Find reliable reference information to help answer these QUESTIONS
about Lumbriculus regeneration:

1) In nature, what circumstances could suddenly cause a whole worm to break into two or more worm fragments?
2)
In newly regenerating head or tail segments, what organ systems must develop and eventually make functional connection with organ systems in the original segments?
3) How many new head segments usually regenerate in this species?
4) How could you determine which is the anterior end, and which is the posterior end, in a small worm fragment that has not yet regenerated new segments?



RELATED LINKS: 
Diagram of Lumbriculus regeneration
Experiments with Lumbriculus regeneration

Those Wonderful Worms


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