Nematodes Part II

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    Eggs, part of larvae and empty shell of Dictyocaulus arnfeldi. Lungworms of horses
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    • Dictyocaulus filaria
    • Lungworm of sheep, goats and deer
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    • Strongyloides papillosus
    • Intestinal threadworm of cattle, sheep and swine.
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    Metastrongylus apri - Lungworms of pigs
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    • Strongyloides stercoralis
    • Intestinal threadworm of dogs, foxes, cats and man
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    Found in
    Strongyloides larvae normally appear in freash feces of infected dogs - eggs are not usually seen.
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    Strongyloides stercoralis X400
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    • A = Strongyloides westeri
    • B = Strongyles sp. X100
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    Strongyloides westeri - eggs are embryonated when laid
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    • Strongyloides papillosus X100
    • "Intestinal threadworm" of cattle, sheep, goats and rabbits.
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    Strongyloides papillosus - eggs are embryonated when laid
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    • Spirocerca lupi
    • Esophageal worm of dogs and foxes
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    Spirocerca lupi eggs X400
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    Spirocerca nodules in the lumen of the esophagus. Adult worms are seen in the granulomous lesions.
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    Sarcoma in the esophagus due to Spirocerca sp.
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    Opened esophagus of a dog with 3 distinct nodules produced by Spirocerca sp.
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    • Spirocerca eggs
    • A= low power B= high power
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    Spirocerca lupi eggs containing fully formed larva. 
  19. What is the smallest embryonated ova seen in dog species?
    Spirocerca lupi
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    Parasite of the _________ but can be found in _________.
    • Pearsonema plica
    • Urinary bladder; feces
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    Pearsonema plica eggs X400
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    Found in
    • Dioctophyma renale
    • Giant worm of dogs, foxes and occasionally man
    • Found in urinary sediment; may be found in feces contaminated with urine
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    Eggs of Dioctophyma renale
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    Found in
    • Eggs of Stephanurus dentatus
    • Kidney worm of swine
    • Eggs are found in urinary sediment and occasionally in feces.
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    Eggs of Stephanurus dentatus X400
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    • Eggs of Physaloptera praeputialis
    • Stomach worm of cats, dogs, foxes and wild felidae.
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    Eggs of Physaloptera praeputialis X400
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    • Physaloptera rara
    • Stomach worm that contains an embryo when passed in the feces
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    • Eggs of Habronema muscae
    • Gastric nematode of horses
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    Habronema muscae
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    Eggs of Draschia megastoma. Eggs are from exudate in a gastric abscess, which contains adult worms.
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    • Draschia megastoma - horse
    • Seen are larvae in the feces
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    Chronic gastritis in a horse with numerous ulcers associated with Trichostrongylus axei
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    Inflammation and catarrhal (pus) in the stomach caused by Trichostrongylus axei
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    • Gasterophilus intestinalis in the stomach
    • Gasterophilus nasalis in the duodenum
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    Submandibular edema "bottle jaw" in cow with parasitic gastritis
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    • Eggs from Haemonchus sp
    • Stomach worm of cattle, goats and sheep
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    • Eggs of Haemonchus contortus
    • "Common or twisted" stomach worm of cattle, sheep and goats
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    Haemonchus sp worms on the mucosal surface. Female worms resemble a barber pole.
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    • Ascarops strongylina
    • Stomach worm of swine
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    Number of species
    • Strongyles sp eggs
    • Forty species have been reported from the large intestines of horse, asses and mules in North America.
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    • 2 diff Strongyles sp. eggs
    • Strongylus vulgaris (left)
    • Strongylus edentatus (right)
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    Found in
    • Eggs of Oxyuris equi
    • Rectal worm, Nocturnal worm and pinworm
    • Found in the feces, but exam of anal scraping is a more accurate method of diagnosis.
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    • Oxyuris equi
    • Single opeculated
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    Also called
    • Nematodirus spathigier - largest egg
    • Also called thread necked nematode of cattle, sheep and goats
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    Eggs of Nematodirus spathiger
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    • Eggs of Oesophagostomum sp.
