Explain the important features of super class Pisces.
Answers
(i.) Habitat: These are aquatic animals and are present in fresh, marine and brackish waters.
(ii.) Body temperature: Pisces are poikilothermic animals i.e., cold blooded animals, in which body
temperature changes according to the change in the surrounding temperature.
(iii.) Food: These animals feed on detritus material, planktons, algae, some feed on molluscs and other aquatic organisms.
(iv.) Locomotion: Locomotion is by body muscles and fins. Caudal fin help in steering.
(v.) Exoskeleton: Exoskeleton is made up of dermal scales. Endoskeleton is either bony or cartilagenous.
(vi.) Body shape: Body is streamlined and boat-shaped and helps to overcome resistance during swimming.
(vii.) Mouth: Mouth is terminal or ventral in position.
(viii.) Respiration: Respiration is by gills.
(ix) Circulation: It shows a single closed circulation. Blood cells are present and blood is red in colour. Heart is two-chambered and ventral in position.
(x) Nervous system: They have a well developed brain with large olfactory lobes.
(xi.) Reproduction:Sexes are separate. Most of the fishes are oviparous, however some are viviparous.
(xii.) Superclass Pisces is further divided into two classes:
- a. Class: Chondrichthyes: e.g. Scoliodon, Electric ray, Sting ray.
- b. Class: Osteichthyes: e.g. Pomphret, Labeo, Catla, Bombay duck, Lung fish, etc.
Answer:
your answer
Explanation:
They are the first jawed vertebrates and the study of fish is called Ichthyology. Fish are cold blooded animals (poikilothermic). ... Their body is spindle shaped or streamlined to enable them to move rapidly in water.