Where are rhabdites located?
turbellarians
Rhabdites (from Greek, rhabdos, rod) are rodlike structures in the cells of the epidermis or underlying parenchyma in certain turbellarians, and in the epidermis of nemerteans. They are discharged in mucous secretions.
What is rhabdites function?
It is proposed that the principal function of rhabdites in the worms studied, is adhesion. protection by means of mucus production, purine storage and excretion, cyst formation and the formation of a fluid cuticle (see summary and references in Horvasse, 1965).
What are rhabdites and their role in planarians?
InAlloioplana, Monocelis andPolychoerus the rhabdites are the only, or most common, secretory product released on the ventral locomotor sole and therefore they are thought to form the viscous mucus used in locomotion by ciliary gliding.
How do turbellarians eat?
Turbellarians eat both living and dead animal material. Some turbellarians secrete digestive enzymes onto their food, then ingest the already-digested food particles through their pharynx. Others digest food in their digestive cavity.
What is rhabdites in zoology?
Definition of rhabdite 1 : one of the minute, smooth, rodlike or fusiform structures produced in the cells of the epidermis or in cells sunk within the underlying parenchyma of many turbellarians and a few trematodes and discharged in great numbers in the mucous secretions of these animals.
What is syncytial epidermis?
Syncytial epidermis (multilayered epidermis) is found in the body wall of Ascaris. Syncytium is a multinucleate cell that is formed from multiple nuclear divisions without their accompanying cytokinesis. The vital feature of parasitic Platyhelminthes is Syncytial Epidermis.
What is Rhabdoid in planaria?
Any of the small rodlike structures which are secreted by the epidermis of turbellarian flatworms and dissolve to form a protective coating of mucus.
Where are turbellarians located?
Turbellarians lack a respiratory and circulatory system, so they are extremely thin and require aquatic (or very moist) habitats. They can be found in ponds, lakes, streams, springs, and even cave streams, usually in submerged leaf litter or under rocks.
What is the digestive organ of turbellarians?
The digestive system of turbellarians typically consists of mouth, pharynx, and intestine. In the order Acoela, however, only a mouth is present; food passes directly from the mouth into the parenchyma, to be absorbed by the mesenchymal cells. The excretory system consists of protonephridia.
How many epidermal cells are present in Rhabditis?
Rhabdites in some turbellarians, and in the epidermis of nemerteans, are rodlike structures in the cells of the epidermis or underlying parenchyma. They are released through mucous secretions. The rhabdites have 120 epidermal cells.
What is the meaning of syncytial?
(sin-SIH-shee-um) A large cell-like structure formed by the joining together of two or more cells. The plural is syncytia.
In which of these does the syncytial epidermis follow the cuticle?
The syncytial epidermis is present in Ascaris below the cuticle.