CLASSIFICATION OF SPONGILLA

PHYLUM :- PORIFERA (Pore bearing, cellular grade, asymmetrical or radially symmetrical.)

CLASS :- DEMOSPONGIAE (Skeleton of spongin fibres or siliceous spicules which are not six-rayed.)

ORDER :- Monaxonida (Spongin mayor may not be present; spicules monaxon.) 

GENUS :- Spongilla

GEOGRAPHICAL DISTRIBUTION

  • It is found in Atlantic, Europe and American waters.

HABIT AND HABITAT

  • Spongilla is a colonial sponge, abundantly found III ponds or streams.

SPONGILLA DIAGRAM, SPONGILLA STRUCTURE

GENERAL CHARACTERSTICS OF SPONGILLA

  • Commonly known as fresh-water sponge.
  • Colony is profusely branched, exhibiting various shades of green colour due to the presence of green algae, called as Zoochlorellae, in the cellular system.
  • Body wall consists of very thin dermal membrane, perforated with dermal pores or ostia and several oscula. 
  • Skeleton is composed of spongin fibres. The siliceous spicules are in the form of network of smooth or spiny large and small oxe!lS, embedded in the spongin.
  • Canal system is of the rhagon type. Water enters through dermal pores -> sub-> dermal cavity -> incurrent canals -> several flagellated chambers -> excurrent canal -> osculum. 
  • Asexual reproduction by gemmules. 
  • Sexual reproduction by sperm and ova.
  • Gemmules are protected by amphidisk spicules. 
  • Larva is free swimming. It develops on floating submerged twigs or sticks.
SPONGILLA

IDENTIFICATION

  • The animal has branched colony, ostia, rhagon type canal system and all above features and hence it is Spongilla.

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