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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Representative pseudocoelmate phyla

Nematoda

Nematomorpha

Acanthocephala

Rotifera

Representative Pseudocoelmate Phyla


Pseudocoelomates

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

Taxonomy

  • Phylum Nematomorpha

  • Phylum Acanthocephala

  • Phylum Rotifera

    • Philodina

  • Phylum Nematoda

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


Phylum nematomorpha

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.


Phylum acanthocephala

Taxonomy

Phylum Acanthocephala

  • Have a short anterior proboscis covered with recurved spines

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


Phylum rotifera

Taxonomy

Phylum Rotifera

  • Genus - Philodina

  • Some unique characteristics

    • Mastax

    • Ciliated corona

    • Toes

    • Parthenogenesis


Phylum nematoda

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

Systems of Nematoda

  • System I

    • Integumentary, skeletal, muscle and digestive

  • System II

    • Excretory, respiratory, circulatory and nervous

  • System III

    • Endocrine and reproductive


Systems i

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


Systems ii

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


Systems 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


Representative genera of nematoda

Ascaris

Enterobius

Necator

Ancylostoma

Wuchereria

Dracunculus

Turbatrix

Dirofilaria

Trichinella

Taxonomy

Representative Genera of Nematoda


Genus ascaris

Taxonomy

Genus Ascaris

Dissection

Male

  • Intestinal roundworm

    • Ingested as eggs in contaminated food or dirt


Dissection ascaris female

Taxonomy

Dissection Ascaris female


Ascaris male copulatory spicule

Taxonomy

Ascaris male copulatory spicule


Genus ancylostoma

Taxonomy

Dog

Hookworms

Mouth

Copulatory structure of male

Genus Ancylostoma

Hookworm infected by juveniles in soil burrowing into skin.


Genus dirofilaria dog heart worms

Taxonomy

Genus Dirofilaria (dog heart worms)

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

They are transmitted by mosquitoes.


Trichinella

Taxonomy

Encysted stage

In pork

Trichinella

END


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