CLASSIFICATION OF CLYPEASTER OR CAKE URCHIN​

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 :-ECHINOIDEA (Body oval or spherical and composed of test)

SUB-CLASS :- IRREGULARIA (Periproct displaced towards mouth in innerradius.)

ORDER :- CLYPEASTEROIDA (Body disk-shaped, ambulacra petaloid and anus displaced laterally.)

GENUS :- Clypeaster (cake urchin)

GEOGRAPHICAL DISTRIBUTION

  • It is found in tropical, sub-tropical region, Red Sea and North Carolina to Brazil.

HABIT AND HABITAT

  • Clypeaster is found creeping on the bottom or partly buried in sand. It shovels sand by its tube feet.

CLYPEASTER OR CAKE URCHIN​

GENERAL CHARACTERSTICS OF CLYPEASTER OR CAKE URCHIN​

  • Commonly called as cake urchin.
  • Body is flattened and is exhibiting bilateral symmetry. Test is more or less round in outline and is covered with thick and short spines. 
  • Body differentiated into oral and aboral surfaces.
  • Shell more or less five sided, each petaloid area being wide and well marked and each pair of ambulacral. 
  • Aboral surface is slightly convex. Aboral ends of 5 ambulacral areas are bordered, each by two rows of flattened, respiratory tube feet, which are arranged in such a way that they appear like petals of flowers and are hence called as petaloids. 
  • Madreporite is placed at the centre of the aboral side, from which radiate five petaloid ambulacral areas which are clearly seen. Between two petaloid is interambulacral area.
  • Oral surface is flat and covered by a dense velvety coat or short spines and pedicellariae. Mouth lies in centre and communicates with 5 simple groove along the centre of the ambulacral areas. Anus or periproct oral. Around mouth is 5 teeth of masticatory apparatus. Ambulacral groove is clearly seen. 
  • At the beginning of each ambulacral area near the peristome there exist two sphaeridia which are immovable and devoid of nerve ring. 
  • Genital plates are fused with the central pentagonal plate. Radial ocular plates are distinct. 
  • Development includes echinopluteus larva.
CLYPEASTER OR CAKE URCHIN​

IDENTIFICATION

  • The animal contains five distinct petaloid and all above features, hence it is Clypeaster.

CLYPEASTER OR CAKE URCHIN​
CLYPEASTER OR CAKE URCHIN​
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