CLASSIFICATION OF SEPIA (CUTTLE FISH)
KINGDOM :- ANIMALIA (Multicellular eukaryotic organisms)
PHYLUM :- MOLLUSCA (Unsegmented bilaterally symmetrical and provided with visceral mass, foot and mantle.)
CLASS :- CEPHALOPODA (Head well developed with eyes and radula. Foot represented by arms and tentacles.)
SUB-CLASS :- DIBRANCHIA (Gills, kidneys and hearts, two each)
ORDER :- SEPIIDA OR DECAPODA (Shell internal; 8 short and 2 long tentacles.)
FAMILY :- SEPIIDAE
GENUS :- Sepia (Cuttle fish)
It has cosmopolitan distribution but specially found in India, Europe and Mediterranean region.
HABIT AND HABITAT
Sepia is also a marine cephalopod, found along with Loligo in coastal waters in coral reefs. It is a good swimmer. It usually swims at night and rest flat at the bottom during daytime. It can also burrow by using fins as shovels. It is carnivorous, living on small fishes, crustaceans and other animals. Shallow to mid water forms.
GENERAL CHARACTERSTICS OF SEPIA (CUTTLE FISH)
- Commonly called as cuttle fish.
- Body is fleshy and differentiated into anterior head, middle collar and posterior trunk or visceral hump.
- Colour is brownish with white spots stripes with violet fins. Chromatophores are present in the deeper layers of integument hence it gives a pigmented appearance.
- Head contains 10 oral arms. 8 oral arms are smaller and have several rows of pedicellate suckers ventrally encircling around mouth. 2 arms on each side are elongated, each having several pedicellate suckers at its tip and are called as hectocotylised arms for capture of prey.
- At the base of head is a pair of eyes without olfactory crest.
- Sepia is luminescent and dibranchiate. It is also a myopsidan mollusc, having imperforated cornea and single oviduct.
- Internal chambered calcareous shell is well developed and is flat. Shell is used in the maintenance of neutral buoyancy.
- Chromatophores are present in the deeper layers of the integument and hence it gives a pigmented appearance.
- Sexes are separate.
Animal ejects ink by its ink gland in sea water when irritated. Ink is secreted from a pear-shaped ink sac lying over postero-ventral surface. Ink is called as Sepia ink which acts as defense mechanism for enemies.
- It is used for food in the Mediterranean countries and the sepia ink has medicinal value.
The animal contains lateral fin all around the visceral hump and all above features, hence it is Sepia.
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