CLASSIFICATION OF ASTRANGIA

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 :-  SCLERACTINIA (Stony corals with compact calcareous exoskeleton.)

FAMILY :- RHIZANGIIDAE (Non-reef building corals and reproduce from stolons)

GENUS :- Astrangia

GEOGRAPHICAL DISTRIBUTION

  • It is found along the coasts of America, Atlantic coasts from North Carolina to North Massachusetts.

HABIT AND HABITAT

  • Astrangia forms small, encrusting colonies, measuring 5 or 8 cm in diameter on rocks and shells in sheltered places.

ASTRANGIA

GENERAL CHARACTERSTICS OF ASTRANGIA

  • Colony consists of closely placed thecae and protruding polyps. 
  • Polyps (zooids) of the colony are distinct and separated by sclerasepta from theca skeleton of the colony. 
  • Polyps are usually white, pinkish or greenish and remain expanded during day. 
  • Oral disc contains mouth, which is surrounded by a double ring of tentacles which are covered with nematocyst warts and tipped with a nematocyst knob.
  • Large polyps have three cycles of tentacles mostly 12 larger tentacles alternating with 12 smaller ones. 
  • Astrangia donae feeds on crustaceans, small fish, and bits of meat. 
  • Zooxanthellae are absent in the gastroderrnis of the polyps.
ASTRANGIA

IDENTIFICATION

  • The colony consists of closely placed thecae, protruding polyps and all above characters, hence it is Astrangia.

ASTRANGIA
ASTRANGIA
OUR POSTS

Leave a Comment

Your email address will not be published. Required fields are marked *