What research has changed something substantially?
Cladistic research
What has it changed?
the scheme
Since what year?
1997
What group are Annelids associated with?
Lophotrochozoa
Is that a type of protosome?
Yes
What kind?
"super-phylum"
Are annelids described as not being the same on each side?
No
What modifier is used to describe their symmetry?
Bilaterally
What group are leeches a sub-category of ?
Oligochaetes
What are they a sub-group of ?
Polychaetes
Do most books still classify these creatures into five categories?
No
How many then?
Three
What is used for motion in the creatures?
Parapodia
A single one?
No
What is responsible for the separation of segments?
Septa
Are they present in all of these creatures?
No
What does the blood circulate within?
Blood vessels
What can fulfill the role of the heart?
Muscles
What is the formal name for ripples?
Peristalsis
What sort of classification does the earthworm hold?
Oligochaetes