Department of Zoology at ANDC/Zoology Museum/Permanent slides/Echinodermata

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{|cellpadding="5" cellspacing="6" style="width:100%;background:#FFFFFF; border-style:solid; border-width:3px; border-color:#0066FF;" Date & Time : 28, August 2024      
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= Pedicellaria of Star fish  =
 * They are modified spine like structures, scattered all over the body.


 * Types : two types,straight type and crossed type.


 * Composition : consists of basillar plates and two valves.


 * Valves : movably articluated with basilar piece.


 * Muscles : adductor(2 pair) and abductor(1 pair) muscles present.


 * Function : Offence and defence.

= Bipinnaria larva =


 * characteristic free swimming larva of Asteroidea.


 * Developmental changes : develops three lateral lobes on each side within 2-7 days.


 * Anterior end : consists of dorso-median arm,ventro-median arm and pre-oral arms.


 * Lateral sides : consists of antero-dorsal arms,postero-dorsal arms,post-oral arms and postero-lateral arms.


 * Alimentary canal : has mouth,oesophagus,stomach,intestine and anus.