Examples: Cladoselache, Cladodus, Symmorium, Diademonus, etc. The Chondrichthyes are a class of fish that have a skeleton made up of cartilage rather than bones. They became extinct at the end of Palaeozoic era. The anterior margin of the pectoral fin is free from the body. The nostril one or two, never open in the mouth cavity. Chondrichthyes characteristics include a cartilaginous skeleton, lack of a swim bladder, lipid storage restricted to the liver, unique hematopoietic organs, and bacteremia in clinically normal individuals. 3. It includes sharks, rays and Chimaeras. Characteristics of Chondrichthyes Chondrichthyes share many common characteristics among each other; their main defining feature is having a cartilaginous skeleton. Their main features are: The body is fusiform. Examples: Pristis, Raja, Rhinobatos, Tor­pedo, Dasyatis, Aetobatus, Manta, etc. Gaseous exchange occurs through the water current that passes over the gills. The main characteristics of chondrichthyans fish include jaws, paired fins, paired nostrils, placoid scales, and two-chambered hearts. 2. 2. They have a four-chambered heart. Examples: Chimaera, Callorhynchus, Harriotta, etc.. There are just under 1000 living species, all of which have … Osteichthyes is divided into two subclasses- Sarcopterygii and Actinopterygii. Fish is in the class of Chondrichthyes with frames made of sinew and has skates, sharks, and rays. The class Chondrichthyes consists of the cartilaginous fishes, including sharks, batoids (rays, skates, guitarfish, and sawfishes), and chimaeras, or ratfishes. All birds fall in this category. No paired appendages (jointed parts, i.e. Nelson. Some of them possess electric organs or poison sting, which are used for defence as well as predation. Most sharks and rays fertilize their eggs. … This type of skeleton is strong and is more flexible and lighter than a bony skeleton. General characteristics of all fishes (class Agnatha, class Chondrichthyes, class Osteichthyes) Gills “Water breathing” through gills which are modified pharyngeal slits. The first dorsal fin is far forward with strong spine. Chondrichthyan - Chondrichthyan - Form and function: The elasmobranchs are fishlike vertebrates that differ from bony fishes in many respects. 1. Class Chondrichthyes. Neither skull nor jaw are attached to hyoid arch. Cartilaginous skeletons No swim bladder. The skeleton is composed of cartilage and, although often calcified (especially in the vertebrae), lacks true bone (except in the roots of teeth). They have streamlined body with cartilaginous endoskeleton. The class includes a diverse group of fishes including sharks, rays, skates and chimaeras. The Chondrichthyes well-developed jaws, highly developed sense organs, powerful swimming ability and streamlined shape have enabled them to thrive as marine predators for more than 350 million years, as other groups have come and gone. 2. Eggs large and yolky. Content Guidelines 2. Modern Chondricthyes include the sharks, rays and Chimeras. and Rajiformes(Rays) Characteristics of the Class Chondrichthyes ... Start your search on Class: Chondrichthyes. The largest shark is the _____, which eats _____. Chimaeras (in the sub-group Holocephali), are predominantly a lesser known group associated with deepwater. The dentition is highly peculiar in the composition of the tooth plates as well as in the shape. Class – Aves. Some species have electric organs such as Torpedo and some bear poisonous sting such as Trygon. Their teeth are larger versions of these scales. fins). They are predatory fishes, they feed on other fishes, crustaceans and molluscs. The head and pectoral girdles are covered with large dermal bones. The halves of the pectoral girdle ei­ther fuse with each other or else both fuse to the vertebral column. Most Chondrichthyes exhibit a massive growth with up to 21.5 tonnes in weight (whale shark). 2. 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