1. Mollusks Emily Yau and Bridget Waas

2.  Mollusks are tripoblastic: they have three germ layers  Endoderm, ectoderm, and mesoderm Germ Layers

3.  Most of mollusks are bilaterally symmetrical Symmetry

4.  Mollusks are coelomates, and have a true coelom  Most coeloms are small and located around the heart, gonads, and metanephridia (organ similar to the kidneys) Coelom

5.  All mollusks have a complete digestive tract  Mouth, stomach, and anus  Tube-like Digestive Tract

6.  Evidence of cephalization increases from chitons to cephalopods Cephalization

7.  None! Segmentation

8.  Most mollusks have a hydrostatic skeleton or an exoskeleton  The number of appendages change from species to species Skeleton and Appendages

9.  A mollusk’s circulatory system is mainly open  No true heart or capillaries Circulatory System

10.  Most mollusks have one gill or one pair of gills  Some land mollusks have lungs Respiratory System

11.  Assexual or sexual, depending on the species Reproduction

12.  Mollusks are found everywhere, but most live in marine environments Habitat