Cestodes (tapeworms 1) Flashcards
cestodes taxonomy
kingdom- Animalia (unikonts)
Group- helminths
phylum- Platyhelminthes
class- cestodes (tapeworms)
cestodes alt name
tapeworms
cestodes host
- vertebrates final host
- utilize intermediate hosts
cestodes digeston
- no mouth or gut, abs all nutrients through tegument (syncytium covering body)
cestodes segmentation
yes segmented body
cestodes sex organs
- hermaphroditic
cestodes main body features
- Holdfast – Anterior end used to attach and move along intestinal wall
- Scolex – Head area
cestodes body and repro
- Neck – Germinal area behind scolex serving as source of growth for new segments
- Proglottids/ Stobila – Segments where immature right behind neck, mature behind immature, gravid after mating behind mature and containing eggs
- Segments can either routinely release eggs into feces or individual segments detach and passed in feces before releasing eggs
cestode transmission intermediate host
Intermediate infected by eating egg or ciliated larvae from egg
cestode transmission final host
- Final host infected by eating larva (meta-cestode) in intermediate host
- Eggs or segments passed in feces of final host
cestode organ effected
adults live in si
cestode dx
- larva are dangerous form
- adults typically minimally pathogenicity
cestodes life cycle 101
Egg in feces -> Egg or coracidium eaten by inter-mediate host -> Meta-cestode is final stage in inter-mediate host & disease causing stage -> Final hosts eats inter-mediate & thus also ingests meta-cestode -> Becomes strobilate tapeworm in final host intestines
diphyllobothriidea taxonomy
kingdom- Animalia (unikonts)
phylum- Platyhelminthes
class- Cestoda
family- Diphyllobothriidae
diphyllobothriidea host
- 1st intermediate host is freshwater copepod
- 2nd is vertebrate
- use paratenic host
diphyllobothriidea lifecycle
Trematode like eggs w/ operculum on top
- Coracidium – Product of embryon-ation (egg in water then develops into this w/ 6 hooklets inside)
- Procircoid – In swimming invertebrates that eat the coracidium
- Plerocircoid – Stage in next host (meta-cestode in this case)
diphyllobothriidea transmission
- aquatic
- eggs not infectious when passed
dibothriocephalus latus taxonomy
kingdom- Animalia (unikonts)
phylum- Platyhelminthes
class- Cestoda
family- Diphyllobothriidae
dibothriocephalus latus host
- intermediate is fresh water copepod
- final is fish eating mammals (bears, dogs, cats)
dibothriocephalus latus transmission
- ingestion of fish
- use paratenic host in bigger and bigger fish to move up food chain
dibothriocephalus latus dx
- usually no clinical signs
- 50% patients have digestive disturbances
spirometra spp. taxonomy
kingdom- Animalia (unikonts) phylum- Platyhelminthes class- Cestoda family- Diphyllobothriidae genus- spirometra
spirometra spp. host
- intermediate are first copepods then string of paratenic like mice
- final= bobcats and other wild felids
spirometra spp. id
Metacestode Spargana – Mature larvae that have heads like the adults similar to plerocircoid in vertebrate final host
spirometra spp. lifecycle
- Procercoid in copepod
spirometra spp. transmission
- Ingestion of vertebrate intermediate host
- In amphibians, reptiles, warm blooded vertebrates and moves up food chain until back in vertebrates
spirometra mansonoides taxonomy
kingdom- Animalia (unikonts) phylum- Platyhelminthes class- Cestoda family- Diphyllobothriidae genus- spirometra
spirometra mansonoides host
- intermediate copepod
- paratenic amphibian then rat
- final = bobcat
spirometra mansonoides lifecycle
- egg -> coracidium
spirometra mansonoides id
- eggs look like those of trematodes
spirometra mansonoides organ infected
- skin, CT
cyclophillidea taxonomy
kingdom- Animalia (unikonts)
phylum- Platyhelminthes
class- Cestoda
order- Cyclophyllidea
cyclophillidea host
- usually one intermediate host of insects (fleas, lice, mites ect)
- can use paratenesis
cyclophillidea lifecycle
Non-trematode like eggs
- Come out already embryonated & have 6 hooklets inside to tear through intestines of 1st intermediate host
- Cysticercoid – Stage that uses invertebrates
- Meta-cestode Cysticercus - larva develops adult head while in insect and head in fluid filled cyst (bladder)
- Meta-cestode Coenurus – Asexual multiplication in cyst of larva
cyclophillidea transmission
terrestrial
- usually pass segments full of eggs
- eggs infectious when passed
mesocestoides spp.
