Rhabdites occur in

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(A) Rhabdites are rod-shaped structures found in the epidermis of many turbellarian flatworms,such as $Planaria$ $(Dugesia)$.These structures are secr

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Planaria/Dugesia

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(A) Rhabdites are rod-shaped structures found in the epidermis of many turbellarian flatworms,such as $Planaria$ $(Dugesia)$.These structures are secreted by specialized cells called rhabdite cells.When the animal is irritated or threatened,these rhabdites are discharged to form a protective mucus layer,which helps in defense and locomotion.$Fasciola$,$Taenia$,and $Echinococcus$ belong to the class Trematoda and Cestoda,which are parasitic and lack these specific epidermal structures.

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