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
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.
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.
The young Edwardsia leads a parasitic life in the gastrovascular system of medusa and in ctenophores.
The animal contains retractile tentacles and physa, and all above characters, hence it is Edwardsia.