STYLASTER

CLASSIFICATION OF STYLASTER

PHYLUM :- COELENTRATA (Tissue grade, diploblastic and acoelomate. )

CLASS :-  HYDROZOA  (Coenosarc secretes exoskeleton and polyps dimorphic. )

ORDER :- HYDROCORALLINA (Coenosarc secretes exoskeleton and polyps dimorphic.)

SUB-ORDER :- . STYLASTERINA (Polyps arranged in systems.)

GENUS :- Stylaster

GEOGRAPHICAL DISTRIBUTION

Styiaster is found in tropical and sub-tropical regions.

HABIT AND HABITAT

It is marine and colonical.

STYLASTER

GENERAL CHARACTERSTICS OF STYLASTER

  • Colony consists of upright calcareous pink coloured tree like branches.
  • Surface of the body bears gastropores and dactylopores, arranged in a cyclic manner.
  • Branches of the colony are provided with cup-like projections with radiating septa.
  • Centre of each cup contains tentacle-bearing gastrozooid, surrounded by tentacleless dactylozooids. Gastrozooids are short and stout bearing few solid short projections. Dactylozooids are simple and hollow finger-line projection without tentacles arising from peripheral compartments.
  • Cups rest on calcareous projection called as style and hence the name Stylaster. Style in a pointed calcareous projection present at the base of each cup.
  • Cups are wihtout tabulate and rest on a calcareous projection called as style and hence the name stylaster. 
  • Medusae degenerate, forming sporosacs, lying inside the chambers of coral called ampUllae.
  • Young ones escape in planula stage.
STYLASTER

IDENTIFICATION

The specimen has upright branches with cup like projection and all above characters, hence it is Stylaster.

STYLASTER
STYLASTER
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