Filo Nematoda y otros roundworms Nematod are the most diverse phylum of pseudocoelomates, and one of...
Transcript of Filo Nematoda y otros roundworms Nematod are the most diverse phylum of pseudocoelomates, and one of...
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LABORATORIO:Parte2
FiloNematodayotros
EJERCICIO10
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Goalsfortoday
• LearntorecognizedthePhylumNematodaandothersmallerphylafromotheranimals
• Learnthemain‘diagnos>c’characteris>cs
• Learnaboutsomefree‐livingandparasi>cspeciesbiology
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Nematoda:roundworms
Nematod are the most diverse phylum of pseudocoelomates, and one of the most diverse of all animals
KeycharacterisBcsofthephylum:• Bodyelongateandroundbody.
• Unsegmented• Cu>cle
• Nervoussystemwithpharyngealnervering
• Hasnotcirculatorysystem
• Unlikecnidariansorflatworms,roundwormshaveadiges>vesystemthatislikeatubewithopeningsatbothends.
• Pseudocoelomate• Widespreadandabundantinallhabitats;
someparasi>c
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Nematoda:YourTasksExercise9A:
– Phylum:Nematoda• Genus:Ascarislumbricoides,A.suum
Ascaris lumbricoides is a common intestinal parasite of humans. A. suum paralyzes pigs. Nearly ¼ of the human population is infected with this roundworm. The eggs are resistant to chemicals, remaining viable in 2% formalin, and 50% solutions of the common laboratory acids
So be careful!! Use gloves and wash your hands after the dissection
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Nematoda:Ascaris1.Takeaslidefromyourboxwithacrosssec>onofamaleandfemaleAscaris.
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Nematoda:Ascaris2.Dissec>on.Useglovesatall>mes!
Female
Male
Select one sex and then search for student the a dissection of the opposite sex. Either can be in the exam!
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Ascarislumbricoidescont.
Female
vagina
genital pore
uterus
gut oviduct
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Ascarislumbricoidescont.
seminal vesicle sperm duct
testes gut
Male
Male spicules
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Nematoda:YourTasksExercise9A:
– Phylum:Nematoda• Genus:Ancylostomacaninum(doghookworm)
Observe a slide of the dog hookworm. This is a common parasite of domestic dogs and cats. Try to note the cutting plates which uses to attach itself to the intestinal mucosa of its host.
Read page 161 on hookworms
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Nematoda:YourTasksExercise9A:
– Phylum:Nematoda• Genus:Trichinellsspiralis(trichinaworm)
Observe a slide of the trichina worm a parasite of humans, hogs, rats and other mammals
Your slide is a cyst of the parasite
Read page 162 on trichina worms
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Nematoda:YourTasksExercise9A:
– Phylum:Nematoda• Genus:Enterobiusvermicularis(pinworms)
Observe a slide of a pinworm which parasites humans in USA. The live in the large intestine and cecum.
Read page 162-163 on pinworms
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Nematoda:YourTasksExercise9A:
– Phylum:RoBfera
Observe a slide of a rotifer: Rotifers have a corona of cilia that is use for swimming and feeding. The foot has a pedal gland that secrets a cement to cling on substrate. The mastax is fitted with jaws for grinding food particles. The body is cover by a cuticle which in many roftifers is rigid and called lorica.
Therearepseudocoelomates
Habitanenaguasdulces,>errahúmeda,musgos,líquenes,hongos,einclusoaguasalada
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Nematoda:YourTasksExercise9A:
– Phylum:Acanthocephala
Observe a slide of a spiny-headed worm. This worm is a parasite of pigs, where it attaches to the intestinal lining and absorbs digested food from its host. Like tapeworms it has not digestive system at all.
probóscide invaginable erizada de espinas
Therearepseudocoelomates
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ImportantLinksNematods and others
http://faculty.evansville.edu/de3/b10802/PPoint/Pseudocoelomates/sld001.htm
http://www.savalli.us/BIO385/Diversity/13.Nematoda.html
http://en.wikipedia.org/wiki/Nematode
http://en.wikipedia.org/wiki/Rotifer
http://en.wikipedia.org/wiki/Acanthocephala