Since our last trip was to the beaches of Hawaii, I wanted to be a little more serious today. Today we visit the National Center for Infectious Disease . This is an excellent web site for learning about animal parasites and the diseases they cause, diseases that cause suffering to hundreds of millions of humans. I especially recommend the travel warning section. Please use this opportunity to learn about the disease called schistosomiasis.
Several features unite the protostomes in addition to their pattern of embryonic development.
They are all triploblastic and are all bilaterally symmetric. They vary in many other ways, however, and you will see they are quite diverse. They may be acoelomate, pseudocoelomate, or coelomate. They may be segmented or not. They may or may not be worms.