CLASSIFICATION OF OPHIOCOMA

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 :- Ophiocoma

GEOGRAPHICAL DISTRIBUTION

  • It is found along the Red Sea shores. West Indian regions and Florida.

HABIT AND HABITAT

  • Ophiocoma is commonly found in shallow waters.

OPHIOCOMA

GENERAL CHARACTERSTICS OF OPHIOCOMA

  • Commonly called as brittle star. 
  • Body consists of a small, rounded central disc and 5 long slender, tapering arms, which are inserted on the under-surfaces of the disc. 
  • Central disk and arms quite distinct. 
  • Arms are distinctly marked off from the central disc and do not have prolongations of perivisceral coelom and alimentation.
  • Oral and aboral surfaces are distinctly marked.
  • Oral surface has leathery skin. Anus and pedicellariae absent. 
  • Oral surface has a central, pentagonal mouth opening and indistinct inter-radial oral madreporite. The ambulacral grooves covered.
  • There are 10 elongated slits, two on either side of the base of each arm, called as genital bursae in which gonoducts open. 
  • Three rows of pointed spines are borne on lateral plates. Single row of short tube feet projects on each side between lower and lateral plates. Ossicles of arms are articulating.
OPHIOCOMA

IDENTIFICATION

  • The animal contains three rows of pointed spines and all above features, hence it is Ophiocoma.

OPHIOCOMA
OPHIOCOMA
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