CLASSIFICATION OF RENILLA : SEA PANSY
PHYLUM :- COELENTRATA OR CNIDARIA (Tissue grade, diploblastic and acoelomate. )
CLASS :- ANTHOZOA OR ACTINOZOA (Only polypoid generation. sedentary, solitary, colonial.)
SUB-CLASS :- OCTOCORALLIA (Polyps with 8 tentacles, bioluminescent.)
ORDER :- PENNATULACEA (Colony dimorphic with a long axial polyp and many lateral polyps.)
FAMILY :- RENILLIDAE
GENUS :- Renilla
It is found in shallow water on the Carolina coast and West Indies.
HABIT AND HABITAT
Renilla is marine, dimorphic, colonial and benthic.
GENERAL CHARACTERSTICS OF RENILLA : SEA PANSY
- Commonly called as Sea pansy.
- Colony consists of a short peduncle or stalk embedded in the mud and a discoidal, kidney shaped or reniform body measuring 4 to 8 cm in diameter.
- Body divided into dorsal and ventral surfaces.
- Pink or violet dorsal surface contains several whitish zooids or polyps.
- Broad ventral and median rachis are devoid of polyps.
- There are 2 kinds of zooids :
- Anthocodia or autozooids. They are nutritive in function and irregularly distributed on the dorsal surface
- Siphonozooids are arranged in clusters and maintain water current in the colony.
- Peduncle contains tubes for water current.
- Axial skeleton is completely absent.
- A median track devoid of polyps extends from the peduncle up to the middle of the rachis, where it terminates as a special exhalent siphonozooid.
The animal contains discoidal reniform body and all above characters, hence it is Renilla.