What is a simple way for determining if an annelid is a member of Errantia (a polychaete)or Sedentaria (a clitellate)?
A)The number of segments
B)Possession of a closed circulatory system
C)The amount of chaetae (setae)
D)The layout of the digestive system

Question

Quizplus · Accepted Answer

The amount of chaetae (setae) is a distinguishing feature between Errantia and Sedentaria. Errantia have numerous chaetae that are often arranged in bundles on parapodia, while Sedentaria have reduced chaetae or lack them entirely.

What Is a Simple Way for Determining If an Annelid