WebFlatworms have three embryonic tissue layers that give rise to epidermal tissues (from ectoderm), the lining of the digestive system (from endoderm), and other internal tissues (from mesoderm). ... Two large cerebral … Webganglia. The nervous system is controlled by a small brain called the _____, two masses of nerve cells. ... Regeneration, flatworms can deliberately tear itself in half and reproduce …
Flatworm - Organ systems Britannica
Free-living flatworms are mostly predators, and live in water or in shaded, humid terrestrial environments, such as leaf litter. Cestodes (tapeworms) and trematodes (flukes) have complex life-cycles, with mature stages that live as parasites in the digestive systems of fish or land vertebrates , and … See more The flatworms, flat worms, Platyhelminthes, or platyhelminths (from the Greek πλατύ, platy, meaning "flat" and ἕλμινς (root: ἑλμινθ-), helminth-, meaning "worm") are a phylum of relatively simple bilaterian See more Distinguishing features Platyhelminthes are bilaterally symmetrical animals: their left and right sides are mirror images of … See more The relationships of Platyhelminthes to other Bilateria are shown in the phylogenetic tree: The internal relationships of Platyhelminthes are shown below. The tree is not fully resolved. The oldest … See more Parasitism Cestodes (tapeworms) and digeneans (flukes) cause diseases in humans and their See more Early classification divided the flatworms in four groups: Turbellaria, Trematoda, Monogenea and Cestoda. This classification had long been recognized to be artificial, and in 1985, Ehlers proposed a phylogenetically more correct classification, … See more An outline of the origins of the parasitic life style has been proposed; epithelial feeding monopisthocotyleans on fish hosts are basal in the Neodermata and were the first shift to parasitism … See more • Miracidium • Regenerative medicine • Schistosoma See more WebApr 8, 2024 · Flatworms: Platyhelminthes (flatworms) have a more complex nervous system than Acoela and are lightly cephalized, with an eyespot above the brain near the front end, ... Insect brains are strongly cephalized, with three fused ganglia attached to the ventral nerve cord, which has a pair of ganglia in each segment of the thorax and … refreshment in accounting
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WebSome turbellarians have a more centralized nerve system. It composed of with cerebral ganglia. Several pairs of long nerve cords and sub-epidermal nerve net. It is found in … Webessentially the same in all 3 classes of flatworms. In general it consists of a pair of cerebral ganglia, joined by a commissure, located somewhere in the anterior one-third of the animal. Except for the most advanced turbellarians, the ganglia ap-parently lack a sheath (Fairweather and Thread-gold, 1983; Sukhdeo et al., 1988b). WebWhat is ganglia? _____ Do flatworms have ganglia? _____ 12. What structure detects light in a flatworm? _____ 13. Use Fig 27-3 to help you label the flatworm. 14. What is a hermaphrodite? _____ 15. _____is … refreshment ideas for events