Sporocysts burst giving rise to rediae which give rise to tailed cercaria

Parasitic life cycle of a sheep liver fluke. (Illustration by Christina St. Clair)

ventral suckers to attach to their hosts. Members of the subclass Aspidogastrea have a large ventral disk that they use for adhesion. This disk is covered with many small suckers known as alveoli.

Ventral suckers are generally about the same size as the oral suckers, and located centrally on the anterior, ventral surface. Often, the ventral suckers are quite close behind the oral sucker. Trematodes generally have one or two large, sometimes branched, testes, a comparatively small ovary, an often long and looping uterus, and a single common genital pore. They typically have a bifurcated intestine and blind caeca that exit the body through an anus or via an excretory vesicle. The integument lacks a cuticle.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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