CLASSIFICATION OF PENTACEROS (SEA PENTAGON)​

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 :- ASTEROIDEA (Central disc and arms fused.)

ORDER :- PHANEROZONIA (Marginal plates distinct.)

GENUS :- Pentaceros

GEOGRAPHICAL DISTRIBUTION

  • It is found in U. K., U.S.A., India, Panama and South America.

HABIT AND HABITAT

  • Pentaceros is the most common eleutherozoan echinoderm found in sea from shallow water to 1,000 fathoms.

PENTACEROS (SEA PENTAGON)​

GENERAL CHARACTERSTICS OF PENTACEROS (SEA PENTAGON)​

  • Commonly called as sea pentagon or starfish. 
  • Body is enclosed in a tough, hard and leathery integument containing several ossicles.
  • Central disc and the arms are fused together. Arms contain extension of gonad, coelom and the gut. 
  • Arms are 5 in number and symmetrically arranged in the form of star around the central disc. Body is differentiated into oral and aboral surfaces.
  • Aboral surface is brown and convex, containing rows of definitely arranged spines. The marginal plates are large and distinct. 
  • There is a rounded sieve plate or madreporite plate in one of the inter-radii. It forms the first part of the water vascular system which is well developed.
  • Oral surface is concave, dark brown, having a centrally-placed mouth or actinostome. Mouth is 5-angled and each angle is continued into the ambulacral groove up to the tip of an arm. 
  • Ambulacral groove contain double rows of locomotory organs of tube foot.
  • Sexes are separate. Development indirect which includes bipinnaria larva. 
  • Pentaceros is the most familiar seashore animals.
PENTACEROS (SEA PENTAGON)​

IDENTIFICATION

  • The animal contains leathery surface and all above features, hence, it is Pentaceros.

PENTACEROS (SEA PENTAGON)​
PENTACEROS (SEA PENTAGON)​
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