CLASSIFICATION OF LUIDIA

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 :-PAXILLOSIDA (adults lack an anus and have no suckers on their tube feet.)

FAMILY :-  LUIDIIDAE

GENUS :- Luidia (The seven armed starfish)

GEOGRAPHICAL DISTRIBUTION

  • It is found in Atlantic; Pacific coast from Alaska to Mexico; Florida; West Indies and West coast of Africa.

HABIT AND HABITAT

  • Luidia is a tropical and sub-tropical asteroid echinoderm commonly present below low-water mark to 190 fathoms

LUIDIA (SEVEN ARM STARFISH)

GENERAL CHARACTERSTICS OF LUIDIA​

  • Commonly called as star-fish.
  • Animal consists of a comparatively small, central disc and 5 to 11 elongated, flexible and cylindrical arms.
  • Body differentiated into oral and aboral surfaces. 
  • Arms are bordered with spiny fringe. 
  • Oral surface contains a central mouth with communicates with ambulacral grooves in each arm. 
  • Marginal plates on margin.
  • Infra-marginal plate is separated from the ambulacral plate by a small intermediate plate. 
  • Aboral surface is made up of several small rectangular ossic1es. This surface is marked by coloured patches.
  • Pedicellariae are generally found.
  • The gills are branched.
  • Anus and intestinal caeca are absent.
LUIDIA (SEVEN ARM STARFISH)

SPECIAL FEATURES

  • Luidia have seven arms.
  • A polynoid polychete (Achloe astericola) is found as commensal in the ambulacral groove of Luidia.

IDENTIFICATION

  • The animal contains comparatively short central disc, long flexible arms and all above features hence it is Luidia.

LUIDIA (SEVEN ARM STARFISH)
LUIDIA (SEVEN ARM STARFISH)
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