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30 Cards in this Set

  • Front
  • Back
classification scheme of Annelida
phylum annelida
class polychaeta (clamworms)
class oligochaeta (earthworms)
class hirudeinea (lichens)
metamerism
the body of annelids is divided into a series of segments or metameres. Externally this is exhibited by grooves which encircle the body, internally by septa or membranes which act as partitions
hydrostatic skeleton of coelomic fluid
coelomic fluid in annelids functions as a hydrostatic skeleton against which the muscles act to change body shape
cuticle
on the surface of an annelid there is a tough skin or cuticle with hard bristles
straight digestive tract
annelids posses a more or less straight digestive tract running from the mouth to the anus
closed cirrculatory system
annelids posses a well developed circulatory system in which the blood is confined to vessels
segmented nervous system
the annelid nervous system consists of the brain and two verntral nerve cords with a pair of ganglia in wach segment
prostomium
the first fleshy lobe of the head lying in front of the mouth it has numeroud sensory organs including the eyes and tentacles or antennae
eyes
light sensitive sensory organs on the prostomium
antennae (tentacles)
sense organs for touch and taste found on the prostomium
mouth
opening at the begininng of the digestive tract under the prostomium
parapodia
fleshy lobes for gas exchange extend from body segments
chaetae (setae)
bristles on the parapodia these are used for locomotion
anus
opening at the end of the digestive tract at the posterior end of the worm
cutivle
the skin covering the suface of the worm
somites
body segments plainly visible in annelids inside the body the segments are separated by membranes called septa
cirri
long bristles serving as organs of touch near the anus
pharynx
first part of the digestive tract leading from the mouth
esophagus
part of the digestive tract leading from the pharynx that opens into the intestines
esophageal caecum
secretes enzymes and increase surface area for digestion
stomach/intestine
structure where digestion and absorption takes place found following the esophagus
rectum
last part of the digestive tract which opens out of the anus
dorsal blood vessel
structure through which blood flows antertiorly found about the digestive tract
ventral blood vessel
structure through which blood flows posteriorly found beneath the digestive tract
lateral vessels
blood vessels which connect the dorsal and ventral vessels together, passing around the digestive tract
what serves the function of simple gills in the clamworm?
parapodia
dorsal ganglion
bilobed structure that coordinates nervous function. Found in the prostomium. "the brain"
ventral nerve cord
structure that carries nerve impules back and forth from the brain through the length of the worm.
nephridia
excretion is accomplished with these, tiny kidney units, there is a pair located in each segment of the clamworm
gonochoristic
there are both male and female worms, and they reprodice sexually