CLASSIFICATION OF OPHIOTHRIX

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 :- AMPHIURIDAE (Their jaws are always with two apical papillae at the tip, and one or more papillae on each side)

GENUS :- Ophiothrix

GEOGRAPHICAL DISTRIBUTION

  • Cosmopolitan.

HABIT AND HABITAT

  • Ophiothrix is found in sea shore and in shallow warers. It is microphagus feeding on microbes.

OPHIOTHRIX

GENERAL CHARACTERSTICS OF OPHIOTHRIX

  • Commonly called as Brittle star. 
  • Ophiothrix reveals considerable variation in spine armature and colour pattern. No two individuals are alike. 
  • Body divisible into oral and aboral surfaces. Central disc and arms quite distinct. 
  • Spines on the disc continue round its sites, lateral spines are larger in size. Interradially and on edges of oral surfaces.
  • Aboral surface has radial shields in central disc. 
  • Mouth in oral surface has complicated system of plates, spines and tube feet. Inter-radially buccal shields are present and beneath on lateral position are lateral buccal shield. Around mouth are jaw. 
  • At the base of each arm are slit like Bursal slit. 
  • Oral surface reveals each arm is made up of vertebral consisting of lateral plates and ventral plate. Lateral spines, tube foot, jaw and tentacle scale are seen.
  • Aboral surface contains dorsal plates.
OPHIOTHRIX

IDENTIFICATION

  • The animal contains radial shields in aboral surface and all above features hence it is Ophiothrix.

OPHIOTHRIX
OPHIOTHRIX
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