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| − | ==''Linguatula serrata''==
| + | [[Linguatula serrata|''Linguatula serrata'']] |
| − | [[Image:Linguatula taenioides.jpg|right|thumb|150px|Copyright Cooper Curtice (Washington, Government Printing Office, 1890) Wikimedia Commons]]
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| − | *Also known as the tongue worm
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| − | *A highly specialised [[Arthropods|arthropod]]
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| − | '''Recognition'''
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| − | *[[Oral Cavity - Tongue - Anatomy & Physiology|Tongue]]-like appearance
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| − | **Expanded anteriorly
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| − | *Adults are over 10cm in length
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| − | **Females measure between 30-130mm in length
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| − | **Males measure up to 20mm in length
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| − | *Transversely striated
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| − | '''Life cycle'''
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| − | *Life cycle takes '''6 months'''
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| − | *Adults inhabit the [[Nasal cavity - Anatomy & Physiology|nasal passages]] of dogs and sometimes cats
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| − | *Eggs are expelled by coughing and sneezing or are passed out with the faeces
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| − | *Herbivorous intermediate hosts ingest the eggs
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| − | *Eggs hatch in the herbivore [[Small Intestine - Anatomy & Physiology|intestine]]
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| − | *Larvae migrate to the [[Peritoneal cavity - Anatomy & Physiology#Mesenteries|mesenteric lymph nodes]] and encyst to become infective nymphs
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| − | **Cysts measure 1mm in diameter
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| − | *When a dog eats infected uncooked viscera the life cycle is completed
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| − | *Infective nymphs migrate from the viscera during chewing and crawl up into the [[Nasal cavity - Anatomy & Physiology|nasal cavity]] via the [[Soft Palate - Anatomy & Physiology|soft palate]]
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| − | *Infective nymphs mature to adults in the [[Nasal cavity - Anatomy & Physiology|nasal cavities]] and can survive for a year in the final host
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| − | '''Pathogenesis'''
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| − | *Causes [[Nasal Cavity Inflammatory - Pathology#Infectious causes of rhinitis|rhinitis]]
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| − | *Heavy infection leads to coughing, sneezing and nasal discharge
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| | ==Sea Lice== | | ==Sea Lice== |