CLASSIFICATION OF THYONE

PHYLUM :- ECHINODERMATA (Coelomate, pentaradiate and spiny skinned animals with vascular system.)

SUB-PHYLUM :- ELEUTHEROZOA (Non-pedicellate and free-living.)

CLASS :- HOLOTHUROIDEA (Body orally and aborally elongated.)

ORDER :- DENDROCHIROTA (Oral tentacles tree-like – dendroid.)

GENUS :- Thyone

GEOGRAPHICAL DISTRIBUTION

  • It is found in U.S.A. (Vineyard Sound and Southwards).

HABIT AND HABITAT

  • Thyone is a marine and burrowing animal in shallow waters. It is found buried in muddy and sandy bottoms.

THYONE

GENERAL CHARACTERSTICS OF THYONE

  • Commonly called as sea cucumber. 
  • Body is ovate or elongated. 
  • Oral end contains a large mouth, surrounded by 10 dendritic oral tentacles, which can be considerably extended. Tentacular region is followed by introvert. 
  • Colour may be dull brown or black or red above and whitish below.
  • Body divided into ambulacral and interambulacral area.
  • Tube feet are distributed over the entire body surface without definite arrangement in the ambulacral region. 
  • Respiratory trees present but cuvierian tubes absent. 
  • Haemal system simple. Haemocytes in the coelomic fluid contain haemoglobin. Stomach in the form of muscular sac. 
  • Water vascular system is present. Sexes are separate. Development includes Auricularia larva.
THYONE

IDENTIFICATION

  • The animal contains small locomotory podia and all above features, hence it is Thyone.

THYONE
THYONE
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