What is the difference between perichaetine and lumbricine????

 Perichaetine and lumbricine refers to the setal arrangement in the earthworm. Perichaetine means more than 8 setae i.e setae numerous and arranged equally around each segment, at least in mid- or hind-body  while as Lumbricine means 8 setae per segment usually in 4 pairs.