Parasitology Exam Ii Platyhelminthes

Front 1

modular iteration

Back 1

the process involved in forming a tapeworm strobila

Front 2

proglottid

Back 2

the so-called ‘segment’ in a tapeworm’s strobila

Front 3

protonephridium

Back 3

the unit of structure and function in the osmoregulatory system of the Platyhelminthes

Front 4

distome

Back 4

the body form of a digenean with two suckers, one anteriorly (the oral sucker), and another located mid-ventrally (the ventral sucker or acetabulum)

Front 5

acetabulum

Back 5

another name for the ventral sucker on a digenean; it is a holdfast only

Front 6

amphistome

Back 6

the body form of a digenean in which the acetabulum is situated at the posterior end

Front 7

monostome

Back 7

the body form of a digenean in which there is only an oral sucker; the acetabulum is absent

Front 8

gasterostome

Back 8

the body form of a digenean in which the oral sucker is located toward the mid-ventral area and the acetabulum is absent

Front 9

holostome

Back 9

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

Front 10

syncytial

Back 10

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

Front 11

cyton

Back 11

the body of the syncytial tegument of parasitic flatworms containing the nuclei and other organelles

Front 12

parenchyma

Back 12

mass of mesenchymal cells filling spaces between the organ systems, muscles, or epithelia

Front 13

miracidium

Back 13

the ciliated, free-swimming larval stage of a digenean that emerges from an egg

Front 14

polyembryony

Back 14

the formation of two or more ‘embryos’ from a single zygote

Front 15

sporocyst

Back 15

an intramolluscan, asexual developmental stage of digeneans

Front 16

redia

Back 16

an intramolluscan developmental stage produced by a digenean sporocyst

Front 17

cercaria

Back 17

an immature digenean, usually free swimming, produced by a sporocyst or a redia

Front 18

metacercaria

Back 18

a developmental stage of digeneans between a cercaria and an adult; usually sequestered within a cyst in a second intermediate host

Front 19

paratenic host

Back 19

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