What is interesting about the bony fish?
They have a central axis of bone that acts as a unique skeletal support for fins and limbs, and their upper jaws are fused with their skulls. Two major groups of fishes fit under the Sarcopterygii: the Ceratodontiformes (or lungfishes) and the Coelacanthiformes (or coelacanths), once thought to be extinct.
How old is the bony fish?
about 425 million years old
The oldest known fossils of bony fish are about 425 million years old, which are also transitional fossils, showing a tooth pattern that is in between the tooth rows of sharks and bony fishes.
What are bony fish made of?
The skeleton of bony fishes is made of bone and cartilage. The vertebral column, cranium, jaw, ribs, and intramuscular bones make up a bony fish’s skeleton.
What are the 2 types of bony fish?
The bony fish are divided into two classes: ray-finned fish and lobe-finned fish. The bony fish are characterized by a lung or swim bladder, a cover over the gills, and bones covering the head and pectoral girdles.
Do bony fish have hair?
They have a bony endoskeleton with a backbone and jaws; they breathe only with lungs; they have four limbs; their skin is covered with hair or fur; they have amniotic eggs; they have mammary (milk- produc ing) glands; they are endothermic.
What do bony fish eat?
Some of the animals common in the diets of bony fishes include: annelid worms, marine snails, mussels, clams, squids, crustaceans, insects, birds, amphibians, small mammals, and other fishes.
Do bony fish have jaws?
The bony fish differ from the Agnatha because they have jaws.
Do bony fish have lungs?
Bony fish have lungs which have in many types evolved into a buoyancy aid the swim-bladder. It seems that early stages of bony fish evolution occurred in fresh water where the lung was used for respiration. The lung gradually evolved into a swim-bladder containing gases for buoyancy.
How do bony fish effect humans?
Structure and function. How gas is pumped into the swim bladder using counter-current exchange.
What are the general characteristics of bony fishes?
– Some bony fishes have soft, flexible fin rays. – Other bony fishes have spiny, rigid fin rays at the leading edges of the dorsal, anal, and pelvic fins. – Both soft and spiny fin rays are modified scales. – The spiny fin rays of some species are associated with venom glands.
What is the most common type of bony fish?
Tuna.
Why do bony fish have many gill filaments?
Why do fish have so many gill filaments? Actively swimming fish have gill filaments that are highly developed to maximize the absorption of oxygen. Sedentary fish that live on the bottom usually have gill filaments that absorb smaller volumes, since they are less active and don’t use the oxygen as quickly.