Carbon dioxide leaves the body by the same diffusion process. They lack circulatory and respiratory systems, and have a rudimentary excretory system.
Free-living, commensal or parasitic formThe excretory system consists of a single median protonephridia.Asexual fission occurs with the formation of the chain of zooids.Mostly free-living, some commensals or parasitic form.The anterior end of the body provided with 2-12 tentacles.Posterior end of the body provided with 1-2 adhesive discs.Pharynx simple, Bulbose or plicate; intestine straight or branched (short diverticula).The excretory system consists of paired protonephridia having 2 or 3 main branches and nephridiopores.Nervous system with 3or 4 pairs of longitudinal nerve cords provided with transverse connectives.The reproductive system consists of numerous testes and a pair of ovaries.Some are ectoparasitic or ectocommensals in the habit.Primitive female reproductive system, no female ducts.Male copulatory apparatus simple opening posteriorly.The female reproductive system consists of separate ovaries and yolk glands.Intestine with 3 branches, each with many diverticula.Protonephridia as lateral networks with many nephridiopores.The male reproductive system consists of 2 or numerous testes; a penis papilla present.The female reproductive organ consists of a pair of ovaries with yolk glands and a copulatory brusa.Typical penis papilla sometimes armed with the stylet.The nervous system consists of numerous radially arranged nerve cords.Eyes never occur as a pair of clusters on the anterior margin.A pair of marginal tentacles bearing eyes or a cluster of eyes at the anterior margin.Digestive tract incomplete consists of the anterior mouth, simple pharynx and two forked or many branches intestine; anus absent.Development direct (in ectoparasites) or indirect (in endoparasites) with alternation of hosts.Mostly ectoparasites in cold-blooded aquatic vertebrates.Anterior end provided with a pair of adhesive structures.Posterior end provided with an adhesive disc usually with hooks.Excretory pores paired situated anteriorly on the dorsal side.Vagina one or two. They are also called flukesCreate your own unique website with customizable templates. Tapeworms (Cestoda) are flatworms that tend to live in human and animal digestive tracks.
There is no circulatory or respiratory system in platyhelminthes, and these normal functions take place by absorption through the body wall. Platyhelminthes is another name for flatworms. They include a three cycle process, with the egg, larvae, and the adult stage. They breathe through their skin which they have to keep moist to keep diffusing … They also do not have a complex respiratory system only taking in oxygen through diffusion.Trematoda (Echinostoma Revolutum) are very small flat worms called flukes. Nonparasitic forms have a simple, incomplete gut; even this is lacking in many parasitic species. The animals of platyhelminthes lack circulatory and respiratory organs, which is why their bodies are so flat. They have no respiratory organs and also obtain oxygen through gas exchange. Flatworms can be parasites and very dangerous to human beings. There are only 20,000 known species in this phylum. Planaria lacks a specialized respiratory system. A phylum is the second least specific classification in taxonomy or the classification of living things.
They breathe through their skin which they have to keep moist to keep diffusing water across.
They don't have a complex respiratory system. There are approximately 20,000 species of the phylum, Platyhelminthes. Planaria and other flatworms are flat to be thin enough for diffusion of gases to occur accross their skin. This is because they are very simple animals. They are produced separately in the yolk or vitelline glands.Fertilization is internal but cross-fertilization in trematodes and self-fertilization in cestodes.Their life cycle is complicated involves one or more hosts.Parthenogenesis and polyembryony commonly occur trematodes and tapeworms.Some tapeworm propagates by endogenous or exogenous budding.The flatworm is either free-living or ecto-or endocommensals or parasitic.The classification is from Hyman, L.H., (1951) up to suborder only with certain modifications.Mostly free-living but some ectocommensals and endocommensals or parasitic calledBody unsegmented and covered with ciliated cellular or syncytial epidermis, containing mucus-secreting cells and rod-shaped body calledMouth ventral.
Respiratory System 8. PLATYHELMINTHES. This phylum consists of are a phylum of relatively simple unsegmented, soft-bodied invertebrate animals. They have a cephalized nervous system.
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