Annelida Flashcards
characteristics
-bilateral symmetry
-segmented, non-tapering
-each segment has bristle (setca)
body plan
-body wall and digestive system with layers of muscle
-coelom, divided by digestive system
-complete digestive system
- closed circulatory system
-respiration via skin and gills
-organized nervous system -
-brain has ventral nerve cord
3 groups
leeches
polychetes
oligochetes
leeches
-posterior and anterior suckers for attachment
-anterior (oral) suckers –> pharynx to intestines
polychetes
-many setae
-gills
-primarily marine
oligochetes
-few bristles
-regular numbered segmentation
parts to know
external
internal
circulatory system
nervous system
reproductive
external
prostomium (nose)
mouth
clitellum
internal
coelom
septa
digestive tract
mouth
esophagus
crop
gizzard
circulatory system (closed)
5 hearts around esophagus
blood vessels- dorsal + ventral
nervous system
“brain”
ventral nerve cord
reproductive
testes + ovaries
hermaphroditic
caccoon
typhlosole- increases surface area
