The upcoming discussion will update you about the differences between Cartilaginous and Bony Fishes. Difference # Cartilaginous Fishes: 1. Cartilaginous fishes are mostly marine. 2. The mouth of cartilaginous fishes is ventral. 3. The external nares are ventral. 4. The scales of cartilaginous fishes are Placoid. 5. In cartilaginous fishes, operculum is absent except chimaera. 6. Caudal fins are heterocercal [...]
In this article we will discuss about:- 1. General Characteristic of Class Aves 2. Flight Adaptations in Class Aves 3. Classifications. General Characteristics of Class Aves: Some of the general characters of class Aves the birds are listed below: 1. Birds are bipedal feathered and warm blooded (homoiothermous) animals i.e., they are able to maintain a constant body temperature. Their [...]
In this article we will discuss about the Characters and Classification of Chordates. Characters of Chordates: All the chordates possess four diagnostic characters either in the embryonic or adult stage. 1. Notochord: It is a solid un-jointed, stiff but flexible rod-like structure situÂated on the dorsal side between the dorsal hollow nerve cord and the alimentary canal. 2. Dorsal Hollow [...]