Image of Mussel worm

Description:

Most of the setae are compound (composed of more than one segment). Closer examination by compound microscope would show this to be a homogomph falcigerous seta. A falciger is a seta in which the tip is comparatively blunt and curved. A homogomph seta is a compound seta in which the basal segment ends in a slightly expanded capsule, the two sides of which are of approximately equal height (as opposed to heterogomph, in which one side of the capsule is extended well out past the other).