The comparative morphology of Marshallagia marshalli and Ostertagia occidentalis (Nematoda: Strongylida, Trichostrongylidae) by scanning electron microscopy View Full Text


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Article Info

DATE

2011-06

AUTHORS

Hassan Borji, Ahmad Reza Raji, Abol Ghasem Naghibi

ABSTRACT

The systematics of the Ostertagiinae is unsettled with no agreement on how many genera and species are present in cattle and sheep. Ten species of Ostertagiinae are commonly parasitic in cattle and sheep. In the global fauna, six of 13 ostertagiine genera are endemic to Iran. The life cycle of Ostertaginae is direct and ingested third-stage larvae after exsheatment in the rumen, penetrate the gastric glands in the abomasal mucosa where two parasitic moults occur before the L5 emerges from the gland. In the present work, Marshallagia marshalli and Ostertagia occidentalis, collected from the abomasums of sheep from Mashhad, Iran, is described. The association of light and scanning electron microscopy (SEM) allowed a detailed analysis of the morphology and ultrastructure of these nematodes. The male body length of M. marshalli and O. occidentalis were 9.3-10.20 and 9.60-10.50 mm, respectively. The female body length of M. marshalli and O. occidentalis were 10.10-15.30 and 10.4-15.70 mm, respectively. One of cervical papillae is seen 333 and 250 μm from the anterior end of male and female body surface in O. occidentalis and 287.5 and 200 μm from the anterior end of male and female body surface in M. marshalli, respectively. The size of cervical papillae is 13.3 μm in male and 10 μm in female in O. occidentalis and 9.33 μm in male and 8.57 μm in female in M. marshalli. Some other taxonomic features of M. marshalli and O. occidentalis, such as details of cephalic region, the system of longitudinal and surface cuticular ridges (synlophe), the orientation of rays of the copulatory bursa, localization of vulva, morphology of vulvar flap, and posterior end of females are also documented by SEM. More... »

PAGES

1391-1395

References to SciGraph publications

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  • 2004-03. Scanning electron microscopic observations on adult Spirocerca lupi (Nematoda: Spirurida, Thelaziidae) in PARASITOLOGY RESEARCH
  • 2007-03. Thelazia rhodesi (Spirurida, Thelaziidae), bovine eyeworm: morphological study by scanning electron microscopy in PARASITOLOGY RESEARCH
  • 2007-07. First description of the horse stomach worm, Habronema muscae (Spirurida: Habronematidae) by scanning electron microscopy in PARASITOLOGY RESEARCH
  • 2007-10. The comparative morphology of three equine habronematid nematodes: SEM observations in PARASITOLOGY RESEARCH
  • 2007-09. Equine stomach worm, Drashia megastoma (Spirurida: Habronematidae): first SEM report in PARASITOLOGY RESEARCH
  • 2011-02. Seasonal prevalence of gastrointestinal nematode parasites of sheep in Northern region of Nile Delta, Egypt in PARASITOLOGY RESEARCH
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    http://scigraph.springernature.com/pub.10.1007/s00436-010-2186-2

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    PUBMED

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    35 schema:description The systematics of the Ostertagiinae is unsettled with no agreement on how many genera and species are present in cattle and sheep. Ten species of Ostertagiinae are commonly parasitic in cattle and sheep. In the global fauna, six of 13 ostertagiine genera are endemic to Iran. The life cycle of Ostertaginae is direct and ingested third-stage larvae after exsheatment in the rumen, penetrate the gastric glands in the abomasal mucosa where two parasitic moults occur before the L5 emerges from the gland. In the present work, Marshallagia marshalli and Ostertagia occidentalis, collected from the abomasums of sheep from Mashhad, Iran, is described. The association of light and scanning electron microscopy (SEM) allowed a detailed analysis of the morphology and ultrastructure of these nematodes. The male body length of M. marshalli and O. occidentalis were 9.3-10.20 and 9.60-10.50 mm, respectively. The female body length of M. marshalli and O. occidentalis were 10.10-15.30 and 10.4-15.70 mm, respectively. One of cervical papillae is seen 333 and 250 μm from the anterior end of male and female body surface in O. occidentalis and 287.5 and 200 μm from the anterior end of male and female body surface in M. marshalli, respectively. The size of cervical papillae is 13.3 μm in male and 10 μm in female in O. occidentalis and 9.33 μm in male and 8.57 μm in female in M. marshalli. Some other taxonomic features of M. marshalli and O. occidentalis, such as details of cephalic region, the system of longitudinal and surface cuticular ridges (synlophe), the orientation of rays of the copulatory bursa, localization of vulva, morphology of vulvar flap, and posterior end of females are also documented by SEM.
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