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30 Cards in this Set
- Front
- Back
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Do Cestodes generally have a direct or indirect life cycle?
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Indirect- they require one or more intermediate hosts
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How do Cestodes receive nutrients?
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They hold on to host tissue with their scolex and absorb nutrients across their integument.
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What is a strobila?
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The body of a tapeworm or Cestode
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What is a proglottid?
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A mature segment of a Cestode
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What are the two orders of Cestodes?
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Pseudophyllidea- primitive
Cyclophyllidea |
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What are the differences between psuedophyllidea and cyclophyllidea?
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Psuedo- 2 or more IH, bothria, Genital pore medial, opperculate eggs, multiple larval stages
Cyclo-1 IH, sucker &/or hooks,genital pore lateral, eggs not opperculate, diverse larval types |
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What are the Hosts of Diphyllobothrium latum?
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DH- fish-eating mammals
IH copepods and fish PH bigger fish |
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What is the infective stage of Diphyllobothrium latum for the DH?
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Pleurocercoid in fish
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Pathogenesis for Dipyllobothrium latum?
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usually subclinical but can compete with host for vitamin B12 and can cause abdominal discomfort, diarrhea, nausea weakness
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What are the host for Spirometra mansonoides?
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DH: cats, wild cats esp. bobcat
IH Copepods, and vertebrates not fish |
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What stage of S. mansonoides is ingested by a copepod?
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coracidium
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Pathogenesis of S. mansonoides
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adults non-pathogenic
Sparganosis- aberrant host ingests procercoid which migrates from the gut to become a plerocercoid |
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Cyclophyllidean eggs contain what kind of embryo?
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hexicanth aka oncosphere
with 3 pairs of hooks |
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Cysticercus
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fluid-filled bladder with one protoscolex
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strobilocercus
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bladder with strobilization and one protoscolex
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coenurus
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fluid-filled bladder containing several protoscolices
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Unilocular Hydatid Cyst
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thick walled, endogenous budding, hydatid sand= multiple protoscolices
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multilocular hydatid cyst
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exogenous budding= multiple protoscolices, agressivley fast growing
looks like grapes |
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Cysticercoid
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dense solid structure, single protoscolex found in arthropod IH
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What are the hosts of Anoplocephala and Paranoplocephala?
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DH equines
IH orbatid mites |
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Where is Anoplocephala perfolata found in the DH as opposed to A. magna and P. mamilana?
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A. perfolata- cecum
A.magna and P. mamilana- Small intestine |
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Do the tapeworms of horses have hooks on their rostella?
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no they have esp. muscular suckers only
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Pathogenesis of A. perfoliata?
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adults interfere with illeocecal valve and can cause: persistent diarrhea, intussusception, and colic
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Host of Monieza?
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DH: ruminants
IH: orbatid mites |
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Does Monieza have very much clinical significance?
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no
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Hosts of Thysanosoma actinoides
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DH sheep, goats, wild ruminants
IH: booklice or barklice |
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What is the geographic distribution of T. actinoides?
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western US esp mountains
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what is unique about T. actinodies eggs and proglottids?
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eggs- no pyraform apparatus
proglottids- fringed |
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What is one of the most common tapeworms of humans?
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Hymenolepis nana
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What are the host of Hymenolepis species?
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DH: rodents and humans
IH: flour beetles, fleas, other insects |
