CLASSIFICATION OF SEA CUCUMBER OR CUCUMARIA​

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 :- Cucumaria (The sea cucumber)

GEOGRAPHICAL DISTRIBUTION

  • It has cosmopolitan distribution and specially found in Europe, U.S.A. and India.

HABIT AND HABITAT

  • Cucumaria is inhabits approximately 200 fathoms deep wholly or partially buried in the mud. It feeds on detritus and plankton.

SEA CUCUMBER OR CUCUMARIA​ ​

GENERAL CHARACTERSTICS OF SEA CUCUMBER OR CUCUMARIA​

  • Commonly called as sea cucumber. 
  • Body is elongated horizontally along the oral aboral axis. Colour of the body may be whitish, reddish or brown. 
  • Oral end contains a whorl of 10 dendritic bushy, pinnately branched tentacles surrounding the terminal month. Tentacles are modified tube feet. 
  • Anterior region is called as collar which contains mouth at anterior extremity. 
  • Rest of the body differentiated into 5 ambulacral and 5 inter ambulacral zones. Ambulacral grooves are covered and run longitudinally.
  • Tube feet, when present, usually possess suckers and are either arranged in rows or are irregularly scattered. 
  • Body wall which is dermo-muscular contains very small separate ossicles. 
  • There is a single genital aperture, middorsally situated between the bases of two adjacent inter-ambulacral tentacles near mouth. 
  • Animal rests on the so-called ventral surface, which is flattened and paralleled with oral aboral axis of the body, and is pentaradiate. It has 3 ambulacral areas trivium and forms sole. Dorsal surface with 2 ambulacral areas is called as bivium. Anus is aboral with paired respiratory trees. 
  • Larva are Auricularia Doliolaria.
SEA CUCUMBER OR CUCUMARIA​ ​

IDENTIFICATION

  • The animal contains whorl of pinnately branched tentacles and all above features, hence it is Cucumaria.

SEA CUCUMBER OR CUCUMARIA​ ​
SEA CUCUMBER OR CUCUMARIA​ ​
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