Lab 6: Annelida Flashcards
Define “true coelom”
an internal fluid-filled body cavity completely lined by tissue derived from mesoderm
What are animals in the phylum annelida commonly called?
segmented worms
What clade do Annelida belong to?
spiralia
Define “septum”
the wall that allows internal separation from the other segments
T/F: there is an individual coelom in each segment of the worm
True
What are the bristles on Annelida called?
Chatae
How many pairs of bristles do earthworms have on each side of a segment?
2
What type of nervous system do Annelids have?
Central nervous system
What provides precise control of each segment of an annelid?
The segmental ganglion; composed of a concentration of nerve cells that send signals to the muscles and organs within each segment
Does an annelid have antagonistic muscles?
Yes
How do annelids achieve a hydrostatic skeleton?
they combine segmentation and the coelom
Does an annelid have a circulatory system?
Yes; composed of two large vessels on the dorsal side and one on the ventral side
Does an annelid have ay specialized gas structure?
No; gas exchange occurs across the surface of its body.
What is a deposit feeder?
feeding strategy that includes ingesting soil, chemically digest the organic material and absorb it, then let the indigestible parts of the soil pass through
What are an annelids feeding strategy?
suspension feeding, parasitism, predation, scavenging, eat dead plant material
What kind of digestive tract does an annelid have?
Complete
What is the excretory organ in annelids?
The nephridium
What form of nitrogenous waste does the annelid have?
Urea
What is the body fluid in an annelid?
coelomic fluid
