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9 Jun 2017 General characteristics of phylum Platyhelminthes In tapeworms, Direct absorption of soluble nutrients by cells and tissues. Hooks and sucker usually absent; Examples: Planaria, Bipalium, Otoplana, Notoplana Hoo
Annelida. Members of this phylum may be most familiar: the common earthworm, leech and nightcrawler belong to this group. There are three general types of segmented worms. One group is entirely marine (the polychaetes), while the other two groups are either terrestrial or live in freshwater.
The most important and a common characteristic of all organisms belonging to this phylum is that their bodies are dorso-ventally flattened. The bodies of the organisms belonging to this phylum are flat since they do not have a body cavity and are acoelomate. Planarians and tapeworms are two types of flatworms that belong to phylum Platyhelminthes. Planarians are unsegmented flatworms, which are free living.
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 intermediate stages that infest secondary hosts. Tapeworms live in which body organ?
As we will see later in this chapter, chordates, the phylum to which we belong, generally develop Most flatworms, such as the planarian shown in (Figure), have a branching One parasitic group, the tapeworms (cestodes), lacks a di
Tape worm (Taenia solium) Parasitic adaption. The parasitic adaptations of flatworms are as following. 1.
The liver fluke belongs to the phylum Platyhelminthes. All flukes in this phylum belong to a group referred to as trematodes. What phylum does the liver fluke belong in? Liver flukes are a
Hence they do not have segmented body. Segmented body is a characteristic feature of phylum annelida and phylum arthropoda.
Tapeworm, liver fluke and planarian belong to the p hylum Platyhelminthes.
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The most common species studied in the lab is the brown planaria, Dugesia. Tapeworms. Tapeworms (Cestoda) are a highly diversified group of ubiquitous endoparasites that generally have a two-phase life cycle: vertebrates serve as final hosts and all orders may utilize arthropods, other invertebrates or even vertebrates as first intermediate hosts with the sole exception of the Caryophyllidea, whose eggs only infect oligocheate annelids.
So, the correct answer is option B.
Phylum Platyhelminthes The flatworms include more than 13,000 species of free-living and parasitic species. There are 3 classes of flat-worms, the planarians, flukes and tapeworms. General Physical Traits (Anatomy): Flatworms are bilaterally symmetrical. This means that they can only be cut them length-wise to produce two mirror-image halves.
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Phylum Platyhelminthes The Flatworms Phylum Platyhelminthes About 20,000 species About 80% of parasites are from this phylum Divided into three major groups Free-living flatworms Parasitic tapeworms Parasitic flukes Flatworms Range in size Some microscopic free-living forms Parasitic forms over 20 meters long Show many advances over Cnidaria General Characteristics The following
Examples of Phylum Platyhelminthes. 1. Planaria (Dugesia) 2. Liver fluke 3. Tape worm (Taenia solium) Parasitic adaption. The parasitic adaptations of flatworms are as following.
Phylum Platyhelminthes. The flatworms are acoelomate organisms that include many free-living and parasitic forms. The flatworms possess neither a lophophore nor trochophore larvae, although the larvae of one group of flatworms, the Polycladida (named after its many-branched digestive tract), are considered to be homologous to trochophore larvae.
They can be freshwater or marine. Some are parasitic and live within other organisms. Traits: Platyhelminthes are multicellular. Second, they have bilateral symmetry. In other words, they have a left and right half.
Class Cestodae – example tapeworms - Planarians are free living and not parasitic. Other classes of their phylum, including flukes and tapeworms, are parasitic when they live inside another organism. Phylum platyhelminthes 1. FLATWORMS Kingdom Animalia Phylum Platyhelminthes Ex. Planaria, flukes and tapeworms Class Cestoda Class Turbellaria Class Trematoda 2. Characteristics of Platyhelminthes • Body symmetery: bilateral • Body organization: triploblastic (3 layers) – Ectoderm – Mesoderm (first!!) They live in an aquatic environment (freshwater or marine) or on moist soil. Both tapeworms and flukes are internal parasites that inhabit a host’s tissues, cavities in body organs, or blood vessels.