| |
| | Tridachia Laboratory Exercise (Site not responding. Last check: 2007-10-09) |
 | | The typical mollusc has a calcareous shell, muscular foot, head with mouth and sense organs, and a visceral mass containing most of the gut, the heart, gonads, and kidney. |
 | | The eumolluscan gut has digestive ceca which are lacking in aplacophorans, the gut is coiled, and a complex radular musculature is present. |
 | | The mantle cavity is posterior in the ancestor although it may be secondarily moved to an anterior position by torsion. |
| www.lander.edu /rsfox/310tridachiaLab.html (2660 words) |
|