Complex Life Cycles in Heterophyid Trematodes: Structural and Developmental Design in the Ascocotyle Complex of Species

Download PDFDownload Complex Life Cycles in Heterophyid Trematodes: Structural and Developmental Design in the Ascocotyle Complex of Species PDF

Presented at the Fourth International Conference on Creationism Pittsburgh, PA, August 3-8, 1998

© Copyright 1998 by Creation Science Fellowship, Inc., Pittsburgh, PA USA – All Rights Reserved

Abstract

Microscopic heterophyid trematode parasitic worms of the Genus Ascocotyle infect certain amnicolid and hydrobiid snails and certain cyprinodont and poeciliid estuarine fishes as first and second intermediate hosts. Adult trematode worms are found to mature in the intestines of particular definitive hosts, most often piscivorous birds, but also certain mammals. A survey of these parasites, harvested from fish hearts and gills collected in Mississippi, Texas and California, shows that they are obligated to complex life cycles requiring at least three disparate and different hosts to achieve fecundity. Methods of infection, host infection site and host specificity are often unique to each different species of these parasites. Additionally, Ascocotyle worms demonstrate highly specialized structures such as HCl resistant cysts, HCl sensitive penetration glands and sensory organs which may serve to guide them to the specific infection site. These heteroecious life cycles and specialized structures are shown to be too complex to have developed by chance, therefore, evolutionary mechanisms appear insufficient to explain them. A creationist design argument for the presence of such parasites is promulgated.

Keywords

Trematode, obligate parasite, intermediate host, cercaria, metacercaria, life cycles, design, chance.

For Full Text

Please see the Download PDF link above for the entire article.

The Latest
NEWS
A Little Book with a Big Plan
Are you tired of reading dinosaur books to your kids while trying to filter the evolutionary worldview? ICR just published a new children’s book...

NEWS
Bees Are Actually Really, Really Smart
“These are, high, high, highly intelligent creatures,” said conservation biologist Reese Halter.1   Halter was speaking of the fascinating...

TESTIMONIALS
A Firm Foundation
Hello, I’m Don Barber, Director of Enterprise Technology at ICR. After serving here in a variety of roles for many years, I’m so glad to...

NEWS
Data Leads to Correct Post-Flood Boundary
For decades, creation scientists have debated the level at which the Flood ended in the rock record. In the past, many have based their conclusions...

NEWS
More Problems with Iconic Milankovitch Paper
Secular scientists have a difficult time explaining an Ice Age, even though there is strong geological evidence that one occurred. In fact, creation...