Abstract
The Turbellaria are acoelomate, triploblastic, unsegmented and bilaterally symmetrical animals, with distinct anteroposterior polarity expressed in head, trunk and tail regions that are not markedly distinguishable. With the exception of the Acoela, which have a solid mass of digestive tissue, the Turbellaria are characterized by a pharynx and a blind gut (no anus). Circulatory and respiratory organs are absent, and excretory organs consist of protonephridia. A solid mass of tissue, called mesenchyme or parenchyma fills the space between the cellular, monoestratified, ciliated epidermis and the gut and surrounds the internal organs. It consists of several non proliferating differentiated cell types and a particular class of undifferentiated mitotic cells usually called neoblasts (for a quantitative analysis of cell types, see Baguña and Romero, 1981; Romero, 1987).
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Baguñà, J., Boyer, B.C. (1990). Descriptive and Experimental Embryology of the Turbellaria: Present Knowledge, Open Questions and Future Trends. In: Marthy, HJ. (eds) Experimental Embryology in Aquatic Plants and Animals. NATO ASI Series, vol 195. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3830-1_6
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DOI: https://doi.org/10.1007/978-1-4615-3830-1_6
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