EPHYDATIA​

CLASSIFICATION OF EPHYDATIA​

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 :- Ephydatia

GEOGRAPHICAL DISTRIBUTION

  • Found in Vancouver Island, Eastern and Central States.

HABIT AND HABITAT

  • Ephydatia is a greyish or greenish fresh-water sponge, found in clear water in streams, rivers, ponds and lakes. It attaches itself over rocks, twigs, plants or seed stems and sticks.

EPHYDATIA

GENERAL CHARACTERSTICS OF EPHYDATIA​

  • Body of the animal consists of delicate chimney like tubes or finger like outgrowths.
  • At the end of each chimney lies an osculum.
  • Surface is perforated by several large oscula and large number of pores or ostia.
  • Scattered monaxon spicules are protective. Amphidisk spicules present. 
  • Food consists of organic particles, unicellular plants and infusorians.
  • Species growing in bright light acquire a greenish colour due to intracellular symbiotic Zoochlorellae
  • McNair found that stimuli applied at the oscular rim would be transmitted down the chimney, resulting in contraction or collapse of the latter. It shows sensory nature of the osculum.
  • Asexual reproduction by gemmules.
EPHYDATIA

IDENTIFICATION

  • The animal has pores, oscula, chimney like tube and all above features and hence it is Ephydatia.

EPHYDATIA
EPHYDATIA
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