01 October 1999

How did metamerism take place?

Whole organism --longitudinal budding without separation of individuals. example of acoelomate worm.
Larval stage --trochophore larvae (top-like larvae)

Arthropods

• segmented bodies
• hard outer body covering (exoskeleton)--chitin
• biramous appendages
• haemocoel
• ventral nerve cord
• tagmata (regional fusion of segments)