Distinguish between the following

(a) Prostomium and peristomium

(b) Septal nephridium and pharyngeal nephridium

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Solution

(a)

$\begin{matrix} P r o s t o m i u m & P e r i s t o m i u m P r o s t o m i u m i s a s m a l l f l e s h y l o b e, w h i c h & T h e f i r s t b o d y s e g m e n t i n t h e o v e r h a n g s t h e m o u t h o f a n e a r t h w o r m . i t & e a r t h w o r m i s c a l l e d t h e h e l p s t h e o r g a n i s m p u s h i n t o t h e s o i l a n d i s & p e r i s t o m i u m . I t s u r r o u n d s t h e s e n s o r y i n f u n c t i o n . & m o u t h o p e n i n g . \end{matrix}$

(b)

$\begin{matrix} S e p t a l n e p h r i d i u m & P h a r y n g e a l n e p h r i d i u m T h e y a r e p r e s e n t o n b o t h s i d e s o f & T h e y a r e p r e s e n t a s t h r e e p a i r e d i n t e r s e g m e n t a l s e p t a o f s e g m e n t 15 t o t h e l a s t & t u f t s i n t h e f o u r t h, f i f t h, a n d s i x t h s e g m e n t . T h e y o p e n i n t o t h e i n t e s t i n e s . & s e g m e n t s . \end{matrix}$

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