Coelomic cavities may function as a vascular system in amphioxus larvae.

The Biological Bulletin | December 1, 1998| | Copyright

When amphioxus larvae begin to feed in the plankton (8), the extracellular matrices (ecm) of certain areas of the body are widely expanded ([ILLUSTRATION FOR FIGURE 1A OMITTED]; methods: (20)). This is particularly evident in those areas where, in adult specimens, major blood vessels will be situated. Fully developed blood vessels in adults are typically enlarged, fluid-filled spaces within the extracellular matrix (6). In one observation, a rudimentary blood vessel could be demonstrated by electron microscopy in the expanded ecm space below the notochord of a larva with one ...

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