Worm parasites, such as the flatworms (flukes and tapeworms) and roundworms (hookworms and lungworms).
Flatworms of the class Trematoda that, at maturity, are internal parasites of vertebrate animals and humans, but in snails usually have intermediate stages. The mature worms are usually seed-shaped and found in the liver, alimentary canal, and other body cavities, attached usually by two suckers.
A parasite that attacks the outside of an animal’s body.
Weight of a liquid as compared with distilled water.
Life history; the changes in the form of life that an organism goes through.
Any of various blood-sucking arachnids, which fasten themselves to warm-blooded animals. Some are important vectors of diseases.
The larval or maggot stage of the bot fly or nit fly that migrates from the tongue or mouth to the stomach of horses, or from the nostrils to the sinus cavities of sheep, goats, and deer, where they may grow to be over ½ inch long; hard to control.
Parasites in humans, animals, and plants, which may cause disease and great economic loss. They vary in size from a fraction of an inch in length and as thin as a silk thread to over a foot in length and as thick as a pencil. In people and animals, they inhabit the intestine, but in completing a complex life cycle may infest the blood stream, lungs, windpipe, liver kidneys, etc. Symptoms vary but in general are those of unthriftiness.
Any unsegmented worm of the phylum Nematoda, having an elongated, cylindrical body; a roundworm.
A parasitic intestinal worn of a flattened, tape-like form, order Cestoda, composed of separate parts or segments.
Often called cattle grubs; Hypoderma lineatum; the larvae can open a hole through the skin on the back of the animal.
The close association of two dissimilar organisms, each known as symbiont. The associations may have five different characterizations as follows: mutualism: beneficial to both species; commensalism: beneficial to one but with no influence on the other; parasitism: beneficial to one and harmful to the other.