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Nematoda. Jenny Brooke David Thursday, September 18, 2014 Period 1. http://www.stanford.edu/group/parasites/ParaSites2006/Loiasis/Home.html. Sample Animals and Pictures. Caenorhabditis elegans Tricinella spiralis. David Dallas-Orr. Body Cavity (coelom) present or absent. Have a coelom

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nematoda

Nematoda

Jenny Brooke David

Thursday, September 18, 2014

Period 1

http://www.stanford.edu/group/parasites/ParaSites2006/Loiasis/Home.html

sample animals and pictures
Sample Animals and Pictures
  • Caenorhabditis elegans
  • Tricinella spiralis

David Dallas-Orr

body cavity coelom present or absent
Body Cavity (coelom) present or absent
  • Have a coelom
  • Nutrients are transported in the fluid in the pseudocoelom
  • The fluid under high pressure

David Dallas-Orr

body symmetry
Body Symmetry
  • Bilaterally symmetrical

David Dallas-Orr

nervous system
Nervous System
  • Nematodes have a reasonably well developed nervous system.
  • This is comprised of a circum-pharyngeal nerve ring made up from 4 nerve ganglia from which 6 longitudinal nerves extend down through the body
  • There are also 6 shorter nerves which extend forwards towards the mouth.

David Dallas-Orr

circulatory system
Circulatory System
  • Lacks a circulatory

system

David Dallas-Orr

digestive system
Digestive System
  • Alimentary canal: digestive canal issuing a track from mouth to anus

http://classes.seattleu.edu/biology/biol235/hodin/nematodePriapulidGroup/nematodes/formAndFunction.htm#excretory

Pathway of food: mouth (stoma)  pharynx  intestines  rectum  anus

Jenny Kim

excretory system
Excretory System
  • Nitrogenous waste is excreted through body wall
  • Rennette gland to excrete salt to maintain osmoregulation.

Jenny Kim

locomotion musculature
Locomotion/Musculature
  • Only longitudinal muscles for movement
  • Moves by undulations or wave-like motions of the body. This produces a thrashing movement.

http://classes.seattleu.edu/biology/biol235/hodin/nematodePriapulidGroup/nematodes/locomotion.htm

Jenny Kim

skeletal type
Skeletal Type
  • Hydostatic skeleton: Non-compressible fluid enclosed and pressurized in body cavity.
  • Tough cuticle that coats body
  • Cylindrical and un-segmented

http://www.newscientist.com/gallery/mg20327161300-enemy-within-human-parasites/3

Jenny Kim

sensory structures features
Nematodes have peripherally located sense organs.

Recent studies revealed the presence of true cilia in nerve processes connected with sensory organs.

The body is covered in sensory bristles and papillae that provide a sense of touch.

SENSORY STRUCTURES/FEATURES

http://www.ucmp.berkeley.edu/phyla/ecdysozoa/nematoda.html

Brooke Goycochea.

reproduction
A female may deposit 100,000 or more fertilized eggs per day.

Different species of nematodes have various ranges of modes of reproduction.

Reproduction is usually sexual and most nematode species are dioecious.  Some species, however, are hermaphroditic.

REPRODUCTION

http://w3.rennes.inra.fr/umrbio3pE/equipes/nematodes/images/lamelle-460.jpg

Brooke Goycochea.

gas exchange
Have an alimentary canal but no circulatory system.

Respiration and gas exchange occur by diffusion across the body wall.

Both anaerobic and aerobic metabolism is common.

GAS EXCHANGE

http://www.ars-grin.gov/ars/SoAtlantic/fp/stpp/burelle/nematode.jpg

Brooke Goycochea.

unique features of nematodes
About 25,000 species are known but about 20 times more exist. There is little known about each nematode species even though they are numerous.

It is said that if nothing but nematodes existed, they would preserve the outline of Earth and its many features.

Humans host at least 50 nematode species.

Unique Features of Nematodes

http://www.ucmp.berkeley.edu/phyla/ecdysozoa/nematodesm.jpg

Brooke Goycochea

slide15
Quiz
  • 1. Which of the following do not have a Hydrostatic skeleton for support?
  • A. Cnidaria
  • B. Platyhelminthes
  • C. Nematoda
  • D. Annalida
  • 2. Which of the following have a circulartory system?
  • A. Cnidaria
  • B. Platyhelminthes
  • C. Nematoda
  • D. Annalida
  • 3. Which of the following does not has a different body symmetry in the group listed below?
  • A. Cnidaria
  • B. Mollusca
  • C. Nematoda
  • D. Chordata
  • What type of body symmetry does each of the different phyla have? (listed above)
slide16
Quiz
  • 1. Which of the following do not have a Hydrostatic skeleton for support?
  • A. Cnidaria
  • B. Platyhelminthes
  • C. Nematoda
  • D. Annalida
  • 2. Which of the following have a circulartory system?
  • A. Cnidaria
  • B. Platyhelminthes
  • C. Nematoda
  • D. Annalida
  • 3. Which of the following does not has a different body symmetry in the group listed below?
  • A. Cnidaria
  • B. Mollusca
  • C. Nematoda
  • D. Chordata
  • What type of body symmetry does each of the different phyla have? (listed above)
  • A - Radial B,C,D – Bilateral
bibliography for beginning pix
Bibliography for beginning pix
  • http://riddlelab.msl.ubc.ca/images/maincelegans.jpg
  • http://images.google.com/imgres?imgurl=http://workforce.cup.edu/buckelew/images/Trichinella%2520spiralis%2520male.jpg&imgrefurl=http://workforce.cup.edu/buckelew/Trichinella%2520spiralis%2520male.htm&usg=__-N5OebYUengR9rzBklrnegm5b0Q=&h=512&w=640&sz=27&hl=en&start=1&um=1&itbs=1&tbnid=To3n2v9H1z6ALM:&tbnh=110&tbnw=137&prev=/images%3Fq%3DTrichinella%2Bspiralis%26um%3D1%26hl%3Den%26sa%3DG%26ndsp%3D20%26tbs%3Disch:1
  • http://www.cals.ncsu.edu/course/zo150/mozley/fall/nematode.jpg
  • http://www.nottingham.ac.uk/bennett-lab/nematode.jpg
  • http://web.pml.ac.uk/nematode/pictures/images/nematode5.jpg