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===Example of a Protozoal Life Cycle===
 
===Example of a Protozoal Life Cycle===
[[Image:Coccidia.jpg|thumb|right|150px|Coccidia - Joel Mills]]
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See [[Coccidia]]
''The following refers specifically to the life cycle of Coccidia spp.''
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*The '''oocyst''' is the resistant stage in the environment
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*The infective '''sporozoite''' is released from the oocyst
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*Inside the host, the sporozoites invade the intestinal epithelial tissue
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**Sporozoites feed and grow
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*As the sporozoite grows the nucleus divides forming a '''schizont'''
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*The schizont contains numerous elongated '''merozoites'''
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*The formation of merozoites is the first asexual reproductive stage called '''schizogony'''
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*The schizont ruptures releasing the merozoites which also invade the epithelial cells
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*Another generation of schizonts form which is the beginning of the sexual phase of reproduction called '''gametogony'''
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*The merozoites form male '''microgamonts''' or female '''macrogamonts'''
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**Collectively known as gamonts or gametocytes
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*The microgamonts released from the microgametocyte penetrate and fertilise the macrogamont (which is contained within the macrogametocyte)
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*Gametogony forms the '''zygote'''
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**Surrounded by a cyst wall
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**Forms the '''oocyst'''
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*The oocyst is passed in the faeces and is unsporulated
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*The oocyst becomes sporulated in the second asexual reproductive phase called '''sporogony'''
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*Once the oocyst is sporulated it is infective
      
==Protozoa of Veterinary Importance==
 
==Protozoa of Veterinary Importance==
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