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MSU Parasitology Spring 2007
Definitions
39
Veterinary Medicine
Undergraduate 3
01/10/2007

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Term
Taxon; Taxonomy
Definition
Taxon: a group of organisms placed together because of their features in common..................Taxonomy: the study of this aspect of biology.
Term
7 Taxons in order
Definition
Kingdom, Phylum, Class, Order, Family, Genus, Species...............................
[King Philip Could Only Find Green Socks]
Term
Prepatent Period
Definition
The time taken for development from infection until mature adult parasites are producing eggs or larvae.
Term
Hypobiosis
Definition
The parasite makes itself sexually immature within the host until more favorable conditions are reached; usually seen as a seasonal arrest. Improves the chances for the progeny.
Term
Periparturient Egg Rise
Definition
When an animal has a higher serum prolactin level during pregnancy, parasitic immunity decreases. Therefore, larger numbers of eggs are found in the feces.
Term
Definitive Host; Final Host
Definition
The host in which sexual reproduction of the adult parasites will take place (production of offspring).
Term
Intermediate Host
Definition
"Biological Vector"; a temporary host that provides partial development of the parasite. Still needs another host to achieve maturity. Required for completion of lifecycle.
Term
Paratenic Host
Definition
A temporary host that keeps the immature from of the parasite alive- no development occurs within this host.
Term
Infective Stage
Definition
Stage of development in which the parasite can infect the host.
Term
Predilection Site (adult)
Definition
The location within a definitive host's body where the adult parasites will live.
Term
Larval Predilaction Site
Definition
Location within a host's body where immature forms of the parasite may migrate or develop.
Term
Mechanical Vector
Definition
A living creature that physically transports something potentially infective from point A to point B. Example- a fly landing on feces, then landing on a sandwich.
Term
Facultative
Definition
"Opportunistic"; When an organism (arthropod) takes advantage of an opportunity that arises, but does not require it to complete its life cycle.
Term
Obligate
Definition
"Required"; When an organism (arthropod) must use a specific host animal for the completion of a portion of its life cycle.
Term
Pasture Rotation
Definition
Rotating grazing animals off of land known to be infested with an organism that cannot live in winter, and moving the herd back in the spring (for example).
Term
Alternate Grazing
Definition
Parasite control within multiple herds of different species, when the definitive hosts cannot share the same parasites. Switching pastures infested with parasites keeps land from not being used and going to waste.
Term
Anthelmintic
Definition
Dewormer. Given to a host animal to rid it of a parasite.
Term
Parasite
Definition
An organism that lives on or in an organism of another species from the body of which it obtains nutrients.
Term
Cestode
Definition
Any of various parasitic flatworms of the class Cestoda, including the tapeworms, having a long flat body equipped with a specialized organ of attachment at one end.
Term
Larva
Definition
Newly hatched, wormlike, free-living, immature form of an organism, before it turns into an adult.
Term
Pesticide
Definition
A chemical preparation designed to destroy plant, animal, and fungal pests.
Term
Insect
Definition
Any animal of the class Insecta, comprising small, air-breathing arthropods having the body divided into three parts (head, thorax, and abdomen), and having three pairs of legs and usually two pairs of wings.
Term
Nymph
Definition
The immature form of those insects that do not pass through a pupal stage. They usually resemble the adults, but are smaller, lack fully developed wings, and are sexually immature.
Term
Nematode
Definition
Any of several worms of the phylum Nematoda, having unsegmented, cylindrical bodies, often narrowing at each end, and including parasitic forms such as the hookworm and pinworm. Also called roundworms.
Term
Operculum
Definition
a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted
Term
Helminth
Definition
A worm, especially a parasitic roundworm or tapeworm.
Term
Pupa
Definition
The nonfeeding stage between the larva and adult in the metamorphosis of insects, during which the larva typically undergoes complete transformation within a protective cocoon or hardened case.
Term
Metamorphosis
Definition
the marked and rapid transformation of a larva into an adult that occurs in some animals
Term
Arachnid
Definition
any wingless, carnivorous arthropod of the class Arachnida, including spiders, scorpions, mites, ticks, and daddy-longlegs, having a body divided into two parts, the cephalothorax and the abdomen, and having eight appendages and no antennae.
Term
Arthropod
Definition
any invertebrate of the phylum Arthropoda, having a segmented body, jointed limbs, and usually a chitinous shell that undergoes moltings, including the insects, spiders and other arachnids, crustaceans, and myriapods.
Term
Trematode; Fluke
Definition
Any of numerous flatworms of the class Trematoda, including both external and internal parasites of animal hosts, that have a thick outer cuticle and one or more suckers or hooks for attaching to host tissue.
Term
Protozoan
Definition
any of a diverse group of eukaryotes, of the kingdom Protista, that are primarily unicellular, existing singly or aggregating into colonies, are usually nonphotosynthetic, and are often classified further into phyla according to their capacity for and means of motility, as by pseudopods, flagella, or cilia.
Term
larval Instar
Definition
an insect in any one of its periods of postembryonic growth between molts.
Term
Biological Vector
Definition
An organism carrying disease causing microorganisms from one organism to another.
Term
Scours
Definition
Diarrhea in livestock
Term
Percutaneous
Definition
Passed, done, or effected through the skin.
Term
Melena
Definition
A condition marked by black, tarry stool or vomit composed largely of blood that has been acted on by gastric juices, resulting from a hemorrhage along the digestive tract.
Term
Bottle Jaw
Definition
a pendulous edematous condition of the tissues under the lower jaw in cattle and sheep resulting from infestation with bloodsucking gastrointestinal parasites (as of the genus Haemonchus)
Term
Cutaneous habronemiasis
Definition
A skin disease of horses caused in part by the larvae of stomach worms. When the larvae emerge from flies feeding on preexisting wounds or on moisture of the genitalia or eyes, they migrate into and irritate the tissue, which causes a granulomatous reaction.
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