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    Invert Lab 2

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    Beruk Berhane
    The document summarizes key characteristics of four phyla of invertebrates: Turbellaria, Trematoda, Monogenea, and Cestoda. Turbellaria are free-living flatworms found in marine, freshwater, and terrestrial environments. Trematoda are parasitic flukes with a complex life cycle involving intermediate hosts. Monogenea are host-specific ecto- or endoparasites of fish and aquatic animals. Cestoda are parasitic tapeworms with a long, segmented body and no digestive system, absorbing nutrients via diffusion.

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    Invert Lab 2

    Uploaded by

    Beruk Berhane
    89 views1 page
    The document summarizes key characteristics of four phyla of invertebrates: Turbellaria, Trematoda, Monogenea, and Cestoda. Turbellaria are free-living flatworms found in marine, freshwater, and terrestrial environments. Trematoda are parasitic flukes with a complex life cycle involving intermediate hosts. Monogenea are host-specific ecto- or endoparasites of fish and aquatic animals. Cestoda are parasitic tapeworms with a long, segmented body and no digestive system, absorbing nutrients via diffusion.

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    The document summarizes key characteristics of four phyla of invertebrates: Turbellaria, Trematoda, Monogenea, and Cestoda. Turbellaria are free-living flatworms found in marine, freshwater, and terrestrial environments. Trematoda are parasitic flukes with a complex life cycle involving intermediate hosts. Monogenea are host-specific ecto- or endoparasites of fish and aquatic animals. Cestoda are parasitic tapeworms with a long, segmented body and no digestive system, absorbing nutrients via diffusion.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    89 views1 page

    Invert Lab 2

    Uploaded by

    Beruk Berhane
    The document summarizes key characteristics of four phyla of invertebrates: Turbellaria, Trematoda, Monogenea, and Cestoda. Turbellaria are free-living flatworms found in marine, freshwater, and terrestrial environments. Trematoda are parasitic flukes with a complex life cycle involving intermediate hosts. Monogenea are host-specific ecto- or endoparasites of fish and aquatic animals. Cestoda are parasitic tapeworms with a long, segmented body and no digestive system, absorbing nutrients via diffusion.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 1

    Invertebrate Zoology

    Lab report 2
    Characteristics Turbellaria Trematoda Monogenea Cestoda
    Mode of life free-living; Parasitic flukes; Host-specific Parasitic
    Marine; fresh between life ectoparasites or tapeworms;
    water; terrestrial cycles endo or endoparasites
    ectoparasites
    Body wall structure Two layer of Flattened leaf- Dorsoventrally Long and dorsally
    muscle tissue shaped body; flattened with a and ventrally
    below the thick cuticle to posterior flattened with a
    ectoderm layer; prevent attachment organ tough integument
    dorsoventrally digestion by the known as haptor to prevent being
    flattened shape host digested by host
    Digestive System Mouth on ventral Muscular Similar to that of Absent. Instead,
    surface; muscular pharynx sucks up Digenea; secreates nutrients enter by
    pharynx; blood via mouth protease that diffusion
    gastrovascular and into digest the host’s
    cavity gastrovascular skin allowing the
    cavity where it is parasite to ingest
    digested blood; no anus
    Nervous system Cephalized; Nervous & Exhibits Reduced or absent
    anterior end muscular system cephalization; in some cases
    contains eye spots is greatly most sensory &
    sensitive to light & reduced or nervous tissue at
    pointed lobes are absent the anterior end
    sensitive to touch;
    Ganglia attached
    to a pair of ventral
    nerve cords
    Excretory system Composed of Flame cells; Simple excretory Similar to other
    flame cells, protonephredia system known as platyhelminthes,
    excretory tubules, flame cell- use flame cells.
    and excretory protonephridial
    pores
    Reproductive Asexual: binary Hermaphrodites One egg develops Reproductive
    System fission and into a ciliated organs are found
    sexually: hooked in proglottids;
    hermaphrodites oncomiracidium Hermaphrodites
    Larval stage Larval epidermis Larva has 3 Ciliated larval
    is a combination separated groups epidermis
    of ciliated cells of epidermal syncytial (not a
    an syncytial ciliated bands neodermis)
    neodermis separated by a
    nonciliated
    epidermal
    syncytium

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