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

{|cellpadding="5" cellspacing="5" style="width:100%;background:#CCCCFF; border-style:solid; border-width:3px; border-color:#013220;" {|width="100%" cellpadding="2" cellspacing="5" style="vertical-align:top;background-color:#66CDAA" !  Permanent slides of Porifera : ''Sycon
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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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=T.S. of Sycon =

Identifying Features

 * Body wall is diploblastic composed of pinacoderm and choanoderm with a middle layer of mesenchyme.


 * Pinacoderm is made of flat cells - pinaocytes.


 * Mesenchyme contains calcareous spicules and amoeboid cells such as trophocytes, thesocytes, collencytes and archeocytes. It is gelatinous in nature.


 * Choanoderm contains single layer of large flagellated collared cells (choanocytes) which also forms the lining of radial canals.


 * Water enters body through deermal ostia into the incurrent canal which are connected to radial canals by prosopyles.


 * Each radial canal opens into central spongocoel by an apopyle from where water exits through osculum.


 * Canal system is syconoid type.

Route of Water
Water (enters) ⇒ ostia ⇒ incurrent canal ⇒ radial canals through prosopyles ⇒ excurrent canal through apopyle ⇒ spongocoel through gastral ostium ⇒ leaves spongocoel by osculum.

=L.S. of Sycon =

Identifying Features

 * Body wall is diploblastic. It consists of pinacoderm and choanoderm enclosing mesenchyme in between.


 * Pinacoderm is made up of pinacocytes that covers the entire outer surface.


 * Mesenchyme is composed of various kinds of amoebocytes, gelatinous transparent matrix and spicules.


 * Choanoderm or gastral epithelium consists of single layer of flagellated collared cells known as choanocytes which also forms the lining of radial canals.


 * Spongocoel is lined by flat pinacocytes.



Route of Water
Water (enters) ⇒ ostia ⇒ incurrent canal ⇒ radial canals through prosopyles ⇒ excurrent canal through apopyle ⇒ spongocoel through gastral ostium ⇒ leaves spongocoel by osculum.