Question

Mention the features of class Osteichthyes.

Answer 1

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Answer...

• These are also known as bony fishes due to the presence of bony endoskeleton.

• Operculum is present.

• Skin is covered by cycloid/ ctenoid scales .

• Air bladder is present and helps in regulating buoyancy.

• These are cold blooded animals.

Ex → Exocoetus , Labeo , etc.

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Answer 2

the features of Osteichthyes are....

1. These refers to the bony fishes in opposite to the other cartlilaginuous fishes.
2. this is the largest class of vertibrtes till now.
3. Bony fish are characterized by a relatively stable pattern of cranial bones, rooted, medial insertion of mandibular muscle in the lower jaw. The head and pectoral girdles are covered with large dermal bones. The eyeball is supported by a sclerotic ring of four small bones, but this characteristic has been lost or modified in many modern species. The labyrinth in the inner ear contains large otoliths. The braincase, or neurocranium, is frequently divided into anterior and posterior sections divided by a fissure.

Early bony fish had simple lungs (a pouch on either side of the esophagus) which helped them breathe in low-oxygen water. In many bony fish these have evolved into swim bladders, which help the body create a neutral balance between sinking and floating. (The lungs of amphibians, reptiles, birds, and mammals were inherited from their bony fish ancestors.) They do not have fin spines, but instead support the fin with lepidotrichia (bone fin rays). They also have an operculum, which helps them breathe without having to swim.

Bony fish have no placoid scales. Mucus glands coat the body. Most have smooth and overlapping ganoid, cycloid or ctenoid scales.

hope it helps you....