Annelids (Segmented Worms) Flashcards
1
Q
Annelid Apomorphies
A
Segmentation, Chaetae (bundles of chitinous “hair”) used mainly for traction
2
Q
Metamerism
A
Structural body plan where it is differentiated into series of segments
3
Q
Each segment contains…
A
Pair of nephridia (for excretion), Pair of coelomoducts (for reproduction), Pair of ganglia on dorsal nerve chord, pair of appendages
4
Q
Advantages of Metamerism
A
Large animal from simple plan, Enables simple/complex movement, Loss of parts not fatal, open for specialization
5
Q
Serial Homology
A
Specialization of appendages for different function even though they are derived from same body plan
6
Q
Tagmatization
A
Groups of similiar metameres (specialized for certain function, most often referred to describe distinguished head, body, tail)
