CLASSIFICATION OF OPHIODERMA (BRITTLE STAR)​

KINGDOM :- ANIMALIA (Multicellular eukaryotic organisms)

PHYLUM :- ECHINODERMATA (Coelomate, pentaradiate and spiny skinned animals with vascular system.)

SUB-PHYLUM :- ELEUTHEROZOA (Non-pedicellate and free-living.)

CLASS :- OPHIUROIDEA (Central disc and arms distinct.)

ORDER :- OPHIURIDA (Arms bent only to lateral sides.)

FAMILY :- OPHIODERMATIDAE (family of brittle stars)

GENUS :- Ophioderma (The brittle star)

GEOGRAPHICAL DISTRIBUTION

  • It is found along the North Atlantic Mediterranean littoral, tropical and West Indian seas.

HABIT AND HABITAT

  • Exclusively marine.

OPHIODERMA (BRITTLE STAR)​

GENERAL CHARACTERSTICS OF OPHIODERMA (BRITTLE STAR)​

  • Commonly called as brittle star.
  • Body consists of a small pentagonal disc set by closely set granules. Oral papillae numerous and arranged in a continuous series.
  • Body is differentiated into oral and aboral surfaces with distinct central disc and five surpentine arms. 
  • Arms are covered by arm shields or calcareous ossicles and small spines.
  • The oral surface has star-shaped mouth fringed with oral papillae. 
  • Skin covers the disc which is composed calcareous plates in the disc and typically of articulating ossicles in the arms.
  • Internal structures are restricted to central disc only.
  • Anus and pedicellariae absent.
  • Madreporite is oral. The ambulacral grooves are usually covered. Tube feet lack suckers. 
  • Most important individual characteristic feature of the genus is the presence of two slits in each bursa, one situated orally and the other peripherally. Larva is Ophiopluteus.
OPHIODERMA (BRITTLE STAR)​

IDENTIFICATION

  • The animal contains distinct rounded disk, serpentine arms with spine and all above features hence it is Ophioderma.

OPHIODERMA (BRITTLE STAR)​
OPHIODERMA (BRITTLE STAR)​
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