:Sensory Receptor Cells / Q000502:physiology / Q000648:ultrastructure*
D011955:Receptors, Drug