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19 Cards in this Set

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  • Back
modular iteration
the process involved in forming a tapeworm strobila
proglottid
the so-called ‘segment’ in a tapeworm’s strobila
protonephridium
the unit of structure and function in the osmoregulatory system of the Platyhelminthes
distome
the body form of a digenean with two suckers, one anteriorly (the oral sucker), and another located mid-ventrally (the ventral sucker or acetabulum)
acetabulum
another name for the ventral sucker on a digenean; it is a holdfast only
amphistome
the body form of a digenean in which the acetabulum is situated at the posterior end
monostome
the body form of a digenean in which there is only an oral sucker; the acetabulum is absent
gasterostome
the body form of a digenean in which the oral sucker is located toward the mid-ventral area and the acetabulum is absent
holostome
the body form of a digenean which appears to be divided into two parts, a larger anterior region in which are located the suckers, and a smaller posterior region in which the genitals are located
syncytial
a single cell possessing many nuclei; the tegument of parasitic flatworms is said to be syncytial, with nuclei scattered in cytons extending below the surface of the tegument
cyton
the body of the syncytial tegument of parasitic flatworms containing the nuclei and other organelles
parenchyma
mass of mesenchymal cells filling spaces between the organ systems, muscles, or epithelia
miracidium
the ciliated, free-swimming larval stage of a digenean that emerges from an egg
polyembryony
the formation of two or more ‘embryos’ from a single zygote
sporocyst
an intramolluscan, asexual developmental stage of digeneans
redia
an intramolluscan developmental stage produced by a digenean sporocyst
cercaria
an immature digenean, usually free swimming, produced by a sporocyst or a redia
metacercaria
a developmental stage of digeneans between a cercaria and an adult; usually sequestered within a cyst in a second intermediate host
paratenic host
a host in which development does not occur, but which may serve to bridge an ecological, or trophic, gap in a parasite’s life cycle