    • Nodular worm of swine
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    Eggs of Oesophagostomum sp.
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    • Eggs of Macracanthorhynchus hirudinaceus
    • Cestode
    • Thorny-headed worm of swine
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    • Eggs of Macracanthorhynchus hirudinaceus
    • Embryo is surrounded by 3 shells
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    Eggs of Macracanthorhynchus hirudinaceus
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    • Dirofilaria immitis larvae (microfilaria) 
    • 1st stage of Heartworm infection in dogs, foxes, coyotes, wolves and cats
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    Dirofilaria immitis larvae in blood
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    Dirofilaria immitis. Larvae is straight because blood hemolyzed in 2% acetic acid.
  55. Lungworm of swine
    • Metastrongylus apri
    • Metastongylus salmi
    • Metastrongylus pudendodectus
    • Metastrongylus elongates
  56. Lungworm of horses
    Dictyocaulus arnfeldi
  57. Lungworm of sheep, goats, deer
    Dictyocaulus filaria
  58. Intestinal threadworm of cattle, sheep, swine, goats and rabbits
    Strongyloides papillosus
  59. Intestinal threadworm of dogs, foxes, cats and man
    Strongyloides stercoralis
  60. Intestinal threadworm of horses
    Strongyloides westeri
  61. Esophageal worm of dogs and foxes
    Spirocerca lupi
  62. Giant worm of dogs, foxes and occasionally man
    Dioctophyma renale
  63. Kidney worm of swine
    Stephanurus dentatus
  64. Stomach worm of cats, dogs, foxes and wild felidae
    Physaloptera praeputialis
  65. Gastric nematode of horses
    Habronema muscae
  66. 4 Stomach parasites of Ruminants
    • Haemonchus placei
    • Ostertagia ostertagi
    • Trichostrongylus axei
    • Haemonchus contortus
  67. "Common or twisted" stomach worm of cattle, sheep and goats
    Haemonchus contortus
  68. Stomach worm of swine
    • Ascarops strongylina
    • Hyostrongylus rubidus (red stomach worm)
    • Physocephalus sexalatus
  69. "Rectal worm" of horses
    Oxyuris equi
  70. Thread necked nematode of cattle, sheep, and goats
    Nematodirus spathiger
  71. Nodular worm of swine
    • Oesophagostomum dentatum
    • Oesophagastomum georgianum
    • Oesophagastomum brevicauderm

  72. Thorny-headed worm of swine
    Macracanthorhynchus hirudinaceus
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    Condition & location caused by what parasite
    Aneurysm of the cranial mesenteric artery from 4th stage larvae of Strongylus vulgaris
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    Condition and location of what parasite
    Hemorrhagic inflammation & necrosis of the cecum and ventral colon 2-3 weeks after infection with Strongylus vulgaris
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    Gastrophilus intestinalis on hairs of forelimb at the knee
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    Stage of parasite and route
    • 2nd stage of Gasterophilus intestinalis
    • Migration = hairs of the knee, then to the tongue, then to the stomach
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    Onchocerca cervicalis
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    Location and parasite
    Segments of ligamentum nuchae from lesions of Onchocerca cervicalis
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    Large lesions of Draschia megastoma in the stomach wall of a horse
  80. 2 parasites that cause tumors
    • Spirocerca lupi
    • Draschia megastoma
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    • Cutaneous habronemiasis
    • AKA summer sores - stomach worm
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    Trichostrongylus axei eggs
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    Thelazia lacrymalis (eyeworms) along the border of the nicitanation membrane.
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    Typical stance of piperazine toxicosis syndrome
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    • Helminth eggs - feces of cattle
    • Trichostrongylus axei
    • Trichuris ovis
    • Nematodirus spathiger
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    Calf with ostertagiasis with submandibular edema (bottle jaw/anasarca) caused by stomach worm that causes emaciation & diarrhea.
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    Marshallagia marshalli
Card Set
Nematodes Part II
Nematodes Part II