Small Animal Parasitology

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41 Cards. Created by Christopher Simmons ().
worms and such
 
Term  
Definition

Morphological structures of digenetic flukes?

  • attachment organs (oral sucker)
  • esophagus
  • blind ceca (hermaphroditism)
  • testes (tandem v parallel)
  • cirrus (penile structure)
  • vitelline glands
  • ovary
  • uterus
  • genital pore

What is the infective stage of most flukes?

metacercaria

Flukes commonly use what intermediate host?

snail

What is a schistosome?

  • Type of fluke which has a tubular body and separate sexes (dioecious)
  • Has no 2nd IH
  • Matures in blood of DH
  • Eggs have lateral spine

Two main types of cestodes?

pseudophyllidea and cyclophyllidea (true tapeworm)

Characteristics of cestodes?

  • Hermaphroditic
  • Endoparasites with indirect life cycle
  • Absorb nutrients through body wall
  • Variable sizes

Cysticercoid?

Single scolex NOT invaginated (usually an invertebrate IH)

Cysticercus?

Single invaginated scolex (usually vertebrate IH)

Hyatid Cyst?

Brood capsules with 100-1000 protoscolices. - may be unilocular or multilocular

Strobilocercus?

Single, non-invaginated scolex attached to fluid-filled bladder via segmented stobila

Characteristics of all nematodes?

  • tubular bodies with body cavity
  • separate sexes (dioecious)
  • may have direct or indirect life cycle
  • complete digestive system

Nematode life cycle? (generally)

  • egg/larvae --> L1-5 (L3 usually infective) --> larvaie in IH (if indirect) --> adults in DH

Characteristics of rhabditoidea (strongyloides)?

  • tiny worms (most free-living, some facultative)
  • only females are parasitic

Characteristics of trichostrongyloidea?

  • hairlike worms, tiny mouths
  • males have well-developed copulatory bursa
  • direct lifecycle
  • usually in GI tract
  • ostertagia and haemonchus are most common

Characteristics of Metastrongyloidea?

  • medium sized worms
  • lungs
  • indirect life cycle
  • males have 2 equal spicules

Characteristics of strongyloidea?

  • medium sized with large mouths
  • males have prominent copulatory bursa and 2 equal spicules
  • direct life cycle (often with extensive larvae migration)

Characteristics of oxyuroidea?

  • double-bulbed esophagus
  • female tail: drawn to extreme point
  • male tail: caudal alae, single spicule
  • ONLY PARASITE OF OMNIVORES OR HERBIVORES (NOT CARNIVORES)

Characteristics of ascaroidea?

  • very large (>6") with 3 robust anterior lips
  • direct life cycle with larval migration
  • males are without copulatory bursa
  • may or may not have alae
  • large egg with thick central morula

Characteristics of spiruroidea?

  • medium-sized worms with prominent mouth
  • sclerotized
  • indirect life cycle (arthopod IH)
  • males have caudal alae, 2 unequal spicules, and twisted posterior ends

Characteristics of trichuroidea? (whipworms)

  • short, fat posterior ends, long whip-like anterior end
  • beaded esophagus
  • males have no bursa and no alae
  • direct life cycle
  • "Stewie head" eggs