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HALICHONDRIA​

CLASSIFICATION OF HALICHONDRIA​

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 :- Halichondria

GEOGRAPHICAL DISTRIBUTION

  • Cosmopolitan, specially found in Rhode Island to Arctic ocean, North Pacific-Europe.

HABIT AND HABITAT

  • Halichondria is a colonial form. In shallow water it forms low encrustations on rocks while in deep water it develops into extensive masses of various kinds.

HALICHONDRIA​

GENERAL CHARACTERSTICS OF HALICHONDRIA​

  • Commonly called as crumb of ‘bread sponge’.
  • Soft green, brown or yellow coloured. 
  • Oscula are placed at the top of conical projection of sponge. 
  • In encrusting kinds, each osculum communicates with the surface and body is vase-shaped. 
  • In encrusting kinds each osculum communicates with the surface.
  • Skeleton consists of irregularly scattered oxeas spicules of several sizes with little or no spongin.
HALICHONDRIA​

IDENTIFICATION

  • The animal has massive colony, irregularly scattered spicules vase-shaped body, oscula and all above characters, hence it is Halichondria.

HALICHONDRIA​
HALICHONDRIA
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