Flatworm Carolina Marques (2012)
Body Wall: Turbellarians have a monolayered epidermis that holds numerous cilia and lack cuticle (Ruppert et al, 2004). They usually have diverse glands that can secrete adhesive substances, mucus and even rod-shaped structures called rhabdoids (Liana et al., 2011). From cross sections of the P. pudhoei’s body it is possible to observe a higher concentration of cilia on the ventral surface than on the dorsal one, which can be explained by the fact that these cilia are related to locomotion over substrates. We can also identify a basal lamina and a well developed parenchyma, which consists of connective tissue between the body wall and the gut (Fig.5.1 A, B e C).
Nervous and Sensory System: Polyclads have a diffuse, netlike nervous system with a ringlike brain and longitudinal nerve cords that join the nerve nets (Fig. 5.3) (Ruppert et al, 2004). Pseudoceros have pigment-cup ocelli organized in clusters over the brain (cerebral eyes) and in the tentacles (pseudotentacular eyes) that detect the presence and absence of light (Fig. 5.4) (Sopott-Ehlers,1991).
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