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

GEOGRAPHICAL DISTRIBUTION

  • It is found in shallow water on the Carolina coast and West Indies.

HABIT AND HABITAT

  • Renilla is marine, dimorphic, colonial and benthic.

RENILLA : SEA PANSY

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 :
    1.  Anthocodia or autozooids. They are nutritive in function and irregularly distributed on the dorsal surface
    2. 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.
RENILLA : SEA PANSY

IDENTIFICATION

  • The animal contains discoidal reniform body and all above characters, hence it is Renilla.

RENILLA : SEA PANSY
RENILLA : SEA PANSY
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