Representative pseudocoelmate phyla
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Nematoda. Nematomorpha. Acanthocephala. Rotifera. Representative Pseudocoelmate Phyla. Pseudocoelomates. The phyla are eumetatzoans , have bilateral symmetry (grade Bilateria ) and are in division Protostomia .

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Representative Pseudocoelmate Phyla

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Nematoda

Nematomorpha

Acanthocephala

Rotifera

Representative Pseudocoelmate Phyla


Pseudocoelomates

  • The phyla are eumetatzoans, have bilateral symmetry (grade Bilateria) and are in division Protostomia.

  • The blastocoel of the embryo is the body cavity. The body cavity is not lined with a mesoderm.


Taxonomy

  • Phylum Nematomorpha

  • Phylum Acanthocephala

  • Phylum Rotifera

    • Philodina

  • Phylum Nematoda

    • Ascaris, Enterobius, Necator, Ancylostoma, Wuchereria, Dracunculus, Turbatrix, Dirofilaria, Trichinella


Taxonomy

Phylum Nematomorpha

  • Larva parasites arthropods

  • Adults free-living in freshwater (do not feed)

  • Works are striking because of the extremely long and threadlike body.


Taxonomy

Phylum Acanthocephala

  • Have a short anterior proboscis covered with recurved spines

  • Has ability to secrete chemicals that modify the behavior of host species.


Taxonomy

Phylum Rotifera

  • Genus - Philodina

  • Some unique characteristics

    • Mastax

    • Ciliated corona

    • Toes

    • Parthenogenesis


Systems

Taxonomy

Carrot root

nematodes

Heart worms

(Dirofilaria)

Pepper

nematodes

Phylum Nematoda

  • Some characteristics

    • Amoeboid sperm

    • Longitudinal muscle only

    • Muscle attach to nerves

    • 6-layered cuticle


Systems of Nematoda

  • System I

    • Integumentary, skeletal, muscle and digestive

  • System II

    • Excretory, respiratory, circulatory and nervous

  • System III

    • Endocrine and reproductive


Taxonomy

Systems I

  • Integumentary - syncytial, one cell layer; secretes 6-layered cuticle.

  • Skeletal - hydrostatic

  • Muscle - longitudinal muscle only, muscles send fibers to nerves

  • Digestive - complete but not complex; mouth pharynx, intestine, anus; no digestive glands

System II

System III


Taxonomy

Systems II

  • Excretory - excretory tubes and renette glands probably remnants of flame cells like system.

  • Respiratory - none; many are anaerobic

  • Circulatory - none; use pseudocoelom

  • Nervous - nerve ring around pharynx; dorsal and ventral cords with lateral lines

System III


Taxonomy

Systems III

  • Endocrine - chemicals secreted by nervous system

  • Reproductive - Mostly dioecious

    • Sexual dimorphism - male usually smaller and has copulatory structure

    • Amoeboid sperm

    • Many with complex life cycles - particularly the parasites


Ascaris

Enterobius

Necator

Ancylostoma

Wuchereria

Dracunculus

Turbatrix

Dirofilaria

Trichinella

Taxonomy

Representative Genera of Nematoda


Taxonomy

Genus Ascaris

Dissection

Male

  • Intestinal roundworm

    • Ingested as eggs in contaminated food or dirt


Taxonomy

Dissection Ascaris female


Taxonomy

Ascaris male copulatory spicule


Taxonomy

Dog

Hookworms

Mouth

Copulatory structure of male

Genus Ancylostoma

Hookworm infected by juveniles in soil burrowing into skin.


Taxonomy

Genus Dirofilaria (dog heart worms)

Adult worms live in heart while the juveniles circulate in blood.

They are transmitted by mosquitoes.


Taxonomy

Encysted stage

In pork

Trichinella

END


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