THE PSEUDOCOELOMATE BODY PLAN
Pseudocoelomates (aschelminths) - 7 phyla [Fig. 20.3]
- coelom: tube within a tube; body cavity.
- Learn about pseudocoelomates from the University of
California Museum of Paleontology website
- body cavity between mesoderm and endoderm [fig 16.11b]
- hydrostatic skeleton, complete digestive tract in most, etc.
- eutely: Caenorhabditis elegans [Box 20.1] . The Riddle lab presents
a good introduction to this species of roundworm.
PHYLUM ROTIFERA: 2,000 spp.
Learn more about rotifers
from Wim von Egmond.
Or look at and learn about rotifers
from Central Texas from Jerry Evans
- Characteristics [Fig. 20.4]
- parthenogenesis [Fig. 20.5]
PHYLUM NEMATODA - roundworms
- 16,000 named species - 500,000 possible species
Learn about roundworms from the University of Michigan Museum
of Zoology website.
This site from Jim McCarter has
links to everything you could ever possibly want to know about roundworms.
- free living
- Anguillula: the vinegar eel
Caenorhabditis: a soil nematode
- Ascaris lumbricoides: giant intestinal roundworm [Fig. 20.10]
- Enterobius [Fig. 20.11]: pinworms
- Necator [Fig. 20.12]: hookworms
- Tricinella [Fig. 20.13]: trichinosis
- Wuchereria: filarial worms [Fig. 20.14-20.15]