Distinguish between the following
(a) Prostomium and peristomium
(b) Septal nephridium and pharyngeal nephridium
(a)
|
Prostomium |
Peristomium |
|
Prostomium is a small fleshy lobe, which overhangs the mouth of an earthworm. It helps the organism push into the soil and is sensory in function. |
The first body segment in the earthworm is called the peristomium. It surrounds the mouth opening. |
(b)
|
Septal nephridium |
Pharyngeal nephridium |
|
They are present on both sides of inter-segmental septa behind the 15thsegment and they open into the intestine. |
They are present as three paired tufts in the fourth, fifth, and sixth segments. |
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