bony fish class

Nails and hair are also exoskeleton found in our body. Their head and thorax were covered by articulated armoured plates and the rest of the body was scaled or naked depending on the species.

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Fish Scales If you have ever been to a fish market or caught your own fish you will be aware that fish have scales.

. The backbone has. Therefore researchers interested in determining a fish age look. Rays are further distinguished from sharks by their greatly enlarged winglike. Fish scales are the small almost plastic.

Thus it forms a hollow bony tube. Body Movements Class 6 Extra Questions Science Chapter 8. Rays are distinguished from sharks by a flattened disklike body with the five gill openings and the mouth generally located on the underside. The main nerve cord passes through it.

However there are variations in size at any particular age for most fish species making it difficult to estimate one from the other with precision. Size is generally associated with age. The order includes 534 species. Ray any of the cartilaginous fishes of the order Batoidei related to sharks and placed with them in the class Chondrichthyes.

Contents1 Fish Scales11 Placoid Scales12 Do Sharks Have Scales13 Cosmoid and Ganoid Scales14 Elasmoid Ctenoid and Cycloid Scales15 Do All Fish Have Scales16 Fish Scale Evolution17 What Next. Similarly the scales of cockroach fish outer shell of snails and oyster are also exoskeleton of these animals. Knowledge of fish age characteristics is necessary for stock assessments and to develop management or conservation plans. Placodermi from the Greek πλάξ plate and δέρμα skin literally plate-skinned is a class of armoured prehistoric fish known from fossils which lived from the Silurian to the end of the Devonian period.