(from the article `beardworm`) ...Lamellibrachia barhami is one of the largest species. The body consists of three segments: two small anterior regions are called protosome and ... Found on http://www.britannica.com/eb/a-z/m/79
Portion of the body anterior to the major point of body flexion in may copepods; usually includes cepahlothorax and several free thoracic segments. Found on http://www.encyclo.co.uk/visitor-contributions.php
Met'a·some noun [ Prefix meta- + -some body.] (Zoology) One of the component segments of the body of an animal. Found on http://www.encyclo.co.uk/webster/M/57