CLASSIFICATION OF ECHINOCARDIUM

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 :-SPATANGOIDA 

GENUS :- Echinocardium (The heart urchin)

GEOGRAPHICAL DISTRIBUTION

  • Cosmopolitan :- It has world-wide distribution.

HABIT AND HABITAT

  • Echinocardium burrows in sand 10 to 15 cm deep and moves by spines. It lives in a small chamber, which opens to surface by a chimney, through which animal feeds by protruding tube feet.

ECHINOCARDIUM

GENERAL CHARACTERSTICS OF ECHINOCARDIUM

  • It shows extreme modification of echinoderm pattern as it becomes heart-shaped and is popularly known as heart urchin.
  • Test is large in size with four well-developed petaloids and aboral surface and anterior anJ posterior sides.
  • On oral surface long tubercles or long interambulacral spines are present.
  • Apical central plate contains gonopores. 
  • Peristome or mouth becomes transversely extended. 
  • Aristotle’s lantern is absent. 
  • Ambulacral areas bear short tube feet and short spines called ambulacral spines. 
  • Inter-ambulacral areas bear long spines. 
  • Development includes echinopluteus larva.
ECHINOCARDIUM

IDENTIFICATION

  • The animal contains 4-well developed petaloid and all above features, hence, it is Echinocardium.

ECHINOCARDIUM
ECHINOCARDIUM
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