Vocabulary Review Ch 34 – Flatworms, Roundworms, and Rotifers

In flatworms, the muscular tube that leads form the mouth to the gastrovascular cavity Pharynx

In a flatworm, a cell that has flagella or cilia that move waste products through the body Flame Cell

One of a pair of nerve- cell clusters that serve as a primitive brain at the anterior end of some invertebrates, such as annelids Cerebral ganglion

An organ that is covered by pigment in some invertebrates and protozoa and that detects changes in the quantity and quality of light Eyespot

A parasitic flatworm of the class Trematoda or Monogenea Fluke

On the external surface of a parasitic invertebrate, a layer that counters the defenses of the host’s body Tegument

The host from which an adult parasite gets its nourishment and in which reproduction occurs Primary Host

A host that gives food and shelter to immature stages of a parasite Intermediate Host

A disease that is caused by a parasitic blood fluke of the genus Schistosoma and that affects the skin, intestines, liver, vascular system, or other organs Schistosomiasis

The head of a tapeworm, which has hooks and suckers to adhere to the host tissues Scolex

A cavity or cell that contains embryos or bacteria in a resting stage Cyst

A member of the phylum Nematoda, which consists of animals that have smooth skin and a long, cylindrical, and unsegmented body that tapers at both ends Roundworm

A waxy or fatty and watertight layer on the external wall of epidermal cells Cuticle

A parasitic roundworm found in the intestines of mammals Hookworm

A disease that is caused by a parasitic roundworm of the genus Trichinella that results from eating the larvae in undercooked meat and that is characterized by diarrhea, fever, abdominal and muscle pain, and affliction of the lungs, nervous system, and heart Trichinosis

A nematode worm parasite that lives in the intestine of humans and animals; females lay their eggs around the anus, which causes itching Pinworm

One of a group of nematodes that cause diseases such as elephantiasis in humans and heartworm disease in dogs and cats Filarial Worm

A disease in humans that is caused by filarial worms and that is characterized by fluid accumulation that results in thickened skin around swollen extremities Elephantiasis

A member of the phylum Rotifera, which consists of small, aquatic invertebrates whose ring of cilia around the mouth makes the animal look like a spinning wheel Rotifer

The muscular pharynx in rotifers Mastax

In all vertebrates except mammals and reptiles, a chamber in the intestine that receives materials from the digestive, reproductive, and excretory systems Cloaca

A type of reproduction in which unfertilized eggs develop into adults Parthenogenesis