EDWARDSIA

CLASSIFICATION OF EDWARDSIA

KINGDOM :- ANIMALIA ( Multicellular eukaryotic organisms)

PHYLUM :- COELENTRATA OR CNIDARIA (Tissue grade, diploblastic and acoelomate. )

CLASS :- ANTHOZOA OR ACTINOZOA (Only polypoid generation. sedentary, solitary, colonial.)

SUB-CLASS :- HEXACORALLIA (Tentacles and mesenteries in multiple of five or six.)

ORDER :-  ACTINIARIA (Sea anemones, without skeleton with mesenteries of septa in multiple of six. Basal disc present.)

FAMILY :- EDWARDSIIDAE (Have long thin bodies and live buried in sediments or in holes or crevices in rock)

GENUS :- Edwardsia

GEOGRAPHICAL DISTRIBUTION

  • Found in U.S.A., Southern California and North of Cape Cod.

HABIT AND HABITAT

  • Edwardsia is a small, solitary, marine, hexacorallian coelenterate buried in sand with changeable positions.

EDWARDSIA

GENERAL CHARACTERSTICS OF EDWARDSIA

  • Body of the preserved specimen is cylindrical and divided into oral disc, column and physa.
  • Column is further differentiated into capitulum, scapulus and scapus. Alive animal appears shorter of contracted condition and retracted tentacles arround manubrium. 
  • Oral disc unexpanded contains 16 retractile tentacles. In contracted stage no tentacle is seen.
  • Body surface has 8 longitudinal ridges and the posterior half of the scapus contains rows of nematocysts called as nemathybomes.
  • Basal part or physa is demarcated by limbus from scapus. 
  • Siphonoglyphs and mesenteries eight in number are present. 
  • Septa are in primitive condition consisting of 8 macro septa and more than 4 microsepta.
EDWARDSIA

SPECIAL FEATURES

  • The young Edwardsia leads a parasitic life in the gastrovascular system of medusa and in ctenophores.

IDENTIFICATION

  • The animal contains retractile tentacles and physa, and all above characters, hence it is Edwardsia.

EDWARDSIA
EDWARDSIA
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