kingdom- Animalia (unikonts) phylum- Platyhelminthes class- Cestoda order- Cyclophyllidea family- Mesocestoididae
mesocestoides spp. host
- 1st intermediate unk (possible ants)
- 2nd is wildlife vertebrate (amphibian, reptile, bird, mammal)
- final = dogs, cats, raccoons, opossums
mesocestoides spp. lifecycle
- Egg in parauterine organ
- Tetra-thyridium – Metacestode larval stage w/ 4 suckers & no hooks on holdfast in 2nd intermediate
- Larva can undergo crazy asexual multiplication
mesocestoides spp. organ effected
abd cavity
mesocestoides spp. fun fact
- can actually see them in abd fluid
dipylidium caninum alt name
flea tapeworm
dipylidium caninum taxonomy
kingdom- Animalia (unikonts) phylum- Platyhelminthes class- Cestoda order- Cyclophyllidea family- Dipylidiidae
dipylidium caninum host
- intermediate flea
- final dogs and cats
dipylidium caninum lifecycle/ id
- grows to metacestode cysticercoid stage in flea
dipylidium caninum transmission
- ingestion of infected flea
- segments crawl out of anus to disperse eggs
anoplocephalids taxonomy
kingdom- Animalia (unikonts) phylum- Platyhelminthes class- Cestoda order- Cyclophyllidea family- Anoplocephalids
anoplocephalids host
herbivores
anoplocephalids life cycle
eggs shed in feces
anoplocephalids transmission
via ingestion of free-living arthropod containing cysticercoid metacestode
anoplocephalids pathogenicity
typically non-pathogenic
moniezia expansa taxonomy
kingdom- Animalia (unikonts) phylum- Platyhelminthes class- Cestoda order- Cyclophyllidea family- Anoplocephalids
moniezia expansa host
- intermediate free living mite
- final sheep
moniezia expansa transmission
via ingestion fo mite
moniezia benedeni taxonomy
kingdom- Animalia (unikonts) phylum- Platyhelminthes class- Cestoda order- Cyclophyllidea family- Anoplocephalids
moniezia benedeni host
- intermediate free living mite
- final cattle
moniezia benedeni transmission
- via ingestion of mite
anoplocephala magna taxonomy
kingdom- Animalia (unikonts) phylum- Platyhelminthes class- Cestoda order- Cyclophyllidea family- Anoplocephalids
anoplocephala magna host
final horses
anoplocephala magna lifecycle
cysticercoid metacestode in mite
anoplocephala magna transmnission
via ingestion of orbited mite
anoplocephala magna organ effected
jejunum
anoplocephala magna dx
hemorrhagic enteritis
anoplocephala magna geography
worldwide
anoplocephala perfoliata taxonomy
kingdom- Animalia (unikonts) phylum- Platyhelminthes class- Cestoda order- Cyclophyllidea family- Anoplocephalids
anoplocephala perfoliata host
- final horses
anoplocephala perfoliata life cycle
cysticercoid metacestode in mite
anoplocephala perfoliata transmission
via ingestion of orbatid mite
anoplocephala perfoliata organ
ileo-cecal junction
anoplocephala perfoliata dx
intussusceptions
anoplocephala perfoliata location
world wide
paranaplocephala mamillana taxonomy
kingdom- Animalia (unikonts) phylum- Platyhelminthes class- Cestoda order- Cyclophyllidea family- Anoplocephalids
paranaplocephala mamillana host
- final horses
paranaplocephala mamillana life cycle
cysticercoid metacestode in mite
paranaplocephala mamillana transmission
via ingestion of orbited mite
paranaplocephala mamillana organ effected
duodenum
paranaplocephala mamillana location
worldwide
thysanosoma spp. taxonomy
kingdom- Animalia (unikonts) phylum- Platyhelminthes class- Cestoda order- Cyclophyllidea family- Anoplocephalids
thysanosoma spp. host
- intermediate booklice
- final sheep
thysanosoma spp. lifecycle
cysticercoid metacestode in booklice
thysanosoma spp. transmission
via ingestion of booklice
thysanosoma spp. organ effected
bile ducts
thysanosoma spp. location
Rocky Mountains